Senior Software Engineer I

Join our innovative team at Kaluza as a Senior Software Engineer I, where you will play a crucial role in shaping the future of energy technology. You will collaborate with talented engineers to design and implement software solutions that enhance our platform's scalability and performance.

Senior Android Software EngineerAt Deliveroo, we are on a mission to revolutionize the shopping and dining experience, powered by our commitment to impact, innovation, and growth. Our Engineering teams face complex technical challenges in a global, three-sided marketplace, creating and enhancing systems that serve millions of customers, riders, and partners every day.From real-time logistics to robust infrastructure and marketplace optimization, we design, build, and maintain technology that fuels Deliveroo’s expansive growth.We are seeking a Senior Android Software Engineer to join our dynamic team in London. In this role, you will contribute to the development and scalability of our top-tier mobile applications, ensuring an uninterrupted and high-performance experience for our diverse user base. This position is based in our London office with a hybrid work arrangement, typically requiring three days in the office.Explore our Engineering team to learn about what motivates us, our collaborative work environment, and what you can expect from us.Your ResponsibilitiesAs a member of the Consumer Tech team, you will focus on the complete customer journey—from the moment they launch the app to when their meal arrives—ensuring each interaction is seamless, quick, and dependable.Your daily activities will include:Lead technical execution by designing, developing, and scaling Android applications that manage complex, real-time interactions on a global scale.Enhance architectural frameworks and conduct code reviews to ensure the maintainability, visibility, and operational health of our mobile codebase.Collaborate with cross-functional teams (PMs, Experience Designers) to plan projects, guide technical decisions, and influence the team’s roadmap.Take ownership of large-scale features from conception to delivery, streamlining maintenance and ensuring operational readiness across our production systems.Foster the development of team members by mentoring peers, promoting efficiency, and actively participating in the engineering hiring process.What We’re Looking ForThe ideal candidate will possess substantial expertise in several of the following areas, with an eagerness to expand their knowledge in others:Extensive experience in developing Android applications, showcasing a robust understanding of the platform and its ecosystem.

Do you have the passion to drive innovation? Join AnyVan and revolutionize the way we move anything, anywhere while building a fulfilling career that accelerates with every challenge. Founded in 2009 by our visionary CEO Angus, AnyVan emerged from the need to optimize logistics by utilizing underused van space. Our mission is to transform logistics technology, dramatically reducing wasted journeys and carbon emissions. With over 150,000 five-star reviews and a customer base exceeding 5 million across the UK and Europe, we are proud to be the preferred choice for countless users. Our dedicated team of 400 AnyVanners, operating from London, Cape Town, and Bogota, is committed to reducing carbon emissions by 8,520 tonnes annually. Be at the forefront of logistics innovationAt the core of our operations is a cutting-edge optimization platform that seamlessly connects customer needs with real-time driver availability, enabling us to provide exceptional service at unbeatable rates.By efficiently matching jobs with drivers already on the road, we minimize unnecessary miles, reduce emissions, and ensure fair earnings for our drivers. It’s a complex interplay of logistics, pricing, and marketplace dynamics, all powered by advanced software.And this is just the beginning...As we embark on the next phase of development, we're transitioning our platform to a truly intelligent logistics marketplace. Your role will involve designing and building systems to:Accurately model job-level costs in real time, paving the way for smarter, more dynamic pricing strategies.Enhance our driver platform, integrating it deeper into their daily operations and unlocking new revenue streams.Establish a two-sided marketplace, facilitating the buying and selling of non-core jobs among drivers to optimize utilization.Scale efficiently as we grow in volume, complexity, and ambition.This position is ideal for engineers who thrive on tackling complex, high-impact challenges and shaping the evolution of a scalable platform.

