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Experience Level
Experience
Qualifications
Proven experience in backend development using technologies such as Node.js, Python, or Java. Strong understanding of database management systems like MySQL, PostgreSQL, or MongoDB. Experience with RESTful API design and implementation. Familiarity with cloud services and microservices architecture. Ability to work collaboratively in an Agile environment. Excellent problem-solving skills and attention to detail.
About the job
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.
About airapps
airapps is an innovative technology company based in the heart of London, dedicated to transforming the way businesses leverage technology. Our team is passionate about creating cutting-edge solutions that drive efficiency and growth. Join us as we shape the future of digital transformation.
At Octopus Energy, we began with an audacious vision: to establish the UK's first fully digital energy supplier. Our journey has been driven by cutting-edge technology and a passionate team dedicated to customer satisfaction and the green energy transition. In 2025, we proudly became Britain's largest energy supplier.Today, we are rapidly expanding, developi…
Join Octopus Energy, a pioneering force in the renewable energy sector, where we are redefining how energy is supplied in Britain. Our mission is to create a fully digital energy experience that empowers our customers while promoting sustainability. With a unique blend of innovative technology and a dedicated team, we have already become the largest energy supplier in the UK. As we expand, we are committed to accelerating the green energy transition through cutting-edge products and services that simplify the switch to renewable solutions such as heat pumps, solar power, and electric vehicles. At Octopus Tech, you will have the opportunity to take ownership of meaningful projects that positively impact lives—by reducing energy costs and enabling eco-friendly living. Collaborating with cross-functional teams, you will witness the immediate results of your work in the real world. As we build a lean and effective TechOps Engineering team, we seek a talented and experienced Full Stack Software Engineer to contribute to our vision. You will play a vital role in shaping the TechOps function, developing self-service technology that enhances our team's ability to leverage advanced tech solutions. TechOps represents a modernized approach to traditional IT, encompassing everything from first-line support to strategic planning. We are looking for someone who will help design and implement efficient, scalable, and robust solutions for our TechOps capabilities. If you are excited about making a difference in the renewable energy landscape, we would love to hear from you!
Join the dynamic field sales team at Octopus Energy as a Venue Sales Representative! We are at the forefront of transforming traditional sales and marketing, focusing on innovative customer interactions that prioritize sustainability. Our mission is to make energy greener and better for everyone. At Octopus Energy, our customers are our top priority. We are seeking passionate individuals who share our commitment to delivering exceptional service! As a Venue Sales Representative, you will represent our brand with enthusiasm and showcase the incredible offerings of Octopus Energy to the public!
At Octopus Energy for Business, we are on a mission to transform the energy landscape for enterprises across the UK. Currently serving over 120,000 clients, we are just getting started!We are revolutionizing the energy market by eliminating middlemen, offering exceptional value, unparalleled customer service, and innovative products like Shape Shifters and Electric Match that empower businesses to manage their energy effectively.As a proud member of the Octopus Energy Group, we leverage cutting-edge technology, renewable energy, and flexibility to help companies reduce both costs and carbon emissions simultaneously.Now, we are eager to amplify our reach and let more businesses discover a superior alternative—and that’s where your expertise comes in.This is a hybrid role, requiring your presence in our London office typically three days a week.
Location: Hammersmith, London Department: ITAssala Energy is a forward-thinking Oil and Gas Exploration and Production company dedicated to the sustainable development of its valuable assets in Gabon. We embrace a collaborative culture, champion diversity, and prioritize safety and integrity in every aspect of our operations.We are seeking a Senior Network Engineer to become a vital member of our IT team, responsible for maintaining and enhancing our global network infrastructure. In this role, you will ensure network stability, security, and efficiency across our operations while spearheading improvements and innovative solutions.
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.
Full-time|Hybrid|London, England, United Kingdom (Hybrid)
Join commercetools as a Senior Backend Engineer, where you will play a pivotal role in shaping innovative backend solutions using TypeScript. Collaborate with cross-functional teams to create scalable and resilient microservices that empower our clients to deliver exceptional digital commerce experiences.
About 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.
