Senior Backend Engineer

At Zaizi, we are on the lookout for a highly skilled Senior Backend Software Developer who possesses exceptional technical expertise and a genuine enthusiasm for enhancing user experience and outcomes. In this role, you will take ownership of your deliverables while also collaborating with a multidisciplinary team to foster innovation and share creative ideas.Our work environment is inclusive, modern, friendly, and democratic, where we value bright, positive-thinking individuals with a proactive mindset. If you thrive on challenges and aspire to excel in your field, you will find a perfect fit with our team!

Join Palantir Technologies as a Senior Backend Software Engineer and contribute to our innovative application development team. You will design and implement robust backend systems that are scalable and efficient, working alongside talented engineers in a collaborative environment.

As a Senior Backend Developer specializing in Ruby on Rails, you will play a pivotal role in architecting, developing, and validating server-side logic for web applications. Your expertise will be essential in crafting efficient, reusable, and robust Ruby code, while optimizing systems for peak performance and scalability. You will work collaboratively within cross-functional teams, integrating front-end components into our applications. Your responsibilities will also include conducting code reviews, mentoring junior developers, and converting business requirements into effective technical solutions.The ideal candidate will possess a Bachelor's or Master's degree in a related discipline, along with a minimum of eight years of hands-on experience in Ruby on Rails development. You should be well-versed in various software testing methodologies, demonstrate strong analytical skills, and have excellent proficiency in English.

Are you an experienced Laravel developer with a passion for crafting robust backend systems? If so, we would love to connect with you! Join the Trybe team as a Senior Backend Developer and play a pivotal role in our mission to deliver exceptional software solutions in the industry. About Trybe:Trybe is a forward-thinking startup dedicated to providing innovative cloud-based software to clients in the hotel, spa, and wellness sectors. Our goal is to transform both guest experiences and back-of-house operations. Founded in 2020, we are proud to partner with leading spa and leisure operators globally. We foster a high-performance, collaborative team culture, welcoming talented individuals who thrive in a dynamic startup environment as we continue to expand.Key Responsibilities:Develop and maintain the Trybe Laravel backend, which powers our entire platform.Create APIs for frontend engineers, facilitate integrations with partners, and manage data processing jobs.Write extensive tests using Pest to ensure top-quality code delivery.Collaborate closely with engineering and customer experience teams to implement innovative features that meet client needs.Contribute ideas throughout the product development cycle to enhance feature quality.Who We Are Looking For:A minimum of 5 years of commercial experience with Laravel.A strong passion for technology and problem-solving.Ability to write clean, maintainable, and thoroughly tested code.A self-motivated learner who thrives in a fast-paced environment.Excellent communication skills and a collaborative team player.Experience handling large datasets, as we process millions of bookings annually.Proficient in building efficient RESTful APIs.Bonus Skills:Familiarity with MongoDB and Eloquent.Experience using Elasticsearch for data aggregation and reporting.

Join Zaizi as a Senior Backend Software Developer, where you'll leverage your robust technical expertise while enhancing user experiences and outcomes. You will be a dependable contributor to your projects and an innovative thinker within our collaborative multidisciplinary team.At Zaizi, we foster an inclusive, modern, and friendly work culture that values fresh ideas and a proactive mindset. If you are passionate about pushing your limits and excelling in your role, you'll thrive in our environment!

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 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 ContributionThe Senior Software Engineer III (Backend) plays a pivotal role in tackling intricate tasks and is instrumental in advancing the objectives of their team. This role includes leading small projects or components while crafting robust feature sets that adhere to high architectural quality standards.Key ResponsibilitiesAdvanced Software Development: Actively participate in the design and implementation of sophisticated software solutions, ensuring optimal functionality, scalability, testability, and reliability. Assist with system design and grooming processes.Code Quality and Optimization: Enhance and maintain code quality through thorough review practices, optimization strategies, and adherence to industry best practices.Innovative Problem Solving: Tackle complex technical challenges with creative solutions.Collaboration and Communication: Collaborate effectively within the engineering team and across various departments, working alongside other engineers, product managers, and stakeholders.Continuous Learning and Adaptation: Stay current with emerging technology trends and continuously enhance skills and knowledge.Technical Documentation: Produce and maintain comprehensive technical documentation for clarity and accessibility.