Why Verifone For over four decades, Verifone has been at the forefront of the electronic payment technology industry, establishing itself as a leader and a trusted name in electronic payment solutions. As one of the largest providers of payment systems globally, we take pride in our innovative approach to delivering exceptional payment solutions. At Verifone, our work environment is diverse, dynamic, and fast-paced, where results matter. We work closely with leading retailers, merchants, banks, and partners to design and implement groundbreaking payment solutions worldwide. Our commitment to excellence and customer satisfaction drives our team, fostering a culture of innovation and ambition that empowers every employee to achieve both personal and professional success. About The Role We are on the lookout for a Senior Software Engineer (Node.js / TypeScript) based in London to develop and maintain backend services that support payment, checkout, and transactional workflows. This role involves close collaboration with Product, Frontend, Platform, and Infrastructure teams to create secure and scalable APIs within high-throughput environments. Your contributions will be pivotal to Verifone’s payments and checkout platform, where backend engineering plays a crucial role in facilitating secure and high-volume transactions on a global scale. You will design and manage scalable, production-critical systems that must perform reliably under real-world conditions, adapt to evolving payment methods, and meet strict security standards.

Join Aircall, a leading unicorn in the customer communications sector, revolutionizing the way businesses connect with their customers. Our AI-powered platform, trusted by over 22,000 companies globally, integrates voice, SMS, WhatsApp, and AI into a single cohesive workspace, enhancing revenue generation, expediting issue resolution, and empowering customer-facing teams.At Aircall, we believe in working smarter, not harder. Our AI Voice Agent automates routine calls, AI Assist simplifies post-call tasks, and AI Assist Pro offers real-time support, enabling teams to perform at their best. This innovation leads to increased revenue, quicker resolutions, and scalable teams.Headquartered in Paris, with a robust presence in North America centered in Seattle, Aircall has teams across various cities including Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We have crafted a beloved product and a rapidly growing business, supported by top-tier investors and driven by swift AI advancements across our offerings.At Aircall, you will become part of a dynamic and ambitious organization, where product excellence and execution are paramount. We prioritize swift decision-making, visible impact, and genuine growth.Our Work Culture: We are dedicated to our customers, rely on data-driven insights, and are focused on delivering impactful results. We value responsibility, continuous learning, and thoughtful speed. If you thrive in a collaborative, fast-paced environment where trust and impact are essential, you'll fit right in.We are seeking a motivated and passionate Senior Software Engineer to join our expanding engineering team and contribute to our innovative projects.In this role, you will be responsible for the design, development, deployment, and operation of critical features that enhance customer satisfaction. You will focus on operational excellence, metrics, observability, and best practices while mentoring your peers within the engineering team.With a commitment to quality, excellence, and agility, you will help elevate our delivery processes. Utilizing a NodeJS and Typescript back-end stack hosted on AWS, you will ensure that our solutions meet the highest standards.

Join PhysicsX as a Senior Software Engineer specializing in our AI Workbench. In this pivotal role, you will lead the development of cutting-edge artificial intelligence solutions that empower our clients to harness the full potential of data and analytics. Your expertise will contribute to the design and implementation of scalable software architectures, ensuring robust performance and reliability. You will collaborate with cross-functional teams to define project requirements and engage in hands-on coding, code reviews, and mentoring junior engineers. If you are passionate about AI and eager to push the boundaries of technology, we want to hear from you!

Join Our Team!Are you an innovative Senior Software Engineer looking to make a significant impact? At Perk, we are redefining the landscape of travel and spend management with our intelligent platform. Our mission is to eliminate the tedious manual tasks that hinder productivity, allowing professionals to focus on what truly matters.Since our establishment in 2015, we've grown to serve over 10,000 companies globally, including renowned names like Wise, On Running, and Breitling. Our cutting-edge tools streamline everything from travel bookings to expense management, addressing a staggering $1.7 trillion problem of lost productivity.With a vibrant workforce of over 1,800 talented individuals across 12 offices, we are committed to fostering innovation and enhancing workplace culture. We believe in the power of curiosity, purpose, and teamwork, and we want you to be part of our journey to transform how businesses operate.

