Senior Backend Engineer, Platform

Monzo Bank Ltd is seeking a Principal Backend Engineer to drive the design and development of scalable systems for its banking platform. This role plays a key part in shaping the technical direction of Monzo’s backend, ensuring that solutions are reliable and meet high standards of quality. Key responsibilities Lead the design and implementation of backend systems that power Monzo’s platform Establish and uphold coding and architectural standards across engineering teams Mentor engineers and support their growth in delivering maintainable solutions Champion best practices in software development and system design Technical leadership The Principal Backend Engineer will provide guidance to teams, influencing both immediate projects and long-term engineering strategy. Setting high standards and promoting effective practices are central to this position. Location This role is open to candidates based in Cardiff, London, or working remotely within the UK.

The Role:We are on the lookout for exceptionally skilled and motivated software engineers who take great pride in their craft to join our dynamic Engineering team in London. The successful candidates will collaborate within a cross-functional team that includes product managers and designers, working closely with various departments to deliver high-quality code that addresses real-world challenges for both our internal and external clients. You will take responsibility for the services managed by your team, ensuring their development aligns with AlphaSights' overarching engineering strategy while also mentoring junior engineers. If you have a fervent passion for coding and wish to collaborate with outstanding colleagues in a high-achieving environment, this position is perfect for you.What You’ll Do:Design Solutions: Craft the optimal technical solutions to meet business needs, contributing to an architectural vision that aspires to be the world's preeminent research platform.Ship Working Code: Our primary technology stack includes React for the frontend and Kotlin microservices with Postgres on the backend, along with some legacy services developed in Ruby on Rails. We are always exploring new technologies to enhance our stack.Deploy and Iterate: We frequently release updates to our customers, utilizing CircleCI and Spinnaker for CI/CD, and promptly gather feedback to inform our subsequent iterations.Build Your Competency: You will rapidly enhance your skills by developing industry-leading technology alongside seasoned professionals in a high-performance setting. Engineers can also leverage our learning and development budget to accelerate their technical skillset.Maintenance and Troubleshooting: Vigilantly monitor our services, addressing issues before they impact users, diagnosing root causes, and implementing fixes.

Join Our Vision! At Uncapped, we empower ambitious founders to scale their businesses through innovative financing solutions. We champion curiosity, continuous improvement, and impactful problem-solving.Technologies You Will Work With Core Technologies: Java 21, Spring Boot/Cloud 3.3Infrastructure: GCP, KubernetesDatabase Technologies: SQL/NoSQL (chosen per use case)Your Contributions Design and develop secure microservices tailored for financial systems.Take ownership of services throughout their lifecycle (design → deploy → monitor).Enhance code quality through automation and modern practices (CI/CD pipelines in under 15 minutes).Stay at the forefront of technology and share your insights with the team.Excel within a Kanban-driven team that values effective communication over meetings.Why Choose Uncapped?Be part of a fintech solution trusted by thousands of businesses.Contribute to a product that you can help shape and significantly impact.Supported by leading venture capitalists like LakeStar and SeedCamp.

Location: London Start date: Immediate The Role: We are seeking exceptionally skilled and motivated software engineers who take pride in their craft to enhance our Engineering team based in London. As a successful candidate, you will collaborate within a cross-functional team that includes product managers and designers, working closely with the wider business to deliver effective code that addresses real-world challenges for both internal and external clients. You will take charge of the services overseen by your team, ensuring their development aligns with the overarching AlphaSights Engineering strategy, while also mentoring junior engineers. If you are passionate about problem-solving through coding and aspire to work alongside outstanding colleagues in a high-achievement environment, this position is ideal for you. What You’ll Do: Design Solutions: Define optimal technical solutions to business problems, contributing to a scalable architectural vision that aims to become the world's leading research platform. Ship Working Code: Our primary tech stack consists of React for the frontend and Kotlin microservices with Postgres for the backend, alongside some legacy services built in Ruby on Rails. We continually assess new technologies that could enhance our stack. Deploy and Iterate: We release updates frequently to our customers, utilizing CircleCI and Spinnaker for CI/CD, gathering feedback promptly to inform subsequent iterations. Build Your Competency: You will rapidly advance your skills by developing market-leading technology alongside experienced colleagues in a high-performance environment. Engineers can also utilize our L&D budget to accelerate their development of specific technical competencies. Maintenance and Troubleshooting: Diligently monitor our services to catch errors proactively, diagnose root causes, and deploy fixes before users are affected. Who You Are: You likely hold a degree in a STEM subject, but we are also open to candidates who have honed their skills through alternative pathways. Experience: Proven experience at a similar level within a mature Engineering team, with aspirations to elevate your career. We seek individuals with outstanding potential. Technical Expertise: Extensive knowledge in frontend engineering, including designing, building, and maintaining robust web applications.

