Senior Software Engineer I at Checkout.com | London

Join our dynamic team at Wise as a Senior Software Engineer I focused on Investments, where you will leverage your expertise in Java to drive innovative solutions. You will collaborate with cross-functional teams to enhance our investment platform, ensuring scalability, performance, and security. Your contributions will directly impact our mission to make money transfers and investments seamless and accessible for everyone.

Role Overview Wise is looking for a Senior Software Engineer II focused on Investments to help design and build Java applications. This position is based in London and centers on projects that support and improve Wise's investment strategies. What You Will Do Develop and maintain Java-based applications for the Investments team Work closely with engineers and stakeholders to deliver features and improvements Contribute to projects that directly impact Wise's investment products and processes Collaboration This role works within a collaborative team, sharing ideas and solutions to solve complex problems and deliver reliable software.

Join Wise as a Senior Software Engineer I, where you will play a crucial role in developing and enhancing our Acquiring Platform. As a backend engineer specializing in Java, you will collaborate with cross-functional teams to create reliable, scalable, and innovative software solutions that will help us deliver exceptional payment experiences to our users.

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 G MASS as a Senior Software Engineer and play a pivotal role in supporting a prominent Investment Manager. This initial 6-month engagement places you within a core engineering team that operates in a dynamic, quantitative investment setting. You will be integral in enhancing the technology and data frameworks that power systematic trading strategies and cutting-edge research. Your contributions will enable investment teams to efficiently access, process, and leverage extensive market and research data in a fast-paced, analytics-driven environment.Key Responsibilities:Architect, develop, and refine large-scale data and infrastructure platforms that underpin trading and research activities.Establish and sustain systems designed to process vast amounts of data from a variety of global sources.Collaborate closely with researchers, traders, and fellow engineers to ensure seamless support for investment workflows.Enhance the scalability, performance, and reliability of distributed systems.Utilize Java and Python primarily in the development and maintenance of services.Engage with modern data and messaging technologies, including Kafka, ArcticDB, and MongoDB.

Role Overview Wise is looking for a Senior Software Engineer to focus on Global KYC (Know Your Customer) and Onboarding systems. This position is based in London and centers on building and improving the software that supports customer verification and onboarding. What You Will Do Design and implement software solutions for KYC and onboarding using Java. Work with cross-functional teams to deliver features that support regulatory compliance and smooth onboarding for customers. Contribute to systems that help Wise meet regulatory standards while keeping customer experience front and center. About Wise Wise is a financial technology company focused on making money movement and financial services easier and more transparent for customers worldwide.

Join our dynamic team at Version 1 as an Intermediate Java Software Engineer. You will play a crucial role in designing, developing, and maintaining high-quality software solutions. Collaborate with cross-functional teams to ensure the delivery of innovative applications that meet both client and business needs.

Join our dynamic team at Wise as a Senior Software Engineer II specializing in Treasury and Liquidity solutions. In this role, you will leverage your expertise in Java to develop innovative software that enhances our financial services. Collaborate with cross-functional teams to deliver high-quality projects that directly impact our global operations and customer experience.

Become a Force for Good with Axon.At Axon, we are committed to the mission of Protecting Life. We tackle society's most urgent safety and justice challenges through our innovative devices and cloud-based software. Our collaborative spirit drives our success as we engage with diverse perspectives from our customers, communities, and each other.Working at Axon is fast-paced, fulfilling, and engaging. You will have the opportunity to take ownership and enact real change while growing in a mission-driven environment where your contributions are valued.Your ImpactAs a Senior Software Engineer within the Infrastructure Services team at Dedrone, you will be tasked with designing, building, and enhancing the core systems that support our developer platform and critical backend services. Your robust software engineering skills coupled with extensive infrastructure knowledge will ensure our platform remains scalable, reliable, and secure. This role transcends traditional infrastructure operations; you will create production-ready backend services, design cloud-native systems, and manage the CI/CD and runtime environments that underpin our product ecosystem. Your influence will shape engineering standards, enhance developer experiences, and steer architectural decisions across Dedrone’s product teams.What You’ll DoWork Location: This position is situated in our London office following a hybrid work model. We emphasize in-person collaboration, requiring team members to be on-site from Tuesday to Friday, with the flexibility for remote work on Mondays, unless a workplace accommodation is in place. We believe that connection drives innovation, and our in-office culture is crafted to promote meaningful teamwork, mentorship, and collective success.Reports to: Engineering Manager, Infrastructure ServicesBackend & Platform Service EngineeringDesign, construct, and sustain production-grade backend services (primarily using Java, Go, or Python) that facilitate deployment orchestration, internal APIs, and developer platform functionalities.Contribute to architectural decisions encompassing service boundaries, API design, persistence layers, scalability strategies, and fault tolerance.Enhance performance, reliability, and maintainability of platform services through rigorous testing practices and meticulous system design.Manage and evolve shared services governed by the Infrastructure Services team.CI/CD & Developer PlatformOwn, design, and refine CI/CD systems that support Dedrone’s distributed product ecosystem.