Role Overview Talan is looking for a C# Developer in London. This role focuses on building, testing, and maintaining reliable software applications using C#. The position involves hands-on programming and close collaboration with colleagues from different teams. What You Will Do Develop and maintain software applications in C# Test new features and ensure software quality Work with cross-functional teams to gather requirements and design architecture Help implement systems that align with business goals Location This position is based in London.

About AirwallexAirwallex stands as the sole unified payments and financial platform tailored for global enterprises. Leveraging our unique blend of proprietary infrastructure and innovative software, we empower over 200,000 businesses globally—such as Brex, Rippling, Navan, Qantas, and SHEIN—with comprehensive solutions for managing everything from business accounts and payments to spend management, treasury, and embedded finance on a worldwide scale.Founded in Melbourne, we proudly boast a team of over 2,000 of the most talented and inventive minds in technology across 26 offices worldwide. With a valuation of US$8 billion and the support of top-tier investors including T. Rowe Price, Visa, Mastercard, Robinhood Ventures, Sequoia, Salesforce Ventures, DST Global, and Lone Pine Capital, Airwallex is at the forefront of creating the global payments and financial platform of tomorrow. If you're ready to embark on the most ambitious journey of your career, we invite you to join us.Attributes We ValueWe seek builders who possess founder-like energy and desire to make a tangible impact, accelerate their learning, and gain true ownership. You bring substantial role-related expertise and sharp analytical thinking, motivated by our mission and operating principles. You act swiftly with sound judgment, explore deeply with curiosity, and make decisions grounded in first principles, maintaining a balance between speed and thoroughness.You demonstrate humility and collaboration by transforming zero-to-one ideas into tangible products, ensuring that you 'get things done' from start to finish. Utilizing AI, you work smarter and solve problems more efficiently. Here, you will confront complex, high-visibility challenges alongside exceptional teammates while advancing your career as we shape the future of global banking. If this resonates with you, let’s build what’s next together.What the Scale Team DoesEmbedded Finance Platform: Design and maintain the multi-tenant infrastructure that supports enterprises like Rippling, Navan, Qantas, and SHEIN. You will architect systems that consolidate requests from all platform clients, ensuring enterprise-grade SLAs for availability, latency, and throughput while managing cross-data-center scenarios.Cross-Domain Product Features: Own features requiring a synthesis of knowledge across business, regulatory, and technical domains—areas where no single existing team has complete coverage, such as tax systems, compliance-driven flows, or monetization tools.Solutions Architecture: Design integrations for enterprise prospects to enhance operational efficiency and drive growth.

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.

Join Us in Supporting the UK's Small Businesses! At Funding Circle, we believe small businesses are the backbone of the economy, and we’re dedicated to helping them succeed. Our innovative platform utilizes advanced data analysis to secure funding in minutes rather than weeks.We combine the dynamism of a fintech start-up with the reliability of a publicly traded company, providing our team members—known as Circlers—with a unique blend of autonomy and the opportunity to make a meaningful impact.Our high-performing team fosters a culture of support and collaboration. We challenge each other, celebrate successes, and understand that united, we can drive progress and enhance our outcomes.The impact is tangible: Last year, businesses using our platform contributed £7.2bn to the UK economy Join a mission that truly matters![Explore our Impact Report] | [Check our Trustpilot reviews]Your Role London (Hybrid) | 2 days in the office | Competitive Salary + BenefitsWe are seeking a Senior Software Engineer to become part of our Accounts & Cards team.As a member of our collaborative Credit Risk Platform team within the Core Services department, you will focus on enhancing our proprietary decision engine, which is vital to our application process. You will collaborate with talented peers to deepen your understanding of our credit strategy and the software systems that underpin it. This is a fantastic opportunity to create a significant impact while furthering your skills in a culture that champions innovation, teamwork, and collective success.You thrive on building new solutions and are comfortable navigating legacy codebases. You enjoy tackling complex problems with straightforward software systems.You have a background in Functional Programming, microservices, and/or event-driven architecture.You are a team player who promotes collaborative work and believes that teamwork leads to smarter outcomes.Your skills in coding and problem-solving will be essential in driving our projects forward.