The Role: We are seeking exceptionally talented and motivated software engineers who take pride in their craft to join our Engineering team based in London. Successful candidates will become an integral part of a cross-functional team comprising product managers and designers, collaborating closely with the entire organization to produce effective code that addresses real-world challenges for both internal and external clients. You will have ownership of the issues that your team tackles, maintaining a high standard of quality in all releases while working within a top-performing international development environment. If you are passionate about solving problems with code and aspire to work alongside exceptional colleagues in a high-achieving atmosphere, this opportunity is perfect for you. What You Will Do: Design Solutions: Identify optimal technical solutions to business challenges, contributing to an architectural vision aimed at establishing the world's leading research platform. Ship Working Code: Our primary tech stack includes React for frontend development and Kotlin microservices with Postgres for backend, alongside some legacy services in Ruby on Rails. We maintain a proactive stance on evaluating new technologies that could enhance our stack. Deploy and Iterate: We frequently deploy to our customers, utilizing CircleCI and Spinnaker for CI/CD, and rapidly gather feedback to guide our next iterations. Build Your Competency: You will quickly learn by developing market-leading technology alongside experienced colleagues in a high-performance environment. Engineers have access to our L&D budget for the accelerated development of specific technical skills. Maintenance and Troubleshooting: Vigilantly monitor our services, identifying errors before they impact users, diagnosing root causes, and deploying effective fixes.

Become a Key Player at Pigment: The Revolutionary AI Business Planning PlatformPigment is a pioneering AI-driven platform designed to transform business planning and performance management, tailored for agility and scalability. We unite individuals, data, and workflows in one seamless and feature-rich solution, empowering diverse teams—from Finance to HR—to construct, modify, and synchronize strategic initiatives in real-time.Established in 2019, Pigment stands as one of the fastest-growing SaaS firms globally. Esteemed organizations such as Unilever, Snowflake, Siemens, and DPD leverage Pigment daily to make informed decisions and confidently navigate various scenarios.With over 500 team members across Paris, London, New York, San Francisco, and Toronto, we have secured nearly $400 million from leading investors and have been recognized as a Visionary in the 2024 Gartner® Magic Quadrant™ for Financial Planning Software.At Pigment, we embrace intelligent risks, celebrate innovative ideas, and challenge conventional thinking while collaborating as a unified team. If you are driven by creativity and eager to make a significant impact, we are excited to connect with you.Join Our Engineering TeamOur Engineering team plays a pivotal role in developing our SaaS platform, creating a comprehensive and user-centric product. Pigment engineers engage in the entire application development lifecycle, emphasizing design, coding, and maintaining a robust production platform. While specialization is encouraged, we promote a collaborative environment where backend and frontend roles intermingle.We prioritize user-centricity and practicality—selecting the most effective tools for the challenges we face while understanding the strengths and limitations of each technology.Our engineering culture thrives on curiosity, humility, trust, ownership, and teamwork.Our technology stack includes C# on .NET Core Linux, React, TypeScript, PostgreSQL, Google Cloud Platform, Docker, Kubernetes, Terraform, RabbitMQ, and Circle CI.Explore Our Tech Blog:If you're curious about technology and innovation, visit our blog for insights!

Join Our Team!At Plum, we are revolutionizing how people save and invest. Our mission is to empower individuals to grow their wealth for life, whether they are saving for their first home or enjoying retirement. Since our inception in 2016, over 2 million users across 10 European countries have saved more than £2 billion with our innovative automation and AI technology. We've been recognized with awards from esteemed organizations like Deloitte and Finder, reflecting our commitment to excellence.We are a passionate team of over 200 Plumsters working collaboratively across Europe, and we are eager to welcome more talented individuals to help us achieve our vision.Your RoleAs a Senior Backend Engineer at Plum, you will play a crucial role in shaping our technology and product offerings. We seek engineers who are not only technically adept but also understand the importance of delivering outstanding products to our customers.