Join a Pioneering CompanyAt Palantir, we develop cutting-edge software that revolutionizes data-driven decision-making and operations. Our platforms empower partners to create life-saving medications, foresee supply chain challenges, locate missing individuals, and much more by connecting the right data with the right people.Role OverviewAs a Backend Software Engineer at Palantir, you will engineer scalable software that reshapes how organizations leverage data. You will actively participate throughout the product lifecycle—from ideation and design to prototyping and delivering production-ready solutions. Collaborating closely with both technical and non-technical team members, you’ll identify customers' challenges and create products that effectively address them. We promote cross-team interactions to foster the sharing of skills, context, and experiences, enabling you to gain insights into various technologies and product facets. Our engineers operate independently, making impactful decisions within a supportive community that encourages growth and development into strong technical contributors and engineering leaders.Your daily responsibilities will be dynamic, adapting to user needs and technical hurdles. One day, you might partner with other engineers to design a groundbreaking system that facilitates a new workflow; the next day, you could focus on optimizing performance for low-latency operational results.Our Product Development teams consist of small, agile groups of Software Engineers, each dedicated to specific product facets. These teams collaborate to build cross-functional capabilities, enhance user workflows, and consistently improve our software’s efficiency and reliability.We are seeking engineers who are enthusiastic about tackling real-world challenges and empowering both developers and end-users to maximize their potential. If you are driven to create reliable, high-performance, and scalable systems and to design robust APIs and primitives, this role presents a unique opportunity to significantly impact our products and the communities that utilize them.Unique Opportunity: Frontline ProgramFoundry Software Engineers may be selected for the Frontline Program, a distinct opportunity to engage directly with customers. In this short-term assignment, you will work alongside users to gain invaluable insights into product application and the challenges they encounter. Unlike standard engineering roles, Frontline involves tackling complex, ambiguous problems, empowering you to deliver impactful solutions across critical industries and institutions.

Please note that this position necessitates relocation to our Milan office.About SatispaySatispay is on a mission to transform the way people manage everyday payments, making them straightforward, equitable, and accessible for all. Our vision has evolved to redefine the future of financial transactions.We are a dynamic movement empowering millions, driven by a collective mission to address significant challenges. Our approach is swift, courageous, and collaborative, fostering an environment where innovation thrives.Joining the Core Team means engaging with essential systems that manage interactions with external banks, orchestrate payments, and create the foundational infrastructure for Identity and Access Management (IAM). This team also oversees critical risk management functions, including credit risk assessment and fraud detection.If you’re eager to craft impactful solutions that serve as the bedrock for our product teams, you’ve found the right place.Your RoleAs a Senior Backend Software Engineer within the Core Team, you will be pivotal in developing the backbone of our payment platform. You will ensure the technical excellence and timely delivery of complex systems that influence multiple services and product teams throughout the organization.Your daily responsibilities will include:Engineering Core Platform Domains: You will help design and evolve our most sensitive systems including the Transaction Ledger, IAM, and Payment Orchestration, ensuring they remain high-performing, scalable, and functional for product team integration.Scaling Risk & Financial Engines: You will optimize and develop services dedicated to bank integrations, credit risk, and real-time fraud detection, constructing robust logic to safeguard our financial ecosystem.Cross-Team Technical Leadership: You will lead technical analyses for projects that span multiple services, facilitating discussions and producing comprehensive documentation (Smart Papers) to ensure clarity and robustness in your designs.Collaborative Development: Engage actively with product teams to refine requirements and enhance the overall system architecture.

Join Apron as a Senior Software Engineer - BackendAt Apron, our mission is to empower small and medium-sized businesses by ensuring their success. We understand that cash flow challenges often stem from the pressure of demand payments on business owners, which can hinder their ability to meet these obligations.We are bridging this gap by modernizing and simplifying the payment processing experience: from capturing invoices to issuing expense cards, and facilitating transactions—all in one seamless platform.As a rapidly growing company, we have expanded our team to approximately 100 talented individuals across the UK, Germany, Spain, and beyond. Backed by notable investors such as Index Ventures, Bessemer Venture Partners, Zinal Grow, and Tony Fadell, we have successfully raised $50 million to fuel our growth.Our Engineering CultureAt Apron, engineers play a pivotal role in our operations. Here's what you can expect:Customer-Centric Development: We utilize cutting-edge technology to create products that genuinely enhance our customers' lives.Ownership of Projects: From planning to execution, we take full responsibility for our work.Complex Financial Challenges: We embrace the intricacies of finance, navigating complex business logic and ensuring every detail is accounted for. Precision and attention to detail are paramount in creating a reliable product.Pride in Our Code: We prioritize building fast, secure, and scalable code that can grow with us.Integration of AI Tools: We leverage the best available technologies to ensure our product is genuinely beneficial.Your ResponsibilitiesWe are looking to expand our Card team, which has just launched. As a Senior Software Engineer, you will:Collaborate Across Teams: Work closely with Frontend Engineers, Product Managers, and Designers to develop innovative features.Design Robust Systems: Develop core financial integrations to ensure the security of customer funds and expedite transactions.Drive Innovation: Share your expertise with the team to foster innovation and proactively suggest improvements.