Role Overview Legal & General is looking for a Senior Fullstack Software Engineer to help shape the future of our retirement services. This role focuses on designing and building software that supports and improves our products for customers in retirement. What You Will Do Develop and maintain software solutions across the stack to support retirement services Work closely with teams from different disciplines to deliver new features and improvements Contribute to technical decisions that raise the bar for quality and performance Focus on delivering reliable, maintainable code that enhances user experience Location This position is based in London.

Role overview Axon Enterprise, Inc. is seeking a Senior Software Engineer II to join its London office. This position centers on developing software that directly supports public safety and serves communities. Engineers at Axon play a key part in building solutions designed to grow and adapt alongside evolving needs. Key responsibilities Collaborate with engineers from diverse backgrounds to design and build software products Develop and enhance systems that assist public safety professionals in their daily responsibilities Share ideas and contribute code in a setting that values technical input and encourages new perspectives Work environment The engineering group values both initiative and teamwork. Creativity and practical problem-solving are woven into daily routines, and the team moves quickly to deliver results that matter.

At Ripple, we are on a mission to transform how value is transferred globally, akin to the speed and ease of information today. Our innovative cryptocurrency solutions for financial institutions, businesses, governments, and developers are revolutionizing the financial landscape, fostering economic equality and opportunities worldwide. Join us in doing the most meaningful work of your career, while developing your skills in a supportive environment.If you're eager to make a significant impact and explore remarkable career advancement opportunities, we invite you to join us in creating real-world value.YOUR ROLE:As part of RippleX, we focus on empowering the innovators of tomorrow on the XRP Ledger (XRPL), one of the fastest and most dependable public blockchains globally. We are committed to democratizing the digital economy by offering essential support, fostering a community of developers, and leveraging our technological expertise.The XRPL is a decentralized public blockchain, backed by a worldwide network of businesses and developers dedicated to solving challenges and generating value. With over a decade of operational reliability and the successful processing of more than 100 million ledgers, the XRPL provides efficient development, minimal transaction costs, superior performance, and sustainability.We are looking for driven engineering managers who share our vision and bring technical proficiency to lead teams in enhancing XRPL's core architecture and facilitating developer contributions.KEY RESPONSIBILITIES:Deliver technical and strategic leadership for RippleX's blockchain software, ensuring its scalability and reliability.Create and implement roadmaps to drive technical and operational excellence.Mentor and guide team members towards professional and technical development while providing hands-on leadership.Establish and promote engineering standard processes, collaborating with partners across Ripple and within the XRPL community.Implement agile methodologies to foster innovation and achieve incremental objectives.Effectively communicate technical concepts to diverse audiences, including engineers, business leaders, and technical executives.Expand the team by attracting and mentoring leaders and engineers of varying experience levels.Collaborate with Ripple’s recruitment team to hire top-tier engineers.QUALIFICATIONS:10+ years of experience in software engineering with a focus on blockchain technology.Proven track record of leading engineering teams and delivering successful software projects.Strong understanding of blockchain principles, decentralized systems, and smart contracts.Excellent communication skills with the ability to convey complex technical concepts clearly.Experience with agile development processes.Ability to mentor and develop junior engineers effectively.Passion for innovation and driving impactful change.

Ebury empowers ambitious businesses to unlock global growth, while fostering a culture of innovation and collaboration among our team members. We believe in creating an inclusive environment where everyone is valued, supported, and encouraged to thrive.If you are a collaborative thinker eager to transform business operations on a global scale, reach out to us. We would love to explore how Ebury can accelerate your career and enable you to shape the future.Position: Senior Software Engineer - Enabling TeamsLocation: London Office - Hybrid: 4 days in office, 1 day remoteEbury is on the lookout for outstanding and driven software engineers to join our engineering team in London. This is a fantastic opportunity to make a meaningful impact within a leading FinTech firm. As a Senior Software Engineer, you will play a pivotal role from day one, contributing to critical projects and deploying production code within your first week.In this role, you will assume considerable responsibility, autonomy, and ownership over large-scale, mission-critical services, products, and platforms. Ebury is dedicated to identifying and nurturing future technical leaders; for those who demonstrate exceptional performance and aptitude, we provide an accelerated career progression pathway.