Role overview The Senior Software Engineer I at Runna will play a key part in shaping how users interact with the company’s products. The work centers on designing, developing, and maintaining applications that support a strong user experience. Expect to take a hands-on approach, working closely with colleagues from different teams to deliver solutions that scale and perform reliably. Location This role is based at the Runna office in London.

About the Contacts Team Role Wise is looking for a Senior Software Engineer II to join the Contacts Team in London. This position focuses on building and improving Java-based applications that support the company’s core products. What You Will Do Work closely with engineers, product managers, and other stakeholders to design and implement software solutions. Develop and maintain high-performance Java applications that respond efficiently to front-end requests. Promote best practices in code quality, testing, and agile development within the team. Who We’re Looking For Significant experience with Java in a production environment. Comfort working with cross-functional teams. Strong interest in building reliable, scalable systems.

Join Axon and become a Force for Good.At Axon, we are dedicated to Protecting Life. Our mission drives us to tackle society's most pressing safety and justice challenges through our innovative ecosystem of devices and cloud-based software. We believe in collaboration, openness, and the value of diverse perspectives from our customers, communities, and each other.Life at Axon is dynamic, demanding, and impactful. Here, you will take ownership of your work and instigate tangible change. Experience continuous growth while contributing to a mission that truly matters, at a company that values your contributions.Your ImpactThis position is ideal for innovators who thrive in a startup-like environment. In Axon's Global Artificial Intelligence division, you will develop a groundbreaking product with a small, dedicated team, aiming to deliver something unprecedented to the market swiftly.As a Senior Software Engineer I, you will spearhead critical aspects of the product from conception to launch. You will make informed architectural decisions, maintain high quality while accelerating development, and assist the team in transforming prototypes into a scalable solution.This role is fundamentally AI-driven: AI will be integral to your delivery approach, not merely an addition.What You’ll DoOversee the development of significant product features and services; manage end-to-end ownership from design through to operations.Clarify product direction amidst uncertainty: articulate the problem, define MVP scope, establish success metrics, and ensure stakeholder alignment on project completion criteria.Create and deploy software using AI methodologies across the Software Development Life Cycle (SDLC), with thorough validation practices to ensure accuracy and quality.Utilize engineering metrics (lead time, PR throughput, defect rates, test coverage, incident load) to assess and enhance delivery outcomes, refining team shipping processes.Make architectural choices that effectively balance speed and scalability, recognizing when temporary solutions become permanent.Implement and uphold engineering best practices that enhance productivity (testing strategies, CI/CD, observability, and sensible release methodologies).Collaborate closely with Product and Design teams (and function effectively in their absence) to prioritize, sequence, and deliver the highest-value increments.Mentor fellow engineers while fostering a culture of trust and ownership.

Join Axon as a Senior Software Engineer I and be at the forefront of developing innovative software solutions that enhance public safety. You will leverage your expertise to design, build, and maintain software systems that have a meaningful impact.

Role overview Wise is looking for a Senior Software Engineer I focused on reliability to help strengthen the stability and performance of our platforms. This role centers on building and maintaining scalable systems that support our global customer base. What you will do Work closely with engineers and other team members to design solutions that improve service reliability. Develop and maintain systems that handle growth and changing demands. Contribute to ongoing efforts to monitor, optimize, and ensure the performance of our services. Location This position is based in London.

