Senior Backend Software Developer (SFIA5)

Galaxy Digital Services develops digital asset solutions at the intersection of finance and technology. The company invests in data center infrastructure to support AI and high-performance computing, focusing on blockchain and digital asset innovation. With a global presence and a team led by CEO Michael Novogratz, Galaxy serves institutions, startups, and developers navigating the digital economy. What you will do This Backend Java Developer role is part of the Lending technology team in London. The position centers on building and maintaining crypto lending systems. Core responsibilities include: Developing and enhancing lending infrastructure Working on collateral management features Implementing interest calculation logic Building liquidation processes Integrating with blockchain networks and traditional financial systems Who succeeds here The team values engineers who work independently, solve complex problems, and take ownership of their projects. Analytical skills and a drive to resolve challenges are important for this position. Our core values Strive for Excellence Be Selective to Achieve Effectiveness Maintain High Alignment with Loose Coupling Engage in Transparent Disagreements Support Independent Decision-Making Build Exceptional Teams

Galaxy Digital Services is searching for a Lending UI Developer to join the London team. This role sits at the intersection of finance and technology, focusing on digital assets and blockchain innovation. The company is known for its institutional digital assets platform, which covers trading, investment banking, asset management, staking, self-custody, and tokenization technologies. Galaxy also invests in and operates data center infrastructure that supports artificial intelligence and high-performance computing. The team brings together deep crypto expertise and institutional knowledge, working to shape the future of Web3 and AI under the leadership of CEO Michael Novogratz. What you will do Develop and maintain user interfaces for lending products within the digital assets platform Collaborate with teams across trading, asset management, and technology to build effective solutions Contribute to products that support blockchain and digital asset innovation Requirements Experience building UI for financial or digital asset platforms Comfort working in a collaborative, high-achieving team Based in or able to work from London Our values Strive for excellence Be selective for greater impact Maintain high alignment and allow for flexibility Encourage transparent disagreement Support independent decision-making Foster collaborative teams Galaxy Digital Services has offices in New York City and across North America, Europe, the Middle East, and Asia. Learn more about the company's products and businesses at www.galaxy.com.

pharmacy2u, the UK's largest online pharmacy, is hiring a Java Developer for its central London team. This hybrid position blends remote work with in-person collaboration twice a month in the office. Key responsibilities Develop and maintain Java-based healthcare applications serving over 1.8 million patients across England. Work closely with frontend and backend developers, clinicians, and quality analysts to deliver secure and dependable software. Contribute to projects that advance digital healthcare delivery. Optional participation in an out-of-hours rota is available for those seeking additional experience and pay. Work arrangement Hybrid setup: primarily remote, with two required in-office days per month in central London. Core working hours run from 09:30 to 16:00, with flexibility to adjust schedules around these times. About pharmacy2u pharmacy2u is dedicated to setting the benchmark for digital healthcare in the UK, with a focus on patient-centered solutions and consistently high service standards.

Join Capco as a Senior Backend Engineer specializing in Java and play a pivotal role in designing and implementing robust backend solutions that drive our innovative projects. You will collaborate with cross-functional teams to deliver high-quality software that meets our clients' needs. This is an exciting opportunity for seasoned professionals looking to make a significant impact in a dynamic environment.

Corgi is an AI-driven insurance company designed for tech startups. With $108 million in funding and a licensed carrier status, Corgi is expanding into the UK and EU. The core platform runs on Django, integrates Stripe for payments, and uses AI for underwriting. Role overview The team is hiring a Backend Developer in London. This is a hands-on position for someone who enjoys building and launching products quickly. Developers who have taken projects from concept to live deployment, whether as side projects, weekend builds, or products used by real users, will feel at home here. What matters here Experience independently building and launching real-world projects Ability to deliver results in hours or days, not weeks Comfort working across the stack and adapting to new problems Openness to better ideas, even with strong technical opinions Low-ego, outcome-focused mindset Drive and energy for a rapid startup pace How the team works Decisions are made quickly, without waiting for perfection New products and improvements ship regularly, not just quarterly Ship-and-iterate approach instead of lengthy reviews High intensity expected during both launches and quieter periods Transparency is standard; decisions are made openly Internal competition pushes everyone to improve This role is for builders who want to contribute actively. Behaviors that don’t fit Office politics, avoiding responsibility, or gossip Taking feedback personally instead of using it to improve Complicating processes instead of simplifying them Missing commitments or not following through promptly How to apply Send links to your GitHub, personal website, or live projects you have launched CVs are not required Email applications to: sergio@corgi.com If you cannot show shipped work, this may not be the right fit Location and compensation Role based in London; on-site or hybrid options available Salary: £75,000 to £140,000 plus equity Compensation reflects proven shipping ability, not job titles