As a Senior Manager of Software Engineering at Socure, you'll lead a dynamic team of engineers to develop innovative software solutions that enhance our identity verification platform. You will be instrumental in setting the technical direction, driving project timelines, and ensuring the successful delivery of high-quality software products. Your leadership will foster a culture of collaboration, agility, and excellence.

Role overview LMAX seeks a C++ and Python Developer to join its Middle-Office Team in London. This group works alongside infrastructure, research, and treasury teams to advance trade reconciliation, back-testing frameworks, and trading monitoring systems. The main focus lies in data engineering and building trading systems from the ground up. Prior experience in finance or trading is not required for this position. Team approach The team operates at the intersection of C++ and Python. C++ powers the infrastructure, while Python supports research tasks like analysis and automation. Bridging these languages is central to the role, supporting integration and collaboration across disciplines. Performance and optimization Managing financial data introduces technical challenges, particularly around throughput. The team values software performance but never at the expense of maintainability. Developers work closely with the codebase to understand, optimize, and refine systems. Testing practices Comprehensive testing is a core part of the workflow. The team maintains test suites that include unit tests and full end-to-end simulations. Continuous integration runs these tests every 15 minutes, ensuring rapid feedback and no overnight waits for results. What you will do Write clear, well-structured, and thoroughly tested code in C++ and Python Develop software solutions that handle high throughput Pair program to share knowledge and prevent silos Design and implement features to enhance safety, performance, and usability Create interface code connecting C++ and Python using pybind Requirements Strong C++ skills, especially with modern C++ on Linux or UNIX Python development experience, including Numpy, Pandas, and SQL Experience with automated testing for both C++ and Python Ability to interpret business requirements and build effective systems Skilled at designing simple, well-documented, and maintainable solutions Comfortable working independently with minimal supervision No finance or trading background needed Bonus skills Experience with test-driven development and testing across multiple system levels Location This position is based in London, England, United Kingdom.

Join our dynamic team at PhysicsX as a Senior Software Engineer specializing in Platform Runtime. In this pivotal role, you will lead the design and implementation of our software platform, ensuring high performance and scalability. Collaborate with cross-functional teams to create innovative solutions that drive the future of technology.

Join our innovative team at unlikelyai as a Senior Software Engineer, where you will have the opportunity to develop cutting-edge solutions that push the boundaries of artificial intelligence. In this role, you will collaborate with a talented group of professionals, leveraging your expertise to optimize our software development processes and deliver high-quality products.

Join Peregrine Technologies, a forward-thinking company backed by top Silicon Valley investors, as we empower public safety organizations, government agencies, and the private sector to tackle societal challenges with groundbreaking speed and precision. Our AI-driven platform transforms isolated data into actionable intelligence, enabling swift, informed decisions that enhance outcomes at every touchpoint. With a client base spanning over 30 states and two countries, serving more than 125 million people, we are on an exciting trajectory of growth into enterprise and international markets.TeamOur engineering team prioritizes empathy as the key to developing effective solutions. Understanding user interactions with our product is crucial to achieving the best outcomes. As a part of our Foundations team, you will collaborate with detail-oriented engineers focused on driving innovation and enhancing performance through technical excellence. We are responsible for maintaining the performance of our mission-critical infrastructure and spearheading high-stakes initiatives that unlock unprecedented capabilities.We emphasize both ownership and teamwork; you will have full accountability for major features while working closely with fellow engineers to see them through to completion. We believe that humility and empathy are vital for developing the right solutions, and you will engage directly with our deployment team and users to iterate and resolve their challenges. Creativity and perseverance are essential as we strive to execute our vision.RoleAs our first Software Engineer in the UK, you will have significant ownership across our technology stack, making impactful decisions that will shape our future for years to come. You will redefine the capabilities of our data platform by developing innovative features that enhance user experiences and operational efficiencies.