At Feeld, we are on a mission to foster deeper connections between individuals and enhance their understanding of themselves and their relationships. Our focus is on developing an inclusive, human-centered product, and we are seeking a Senior Backend Engineer specializing in Monetization to join our fully remote team. This role is pivotal in advancing our vision of enhancing the human experience of sexuality and relationships.In this position, you will be tasked with creating, managing, and optimizing scalable and secure backend systems that are crucial for our revenue-generating activities. Your work will ensure that our monetization processes are dependable, compliant, and capable of performing efficiently at scale.Key Responsibilities:Champion results by taking ownership of the monetization funnel's health, ensuring the reliability and performance of the systems that sustain Feeld's operations.Design and uphold scalable backend systems that integrate subscriptions, billing, entitlements, pricing strategies, and promotional mechanisms as our user base expands.Guarantee high reliability and accuracy of monetization processes, minimizing incidents that affect revenue while improving detection and resolution times.Facilitate rapid experimentation by implementing feature flags, testing options, and analytics integration across monetization systems.Collaborate with the Data team to develop and maintain analytics and reporting tools that provide insights into revenue performance, user behavior, and system health.Professional Growth Opportunities:Enhance your expertise in the design and operation of revenue-critical systems at scale.Gain advanced skills in system observability, monitoring, and incident response for high-throughput financial workloads.Broaden your knowledge of analytics infrastructure, experimentation frameworks, and data-driven product development.Refine your collaboration skills with non-technical stakeholders by translating complex technical concepts into actionable business insights.

At Spotify, we are on a mission to revolutionize the way creators and listeners engage with long-form storytelling through our Audiobooks initiative. Our objective is to create a seamless ecosystem for audiobook content, facilitating smooth transfers from publishers to listeners. This includes building the robust systems necessary for content ingestion, processing, and efficient delivery across our rapidly expanding global catalog. We are seeking a talented Senior Backend Engineer to join a dynamic and impactful team within the Audiobooks Pipeline sector. This team's primary responsibility is to design and scale systems that handle the ingestion, processing, and transformation of audiobook and eBook content, metadata, and royalties, ensuring that listeners receive the right content with utmost efficiency and quality. While this role encompasses full-stack responsibilities, the emphasis will be on backend and data-centric development. We are looking for an individual who thrives in uncertain environments, is passionate about learning, and is excited to tackle complex challenges across the tech stack.

Role overview Xero Limited is seeking a Senior Engineer to join its UK Regional Team, based in London at 7 Devonshire Square. This position focuses on shaping features for the UK market, connecting technical work directly to customer needs and business outcomes. Senior Engineers at Xero handle complex challenges that span multiple products, balancing regional requirements alongside global strategy. Team structure and collaboration The team includes an Engineering Manager, Lead Engineers, and Engineers, all reporting to the General Manager of Engineering for the UK. Collaboration is a core part of the role. Senior Engineers work closely with product owners and peers across Xero, designing, building, and delivering solutions that have real impact. Projects and technical scope Current projects span the full Xero platform, including Payments, Accounting, and Payroll. This role provides exposure to a broad range of products and technical domains within Xero’s suite. Work environment Xero holds a Great Place to Work UK accreditation. Flexible work arrangements are available: choose remote, hybrid, or office-based work in London, Milton Keynes, or Manchester. Offices are designed to support collaboration and connection. Some travel may be needed to coordinate with global teams and support international partnerships. Requirements Curiosity and drive to solve customer problems, delivering clear business value across technical areas Adaptability in learning new domains and navigating unfamiliar codebases Ability to work with stakeholders and build consensus across distributed teams Commitment to high-quality engineering practices, producing scalable and maintainable code Comfort in high-visibility situations, using strong communication to engage stakeholders and broaden influence Experience with modern programming languages and frameworks, along with a solid understanding of software engineering fundamentals