Join Edra: Pioneering Solutions in Enterprise AIAt Edra, we're tackling one of the most challenging issues in enterprise AI: while AI models are inherently generic, company processes are uniquely specific. Our mission is to develop AI agents that comprehend how these processes operate and effectively manage their tasks.As a Series A startup, we are proudly supported by Sequoia and other prestigious venture capital firms. With our teams expanding in New York and London, we are a highly technical group comprising engineers, AI researchers, and strategists who all uphold a rigorous standard for talent. We believe that exceptional individuals are the cornerstone of our future success.Your RoleWe seek dedicated Backend Engineers who are passionate about the art of software development. Your focus will be on implementing strong typing, thoughtful API design, and robust data modeling. You will not be developing AI models; instead, you will construct the surrounding ecosystem: the platform, workflows, interfaces, integrations, and observability that render our AI applicable in real-world scenarios. As one of the early engineers at Edra, you will have the opportunity to influence not only the product but also the engineering culture, tooling decisions, and technical frameworks upon which our company is built.Our approach is intentional and thorough. There is no distinction between 'building it' and 'shipping it'—you will oversee the journey from conceptualization to deployment, taking full ownership of your outcomes. We prioritize thoughtful development over speed, striving for a balance between velocity and quality.Key ResponsibilitiesDesign and implement platform systems utilizing Python (FastAPI), including API contracts, database schemas, and infrastructureDevelop and sustain connectors, integrations, and data pipelines that link our platform to external systemsCreate internal libraries, tools, and interfaces that enhance the productivity of the engineering teamTake full ownership of your work by gathering context, managing dependencies, and driving tasks to completion independentlyEngage in multiple roles across the stack—design a schema in the morning, develop the API layer in the afternoon, and troubleshoot a deployment issue by day’s endParticipate in weekly product meetings, understand user interactions with your creations, and help shape future developmentsCollaborate daily with a small, elite team of engineers and AI specialistsHave a direct impact on the technical direction: select tools, establish patterns, and define conventions for the team

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.

Role overview airapps is hiring a Backend Engineer for its London Metropolitan Area team. This role focuses on designing and building scalable server-side applications that support the company’s products and services. What you will do Work closely with colleagues across different functions to develop backend systems Contribute to the architecture and implementation of server-side features Help ensure backend solutions can scale and perform reliably Location This position is based in the London Metropolitan Area.

Join Mustard Systems, where we harness the power of statistical modeling to analyze sports events, enabling accurate predictions of future outcomes. By leveraging our proprietary datasets, sophisticated statistical models, and custom software solutions, we aim to deliver precise forecasts in the world of sports.We prioritize speed and real-world impact over perfection in code. If you are an engineer who excels at rapid problem-solving and thrives in a flexible, outcome-oriented environment, you'll find a home with us.Your Role:Enhance our connections to new liquidity providers using advanced web scraping and reverse engineering techniques.Create and maintain low-latency, real-time data feeds to support trading strategies based on extracted data.Improve system visibility for teams to gain insights into integration challenges and enhancements.Our agile methodology allows us to adapt plans as new information and opportunities arise. Developers play a pivotal role, taking complete ownership of their software from design through development, testing, review, and production support.Key Responsibilities:Design and Implement Impactful Features: Develop features that align with our business objectives, ensuring high-quality code that delivers measurable value.Collaborate on Code Quality: Review and test peer code to uphold functionality, maintainability, performance, and quality standards.Production Support: Take charge of your team’s software in production, ensuring stability and prompt resolution of any issues.Cross-Team Collaboration: Partner with other development teams on cross-functional projects, working alongside traders and quants to devise the best solutions to real business challenges.Participate in Out-of-Hours Support for our Software Systems.Core Technology Stack:Languages: Python (3.10+), JavaScript/TypeScript for frontend tasks, and Go for select infrastructure.Tools: RabbitMQ and Kafka for messaging, PostgreSQL and Redis for data storage.Environment: Linux servers.Observability: OpenTelemetry, Prometheus, Grafana, and Zabbix.Required Qualifications:Solid experience in software development, particularly with Python.A degree in Computer Science or a related quantitative field from a recognized university.Excellent communication skills, enabling you to explain complex technical concepts to both technical and non-technical audiences.Strong decision-making skills, with an ability to make informed trade-offs in implementation and architectural decisions, balancing innovation with practicality.Experience with web scraping and related technologies is essential.