Join Assystem as a Senior EC&I Engineer, where you will play a critical role in delivering innovative engineering solutions within the energy sector. You will be responsible for designing, implementing, and managing electrical, control, and instrumentation systems that contribute to the efficiency and safety of power generation projects.Your expertise will facilitate the integration of cutting-edge technology, ensuring compliance with industry standards while fostering a collaborative environment. This is an excellent opportunity for professionals looking to advance their careers in a dynamic and supportive workplace.

About ITRSRecognized as a Great Place to Work, ITRS is a leading Enterprise SaaS provider delivering innovative solutions that ensure critical technologies operate with efficiency. Our mission is to empower organizations through comprehensive and automated IT observability solutions that protect essential applications while fostering innovation.Our esteemed clientele includes 90% of the world’s foremost investment banks, and we are supported by top-tier private equity investors, driving our rapid growth.Our headquarters is situated in Shoreditch, the vibrant tech hub of London, with additional offices across the UK and globally, from the Netherlands to Manila, New York City, and Chicago. We take pride in cultivating a diverse, friendly, and dynamic culture, emphasizing internal promotions and the development of our team members.Role OverviewITRS is seeking a Senior Java Software Developer to join our London-based Platform Team, reporting directly to the Engineering Manager. As part of a larger global Engineering Team, you will contribute to our Core Platform layer, which consists of distributed services designed to ingest, transform, and materialize observability data. This data will then be made accessible to various distributed applications focused on visualization, integration, analytics, and other domain-specific solutions. We aim to enhance our core platform team in preparation for increased customer adoption projected through 2025.This is a permanent, full-time position with a hybrid work schedule based in our London office.Key ResponsibilitiesEngage in all stages of the product lifecycle, including design, development, documentation, testing, integration, deployment, and ongoing support.Mentor team members to foster a culture of mutual growth and learning.Approach product and client challenges with a curious mindset, striving for a thorough understanding of our solutions.Collaborate with team members to craft innovative, customer-focused solutions.Participate in team support responsibilities to ensure reliable service delivery to our clients.Champion a quality-driven culture, offering guidance and support in best practices to less experienced team members.First 30 Days Goals:Gain a comprehensive understanding of our company, team dynamics, and product offerings.Complete hands-on training with ITRS Analytics and other products within our portfolio.Follow an onboarding checklist and connect with team members across various departments.Engage in meetings, demos, and presentations alongside current team members.Review recorded sales calls to learn about our sales processes.Start taking ownership of parts of the agenda as you become more comfortable.First 60 Days Goals:Continue collaborative work with current team members to deepen understanding and contribution to the team.

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.

Join Starling Bank, the UK's pioneering digital bank, on our mission to revolutionize banking! We have created a modern banking experience, harnessing technology to empower individuals in saving, spending, and managing their finances effectively.As a fully licensed bank, we embody the innovative spirit of a tech company, striving to make banking fairer, simpler, and more accessible for everyone. With over 3,000 employees across our offices in London, Southampton, Cardiff, and Manchester, we are at the forefront of the fintech industry.Our engineers are the heartbeat of Starling, thriving in a dynamic environment focused on building and innovating with cutting-edge technology. Our flat organizational structure encourages you to take initiative and collaborate, ensuring you have the support you need to excel.Success at Starling requires a proactive mindset and a commitment to ownership—be it through developing, designing, discovering, or sharing insights with your peers. Our mission aligns with five core values: Listen, Keep It Simple, Do The Right Thing, Own It, and Aim For Greatness.Hybrid WorkingWe embrace a hybrid work model at Starling, favoring candidates within a commutable distance of our offices for optimal collaboration and interaction.Engineering EnvironmentOur engineers eagerly contribute to delivering innovative features, regardless of their primary tech stack. Explore our insights through our latest blogs and case studies featuring Women in Tech.We value engagement and commitment to our customers, as well as the quality of code produced. Those who can tackle diverse challenges and collaborate across teams are vital in our mission to reshape banking for the better.

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.