TL;DRDeducta is a rapidly expanding startup catering to some of the globe's most prestigious enterprises. With strong funding, we are committed to addressing today's most significant business challenges.We are seeking a Senior Backend Engineer who will play a pivotal role in the design, development, and upkeep of our core systems.In this role, your key responsibilities will include:Creating and sustaining high-performance, low-latency APIs for enterprise-level data processing systems.Delivering exceptional code promptly. Location: London, UK. Our office is situated near London Bridge, and we prioritize in-person collaboration. Compensation: The total compensation for this position begins at £150,000. Visa Sponsorship: We are willing to sponsor a visa for the ideal candidate to join our team. What is Deducta?Deducta is a leading data intelligence platform for global corporations. We provide unparalleled clarity into mission-critical data for some of the world's largest and most intricate organizations, starting with spend data.We are at the forefront of significant business transformations. Our partners leverage Deducta to achieve impactful results at remarkable speeds.‍What is the Role?We process vast datasets containing essential enterprise information from diverse sources and formats, structuring it effectively. Our system utilizes cutting-edge LLMs to tackle this challenge with unmatched precision and at previously unimaginable scales.As a Senior Backend Engineer, you will be responsible for designing, developing, and maintaining the foundational architecture of our platform as it expands.Your contributions will include:Designing, constructing, and maintaining data ingestion and processing engines capable of supporting mission-critical operations for the largest firms globally.Developing and sustaining ultra-fast, high-volume, and well-documented APIs to facilitate these systems.Driving business growth through a blend of creativity and experimentation to enhance our product, alongside proactive problem-solving for our clients.Working closely with both technical and non-technical team members to comprehend our customers' challenges and create solutions that address them.Success in this role means:Leading development initiatives from concept to production.Consistently driving enhancements and new features. Who will be the right fit?We are in search of a technically outstanding engineer who excels in a role that offers autonomy and ownership.You might be a great fit if you possess…Strong experience in object-oriented programming within cloud environments (e.g. AWS, GCP, or Azure), with .NET experience considered a plus.Familiarity with SOLID principles, domain-driven design, and Clean Architecture methodologies.A passion for...

Join the Future of Identity with Socure!At Socure, we are revolutionizing the identity verification landscape, establishing a trust infrastructure that safeguards the digital economy. Our mission is to verify 100% of legitimate identities in real-time, proactively preventing fraud before it occurs. Our work addresses complex challenges, impacting businesses, governments, and millions of individuals globally every day.We seek passionate individuals ready to take on significant responsibilities. If you thrive in a fast-paced environment, possess critical thinking skills, and approach challenges with an ownership mindset, you’ll fit right in. If predictability is what you seek, this might not be the role for you. However, if you're eager to help shape the future of identity with a team that holds itself to the highest standards, keep reading.As a Senior Backend Engineer, you will be a critical player in our product-focused teams, designing and building scalable systems that have a meaningful impact. You will engage directly with customers to enhance satisfaction and drive continuous improvements across our product offerings.In this role, you will lead the design and implementation of distributed systems, take ownership of essential non-functional requirements such as scalability, security, and reliability, and mentor fellow engineers while remaining actively involved in development. Your expertise will be vital throughout the entire software development lifecycle, from architecture and implementation to testing, documentation, and production support.This position is ideal for backend engineers who are passionate about building robust systems using Golang, excel in a product-driven environment, and want to influence technology at scale.Key Responsibilities:Design, develop, test, and debug scalable backend services within distributed systems.Deliver on key non-functional requirements, including scalability, availability, performance, and security.Develop and maintain comprehensive tests (unit, integration, functional) to ensure high coverage and reliability.Contribute to and produce technical documentation for knowledge sharing and collaboration.Break down complex projects into actionable tasks and guide teams in their execution.