Join Duffel as a Backend Software Engineer and play a pivotal role in shaping the future of travel technology. We are seeking passionate individuals who thrive on solving complex challenges and are excited about creating scalable and efficient backend systems.

Join Contentful as a Senior Backend & Infrastructure Software Engineer and play a pivotal role in shaping the future of our platform. In this role, you will design and implement robust backend solutions that enhance our infrastructure capabilities, ensuring scalability and performance. Collaborate with cross-functional teams to tackle complex technical challenges and drive innovation within the organization.

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 Updraft: Transforming Financial Futures!At Updraft, an award-winning fintech company authorized by the FCA, we are on a mission to revolutionize how individuals perceive and manage their finances. Our innovative platform automates everyday financial decisions, making it easier for users to handle credit cards, overdrafts, and loans. Experience a comprehensive spending overview across all financial accounts with Open Banking technology. Access a complimentary credit report with personalized tips to enhance your credit score. Leverage AI-driven financial planning tailored to help users manage expenses, eliminate debts, and boost credit ratings. Utilize intelligent lending solutions designed to lower the cost of credit. With over 800,000 users and a remarkable reputation within the UK fintech landscape, Updraft has helped individuals convert approximately £500 million in high-cost credit card debt into more manageable options, paving the way for better financial health. Rated 4.8 on Trustpilot, 4.8 on the Play Store, and 4.4 on the iOS Store by our satisfied customers. Recognized as a participant in the Technation Future Fifty 2025, a prestigious program that supports innovative startups on their journey to IPO. Featured in the Sifted 100 UK startups list for two consecutive years (2024 and 2025). We are seeking talented professionals to join us in our next growth phase, offering a unique opportunity to make a measurable impact. Expect a hybrid work culture that fosters collaboration across functional teams, generous learning budgets, wellness benefits, and the freedom to innovate and directly influence our customers' financial journeys.Become part of our commitment to building a fairer credit system!

Join Us as a Senior Backend Software EngineerAt Freetrade, our mission is clear: to simplify investment for everyone. Investing shouldn’t be a convoluted or costly endeavor that deters individuals from maximizing their savings. We’re here to change that narrative!As we expand our team, we are searching for passionate individuals eager to redefine how our customers invest and enhance their wealth. If you are motivated by solving intricate problems and crafting innovative products, you will thrive in our environment.With a significant milestone approaching in 2026, following our transformative agreement to join the IG Group, we will continue to operate independently while benefiting from the resources and expertise of a leading player in the industry.This year marks a pivotal moment for us as we accelerate our product roadmap, introducing exciting new features including mutual funds, bonds, and family investment tools. We are also exploring the potential of AI to further enhance our customer experience.Our cloud-native infrastructure relies on Google Cloud Platform tools such as Firestore, Google Kubernetes Engine, PubSub, and Cloud SQL, enabling us to deliver a reliable and efficient platform built with Typescript. Here, your contributions will have a direct and positive impact on both customer experience and our overall business strategy. If you are eager to expand your technical expertise, contribute to new product development, and work in a creative, experimental atmosphere, this role is perfect for you!Why You Should Join Our Engineering Team?Become a vital part of a team that is shaping the future of investment. As a Senior Backend Software Engineer, you will lead the comprehensive development of impactful features, demonstrating your passion for independent problem-solving while scaling our next-generation, user-centric products. Our ideal candidate thrives in a dynamic, fast-paced environment and enjoys crafting innovative solutions.

Join our team at Wise as a Senior Software Engineer I specializing in backend development with Java. In this role, you'll be a pivotal member of our Business Accounting Integrations and Reporting team. Your expertise will contribute to building robust features that enhance the user experience and streamline business processes.We are looking for a passionate engineer who is eager to tackle complex challenges and drive innovative solutions that impact our users. Collaborate with cross-functional teams to design, develop, and implement high-quality software solutions.

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.

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!