Senior Backend Engineer

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 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.

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...

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.

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.

Wheely provides premium transportation services in major cities across Europe, the US, and the Middle East. The company supports over 100,000 active riders and 1,200 corporate clients, combining advanced technology with professional chauffeuring. With $43M in funding and annual revenue exceeding $100M, Wheely continues to grow, recently expanding into New York City. Role overview The Senior Backend Engineer, Platform, joins a team responsible for building and maintaining the foundational systems that power Wheely’s engineering organization. This group develops shared tools, manages significant migrations (such as moving away from a Ruby monolith), and works to strengthen the company’s infrastructure. The team emphasizes lightweight frameworks and clean, maintainable code, relying on practices like Test-Driven Development (TDD), Domain-Driven Design (DDD), and continuous integration and delivery. Technology stack Go (Golang) as the primary language Ruby monolith (legacy, currently being migrated away from) PostgreSQL and MongoDB for databases RabbitMQ and Redis for messaging and caching gRPC and Thrift for APIs and protocols AWS, Kubernetes, and Terraform for cloud and infrastructure Interview process Initial recruiter screening Algorithm assessments Live coding exercises Systems design discussions For senior candidates, a structured review of previous experience and achievements Wheely seeks engineers who care about their craft and want to contribute to the platform as the company continues to grow.

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

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.

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.

About Us: At Breakroom (https://www.breakroom.cc), we are on a mission to create a more equitable world by ensuring every job is a good job. We are developing a community-driven rating system for jobs globally, providing essential information to empower individuals in their career advancements while assisting employers in fostering positive work environments.With over 3 million users comparing their jobs and more than 18,000 employers rated across the UK and the US, we are committed to building an inclusive and top-tier team. We welcome applicants from all backgrounds.Position OverviewAs we prepare to launch Breakroom in the US, we are expanding our engineering and product development team. We seek passionate individuals who want to be part of an early-stage team focused on scaling our operations in a new market. Your responsibilities will include:Designing, writing, deploying, and maintaining high-quality codeCreating internal tools and refining our processesProviding your technical expertise to influence product and team decisionsOur technology stack includes Elixir, using the Phoenix web framework, alongside Postgres, Redis, Google Pub/Sub, and Elasticsearch. While familiarity with Elixir/Phoenix is preferred, we are committed to supporting you in learning these technologies on the job.Work CultureWe adopt a lightweight agile methodology in product development, heavily relying on data for informed decision-making while prioritizing user experiences. Our team thrives on collaboration, working closely with designers, product managers, and fellow engineers. To facilitate this teamwork, we operate from our Spitalfields office in London on Tuesdays and Wednesdays. We release updates multiple times a day and encourage engineers to engage fully in the lifecycle of their projects.Key RequirementsTo excel in this role, you should:Be driven by our mission to create equitable workplacesPossess 5+ years of experience in web software developmentHave in-depth knowledge of backend programming languages, including Elixir, Ruby, Python, or Node.jsHave experience with full-stack web frameworks like Phoenix, Ruby on Rails, or DjangoHave a track record of developing complex features and servicesCommunicate complex technical ideas effectively across diverse teamsHave experience managing operations for high-traffic websitesWork well in cross-functional teamsBe available to support Breakroom during off-hours as neededPreferred Qualifications:Experience working on consumer-facing applications

Your Role at AccuRx as a Senior Product Engineer...Join us in creating innovative software solutions that empower GP practices, hospitals, and care homes across the UK. We're tackling one of the most significant challenges in healthcare communication at a national scale.Our current technology stack includes C# (.NET Core), Kubernetes, SQL, React, TypeScript, ES6, and Redux—though we embrace change and continuous learning. As a Senior Product Engineer, you will play a pivotal role in shaping how our technology evolves as our product and organization expand.Daily Responsibilities:Take ownership of developing and refining core product functionalities from inception to production, including ongoing enhancements.Participate in user research sessions with patients and healthcare professionals to gain deep insights into their needs before proposing solutions.Work closely with product managers and designers to guide product direction, design, and technical strategy.Design and implement complex features that deliver significant impact while ensuring speed, quality, and sustainable maintenance.Maintain ownership of the services you develop, ensuring reliability, performance, and continuous improvement in production environments.Drive technical product decisions as part of a collaborative, cross-functional product team.Serve as a hands-on senior individual contributor while providing mentorship to junior engineers on your team.Ideal Candidates Will Have:Demonstrated success as a Senior Backend Engineer or Senior Product Engineer.Experience with C# (.NET Core) is preferred, but candidates with Java experience who are eager to learn C# are also welcome!Experience in a user-centric business environment, preferably in healthcare or related sectors.

Join our dynamic team as a Senior Software Engineer specializing in Backend development. In this role, you will collaborate within our autonomous agile teams to craft the services that drive the Blacklane platform. Your contributions will enhance our back-office systems and address integration challenges for our business partners.Our Tech Environment: Our technology stack includes Ruby, Go, TypeScript, and Java, all structured using Domain-Driven Design (DDD). These services are deployed on Kubernetes and communicate via domain events using SQS and Kafka. We utilize a variety of data storage solutions including PostgreSQL, MySQL, Elasticsearch, Redis, and DynamoDB. Our cloud infrastructure is primarily based on AWS, with provisioning managed through Terraform.YOUR CHALLENGE:Address unique challenges to customize our products for specific markets.Maintain high standards through thorough test coverage, documentation, code reviews, and knowledge sharing.Dedicate time to optimizing performance, usability, and maintainability of the systems you oversee.Focus on personal development by acquiring new skills and technologies.Collaborate with a motivated, open-minded team committed to enhancing travel experiences for our guests.ABOUT YOU:You are proactive, curious, and a collaborative team player.You have at least 5 years of experience with two or more programming languages.You are proficient in at least one of the following languages: Ruby or Go.You possess knowledge of the HTTP protocol and have experience with REST APIs.You write high-quality, maintainable code and are familiar with the challenges of distributed systems.You are eager to learn more about event-driven architecture and domain-driven design.You have experience with Docker and containerized environments; knowledge of Kubernetes and Terraform is an advantage.