About UsAt Heidi, we are pioneering an AI Care Partner that assists healthcare professionals at every stage, from documentation to patient care delivery. Our mission is to enhance healthcare capacity while maintaining a deeply human touch. In just 18 months, we have reclaimed over 18 million hours for clinicians and facilitated more than 73 million patient visits. Currently, Heidi powers over two million patient interactions weekly across 116 countries in more than 110 languages.Founded by healthcare professionals, Heidi unites clinicians, engineers, designers, scientists, creatives, and mathematicians, all dedicated to enhancing the human connection central to healthcare. With nearly $100 million in funding, we are expanding our reach in the USA, UK, Canada, and Europe, collaborating with major health systems, including the NHS and Beth Israel Lahey Health, among others.We are agile in our approach, focused on what works, and poised to shape the future of healthcare. Are you ready to take on this challenge?Your RoleAs a Senior Backend Engineer, you will be instrumental in executing backend features, leveraging your deep technical understanding to meet user requirements. You will thrive in a hyper-growth startup environment, with substantial experience in building SaaS products.With a solid grasp of the challenges engineers face, you will prioritize key features and capabilities through effective design principles. Your ability to bridge technical specifics with business needs will enable you to transform high-level concepts into practical solutions.Embracing challenging scenarios, you will appreciate the dynamics of a flexible, flat-structured work environment and quickly navigate the complexities of developing AI healthcare products on an international scale. We believe that exceptional talent can emerge from diverse backgrounds; if you have a proven history of delivering technically demanding products and features, we want to hear from you.

About SequenceJoin Sequence and play a pivotal role in developing a revolutionary platform that facilitates seamless payment solutions for businesses. With over $1 billion in annual invoice processing and a trajectory of rapid growth, we are at the forefront of transforming financial operations.Our AI-powered revenue platform is designed specifically for modern finance teams, replacing outdated spreadsheets and cumbersome legacy systems with intuitive software that enhances performance and user satisfaction.Trusted by over 100 high-growth companies, including Cognition, incident.io, and MoonPay, we manage the entire revenue cycle, from quoting to billing and revenue recognition.Founded by a team of seasoned entrepreneurs, we achieved an impressive 10x ARR growth last year and recently secured a $20M Series A led by 645 Ventures, along with contributions from a16z and remarkable founders and CFOs from notable companies like Decagon, Klaviyo, and Wise.What’s it like to work at Sequence?We offer a small team environment with vast opportunities for impact and ownership. You will engage in meaningful work, gain direct access to customers, and develop alongside a rapidly growing company.If you’re ready to elevate your career at a fast-scaling company, we’re eager to connect with you.Your RoleWe are deeply committed to the quality of our product and are seeking passionate engineers who take end-to-end ownership—from conception to delivery and ensuring that our solutions meet customer needs.Here are some projects you may contribute to:Developing AI-Driven Approval Workflows. Create flexible, customizable approval chains that adapt to various business rules, enabling customers to define workflows in natural language.Creating an Intelligent Collections Agent. Design an automated agent that manages payment reminders and escalations through natural language instructions.Scaling Billing Infrastructure. Redesign our billing pipeline to handle significant increases in throughput while optimizing costs and storage strategies.As part of our lean team, you will have the opportunity to significantly influence our engineering practices and product direction.

Join Aircall, a revolutionary unicorn in the AI-powered customer communications sphere, trusted by over 22,000 companies globally to enhance revenue, expedite issue resolution, and empower customer-facing teams. We are transforming the landscape of customer communications by integrating voice, SMS, WhatsApp, and AI into a unified workspace.Our growth is driven by a straightforward principle: to enable teams to work smarter, not harder. Our AI Voice Agent automates routine calls, while AI Assist simplifies post-call tasks, and AI Assist Pro provides real-time insights, allowing individuals to excel in their roles. This synergy results in increased revenue, quicker resolutions, and scalable teams.Headquartered in Paris, with a solid presence in North America anchored in Seattle, Aircall also has teams in vibrant cities such as Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. Our product is beloved by customers, and we are rapidly scaling, supported by top-tier investors and continuous AI advancements across multiple product lines.At Aircall, you'll become part of a dynamic company. We are ambitious, focused on product development, and execution-oriented, with a clear impact, swift decision-making, and genuine growth opportunities.Our Work Culture at Aircall: We prioritize customer satisfaction, leverage data for decision-making, and are dedicated to delivering significant outcomes. We cherish ownership, continuous improvement, and thoughtful agility. If you thrive in a collaborative, fast-paced environment where trust and impact are essential, you will thrive here.Position Overview:As a Senior Backend Software Engineer, you will take charge of designing, developing, deploying, and maintaining essential features that enhance customer value on our voice platform.You will be expected to advocate for best practices, mentor team members, and contribute to the broader Engineering community as part of your daily responsibilities.Quality, excellence, and agility are at the core of our delivery process, and you will play a pivotal role in elevating these standards.Utilizing a diverse array of backend technologies tailored to specific needs, all hosted on AWS, we create resilient services that deliver added value on top of voice while fully integrating with our customers' critical business tools (CRM, Helpdesk, E-Commerce, etc.).