Join our innovative team at reteam as a Backend Engineer! In this role, you will collaborate with cross-functional teams to develop robust backend solutions that power our applications.We are looking for an enthusiastic engineer who is passionate about creating efficient and scalable systems. Your expertise will contribute to enhancing our product offerings and improving user experiences.

About MetaviewMetaview is dedicated to eliminating toil in the workplace. We believe that toil hinders progress, much like friction impedes motion. Our innovative solution is found in Human-Computer Symbiosis.With the introduction of AI copilots, the way we work is set to transform:Encouraging a flow state while minimizing toil.Enhancing insight while reducing guesswork.Focusing on human-centricity rather than process-centricity.Metaview serves as the AI copilot for hiring processes.Founded in April 2018 by Siadhal and Shahriar, who left their roles at Uber and Palantir, respectively, to address their own challenges in product and team development. Today, we empower thousands of users at leading companies such as Quora, Robinhood, Brex, Elastic, and Replit.Our team is small, high-performing, and fast-paced, with a relentless focus on delivering exceptional work.

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.).

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.

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.

Join our dynamic team at Axicorp Financial Services as a Backend Developer. In this role, you will leverage your expertise to develop robust backend services that drive our financial applications. Your contributions will directly affect our efficiency and the overall customer experience.We are looking for a candidate with a passion for technology and a commitment to excellence. If you thrive in a fast-paced environment and enjoy solving complex problems, we want to hear from you!

We are seeking a highly skilled Senior Java Developer to join our dynamic team at Qurious Associates Limited. In this role, you will leverage your expertise in Java development to design, implement, and maintain robust applications that meet the needs of our clients. You will collaborate with cross-functional teams to deliver high-quality software solutions using modern development practices.

Join Herondata as a Principal Backend Engineer and lead the charge in developing robust backend architectures. You will collaborate with cross-functional teams to design, implement, and optimize scalable solutions that support our mission of providing top-tier data services. Your expertise will drive innovation and enhance our platform's performance, ensuring we remain at the forefront of the industry.

Join the Nevis TeamAt Nevis, we are revolutionizing wealth management with the world’s first AI-driven platform. In less than a year, we have successfully managed over $50 billion in assets and are aiming to reach $100 billion by year-end.With a robust backing from prominent investors, including Sequoia Capital, ICONIQ, and Ribbit, Nevis stands out as one of Europe’s most highly funded and rapidly growing Series A startups.Your RoleWe are seeking a talented Senior Software Engineer specializing in Backend Development to enhance our elite engineering team. You will be instrumental in designing and developing high-performance systems that drive Nevis’ AI-centric wealth management solutions.This role involves building a resilient backend architecture that supports our intelligent workflows, focusing on developing APIs, microservices, and data pipelines for managing substantial assets. Collaborating with engineers from leading fintech firms like Revolut, you will be at the cutting edge of technology and finance, creating scalable systems that prioritize reliability, performance, and thoughtful design.If you are passionate about working on innovative projects, thriving in a fast-paced environment, and taking ownership of your work from design through to deployment, you'll excel at Nevis.

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.