About the CompanyAffinidi is a pioneering technology firm focused on reimagining data ownership. We empower both businesses and individuals to take control of their data, providing a holistic approach to managing their digital identity while prioritizing privacy and security.Our innovative technology facilitates decentralized digital identity solutions, ensuring that everyone has the right to own and govern their data. We are dedicated to establishing a trustworthy ecosystem for digital credentials that allows secure data and service exchange across various sectors and borders. About the Role: We are seeking a solution-driven Senior Backend Engineer who possesses substantial expertise in Rust. The ideal candidate will have a track record of delivering robust backend solutions and is eager to contribute to our mission of transforming digital identity.

At Plain, we are revolutionizing customer support for the modern B2B landscape. Our aim is to develop the most rapid and powerful platform, enabling companies to transcend traditional reactive support and foster genuine customer relationships.Renowned companies such as Cursor, Raycast, and Granola trust Plain to consolidate their customer interactions, enhance team collaboration, and elevate their workflows through the integration of AI.The B2B customer support sector is experiencing a monumental transformation, with AI redefining customer engagement. Support is evolving from a siloed function to a collaborative effort across platforms like Slack, Discord, and other communication channels. The outdated methods of slow, manual, and fragmented processes are no longer viable.This position offers a hybrid work model, requiring 3 days a week in our London office.Key ResponsibilitiesWorking at Plain involves more than just managing tasks; it encompasses owning and addressing challenges comprehensively—from infrastructure decisions to feature design and user interface elements.In this role, you will:Influence Product Strategy: Contribute to the technical architecture and product roadmap, effectively balancing customer insights with long-term product sustainability.Deliver Features from Concept to Launch: Define, develop, and deploy product features that directly address customer needs. Teams include:Core Product Team: Manage all customer-facing channels (Slack, Discord, Email, etc.), core data models, and customer requests while balancing rapid execution with foundational integrity.Developer Infrastructure Team: Create the essential tools that empower every engineer at Plain to effectively deliver and maintain the product, with a focus on optimizing team speed and minimizing obstacles.Enhance Backend Architecture: Tackle some of our most intricate challenges, from data modeling to high-performance reporting, establishing standards for our development processes.Optimize Developer Experience: Ensure that Plain is not only user-friendly but also developer-friendly, from data pipelines to APIs.

Join Our Dynamic Team at XapienAt Xapien, we empower businesses to truly understand their connections with suppliers, investors, partners, and third parties. Our innovative approach merges speed, scale, and precision, utilizing advanced AI technology.Since our inception in 2018, we've evolved from a deep-tech startup to a key player in AI-driven due diligence and risk intelligence. The year 2024 marked a significant milestone, with the successful closure of a $10M Series A funding round and accolades in the Chartis RiskTech100® and Everest Group’s Leading 50™. Our expansion has led to a broader product range, new market entries, and an expanding customer base.Our Growth TrajectoryWe're witnessing accelerated demand across various industries, especially in wealth management, financial services, and supply chain onboarding, extending our reach beyond the UK to customers in the Middle East, Asia, and Oceania.Why Now is the Perfect Time to Join UsThis position is not just another role; it’s a chance to influence the future of the due diligence sector with a market-leading product that organizations worldwide trust. Whether your expertise lies in marketing, communications, sales, or finance, your contributions will be vital in driving growth, enhancing credibility, and connecting our product with a swiftly changing market.As we scale rapidly, with an increasing number of customers and product releases, we face larger regulatory and market challenges. The expectation for real-time insights in due diligence is higher than ever. Your role will go beyond routine tasks; you will be shaping strategy, refining processes, and positioning a brand that is redefining trust and transparency.If you're passionate about learning, innovating, and making a meaningful impact, now is the time to join Xapien.The RoleWe are seeking a skilled Senior Backend Engineer to take on a pivotal technical leadership role within our engineering team. You will tackle our most complex technical challenges, take ownership of critical components within our platform’s architecture, and help guide our technical direction to ensure we continue to stay ahead in the industry.

Join commercetools as a Senior Backend Engineer, where you will play a pivotal role in shaping innovative backend solutions using TypeScript. Collaborate with cross-functional teams to create scalable and resilient microservices that empower our clients to deliver exceptional digital commerce experiences.

About UsAre you ready to embark on a thrilling challenge?At XYZ Reality, a dynamic and award-winning Series-A startup, we're on a rapid ascent toward our next funding milestone. Our vision is to revolutionize the construction sector by enhancing our platform's features, performance, and scalability.We thrive in a fast-paced, multi-disciplinary environment, engaging in various domains such as cloud development, electronics, embedded software/hardware, mechanical design/manufacturing, AI & computer vision, and data science—all contributing to our innovative BIM Platform.To propel this mission forward, we are in search of a Backend Engineer with extensive Node.js experience to assist in our transition from Java to Node.js and develop high-performance, scalable backend services. You will collaborate closely with our API development, client applications, and data pipeline teams to design and deliver robust, efficient solutions.Our office is situated in central London, just a short stroll from Angel Station.