Join Spotify as a Senior Backend Engineer - Subscriptions and play a pivotal role in enhancing our subscription services.In this position, you will collaborate with cross-functional teams to design and implement scalable backend systems, ensuring seamless integration and exceptional user experiences.

About 9fin9fin is a cutting-edge AI platform revolutionizing the global debt markets, which represent the largest asset class exceeding $145 trillion.The landscape of debt markets is extensive, global, and essential, yet it often relies on disjointed data, PDFs, and manual processes. 9fin transforms this outdated infrastructure by providing a unified platform that consolidates proprietary credit data, in-depth analysis, and efficient workflows across international markets.Currently, 9fin empowers over 300 prestigious institutions worldwide, including leading banks, asset managers, private equity firms, law firms, and consulting advisors. The company is experiencing rapid growth, particularly in the US, with exceptional retention rates driven by robust workflow adoption.We are at a pivotal moment. With a validated product-market fit and strong global demand, 9fin is propelling towards becoming the definitive platform for debt markets globally.What You'll Work OnAs a Senior Backend Engineer on our Structured Credit team, you will contribute to the development of our market-leading CLO product and assist in the launch of a new vertical.Our team is dedicated to making a significant impact, leveraging technology to create value for the business. While we have overarching business goals, we enjoy the autonomy to define our team objectives and determine our success metrics. We uphold accountability and proactive behaviors such as ownership.Lead projects within a cross-functional team by defining and designing systems, building proof of concepts, and delivering new service functionalities—including APIs, data processing, and automation—while collaborating with Product and Clients.Engage in backend development and engineering primarily on the services and web applications hosted on the 9fin platform.Play a crucial role within project teams as a senior individual contributor, conducting code reviews, mentoring fellow developers, and participating in early research and experimentation with new technologies to provide insights for new features and products.Continuously enhance the 9fin codebase by seizing opportunities to automate, refactor, and document processes when it has the most significant impact.Work across diverse web platforms involving complex financial data modeling, intricate access control logic, environmental data capture, integration of ML/AI prediction services, and data visualization.

Your Mission As a Senior Backend Engineer within our Commercial Technology team, you will play a pivotal role in shaping On's digital ecosystem. You'll be responsible for designing, developing, and scaling the essential services that drive our global e-commerce platform, B2B partner portals, and retail experiences. Your contributions will significantly influence how we present product information, facilitate the checkout process, and enhance the end-to-end e-commerce user experience for our customers and partners, ensuring a seamless and premium interaction that bolsters our commercial success. Your Responsibilities Design, develop, and maintain robust and scalable backend services utilizing our modern technology stack, focusing primarily on NestJS, TypeScript, and GraphQL. Take ownership of key components within our Commercial Technology team, ensuring performance, reliability, and alignment with the needs of diverse client applications (web, mobile, and third-party integrations). Collaborate closely with frontend engineers, product managers, and other stakeholders to deliver comprehensive features. Write clean, maintainable, and well-tested code, and actively contribute to a culture of high quality and continuous improvement through code reviews and pair programming. Deploy and manage your services in a cloud-native environment on Google Cloud Platform (GCP) using Kubernetes and Docker. Engage with and contribute to our distributed systems landscape, helping to create resilient systems that can scale effectively. Your Qualifications Strong background in backend development with proven experience in building and delivering high-quality software. Proficiency in Node.js and TypeScript, with a deep understanding of modern backend frameworks. Hands-on experience with NestJS will be an advantage. Solid experience in designing, building, and consuming GraphQL APIs. Strong knowledge of relational databases (e.g., PostgreSQL) and data modeling practices. Hands-on experience with cloud platforms (GCP preferred) and container technologies (Docker, Kubernetes). You are a collaborative team player with excellent communication skills, comfortable working in an agile environment. Bonus Points for Experience with: ORM tools like MikroORM

Join Spotify's dynamic team as a Senior Backend Engineer focused on our innovative Commerce Platform. In this role, you will be instrumental in developing and optimizing backend solutions that drive our core commerce functionalities. Collaborate with cross-functional teams to enhance user experiences, improve system performance, and ensure robust scalability.