Join Our Dynamic Team at XapienAt Xapien, we empower businesses to truly understand their connections with suppliers, investors, partners, and third parties. Our innovative approach merges speed, scale, and precision, utilizing advanced AI technology.Since our inception in 2018, we've evolved from a deep-tech startup to a key player in AI-driven due diligence and risk intelligence. The year 2024 marked a significant milestone, with the successful closure of a $10M Series A funding round and accolades in the Chartis RiskTech100® and Everest Group’s Leading 50™. Our expansion has led to a broader product range, new market entries, and an expanding customer base.Our Growth TrajectoryWe're witnessing accelerated demand across various industries, especially in wealth management, financial services, and supply chain onboarding, extending our reach beyond the UK to customers in the Middle East, Asia, and Oceania.Why Now is the Perfect Time to Join UsThis position is not just another role; it’s a chance to influence the future of the due diligence sector with a market-leading product that organizations worldwide trust. Whether your expertise lies in marketing, communications, sales, or finance, your contributions will be vital in driving growth, enhancing credibility, and connecting our product with a swiftly changing market.As we scale rapidly, with an increasing number of customers and product releases, we face larger regulatory and market challenges. The expectation for real-time insights in due diligence is higher than ever. Your role will go beyond routine tasks; you will be shaping strategy, refining processes, and positioning a brand that is redefining trust and transparency.If you're passionate about learning, innovating, and making a meaningful impact, now is the time to join Xapien.The RoleWe are seeking a skilled Senior Backend Engineer to take on a pivotal technical leadership role within our engineering team. You will tackle our most complex technical challenges, take ownership of critical components within our platform’s architecture, and help guide our technical direction to ensure we continue to stay ahead in the industry.
About UsAre you ready to embark on a thrilling challenge?At XYZ Reality, a dynamic and award-winning Series-A startup, we're on a rapid ascent toward our next funding milestone. Our vision is to revolutionize the construction sector by enhancing our platform's features, performance, and scalability.We thrive in a fast-paced, multi-disciplinary environment, engaging in various domains such as cloud development, electronics, embedded software/hardware, mechanical design/manufacturing, AI & computer vision, and data science—all contributing to our innovative BIM Platform.To propel this mission forward, we are in search of a Backend Engineer with extensive Node.js experience to assist in our transition from Java to Node.js and develop high-performance, scalable backend services. You will collaborate closely with our API development, client applications, and data pipeline teams to design and deliver robust, efficient solutions.Our office is situated in central London, just a short stroll from Angel Station.
We are seeking an experienced and passionate Senior Backend Engineer specializing in TypeScript to join our dynamic software engineering team at onrunning. In this pivotal role, you will lead the design and development of robust backend systems that power our innovative applications. You will collaborate closely with cross-functional teams to deliver high-quality solutions that meet the needs of our users. If you have a strong background in backend development, a love for building scalable systems, and a desire to drive technical excellence, we want to hear from you!
What We Do: Electric Car LeasingWhy We Do It: Greener. Fairer. Future.We are excited to invite applications for the role of Senior Account Manager to join our dynamic Customer Success team in London. This essential position is focused on cultivating the commercial success of our valued customer relationships.As a Senior Account Manager, you will assume full responsibility for a high-value enterprise portfolio, delivering our industry-leading EV salary sacrifice scheme. Your key responsibilities will include developing multi-year growth strategies, mitigating commercial risks, and ensuring maximum scheme adoption along with long-term client retention.This role demands a strong presence, exceptional commercial insight, and a steadfast dedication to transforming our mission of sustainable transport into measurable outcomes for both our corporate partners and Octopus Electric Vehicles.Please be advised that a valid UK driving licence is required for this position.
Full-time|Hybrid|Remote — London, England, United Kingdom
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.
Affinidi develops technology that helps people and organizations manage their data with greater control. The team designs digital identity tools that keep privacy and security at the forefront. Their work emphasizes decentralized approaches, aiming to make digital credentials both secure and accessible across industries and borders. Role overview The Senior Backend Engineer (Rust) position focuses on building and refining backend systems for privacy-first digital identity products. This London-based role plays a key part in supporting secure, reliable services that underpin Affinidi's core offerings. What you will do Develop and maintain backend services using Rust Create technical solutions that enhance efficiency and reliability Support the ongoing development of decentralized identity platforms Location London, England, United Kingdom
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.
Last Energy, a pioneering force in the energy sector, is on the lookout for a dedicated Commercial Associate with a robust background in the power or energy industry. This pivotal role will focus on advancing capital formation, enhancing investor relations, and spearheading project-specific financial initiatives. You will be instrumental in supporting our strategic financing objectives and will gradually take charge of comprehensive commercial opportunities. The ideal candidate will possess exceptional analytical and financial acumen, coupled with a talent for fostering enduring relationships with investors and partners.
Transform the Future of Finance.At Light, we are revolutionizing the outdated ERP systems of the factory era with innovative software that feels dynamic and responsive. Our Smart Financial Platform empowers modern, global enterprises with automated accounting, instantaneous reporting, and financial processes that adapt to the pace of business.We're passionate about collaborating with our clients, delivering swiftly, and perfecting our craft. In a short span, Light has evolved from a concept to an essential operational tool for renowned companies such as Lovable, Legora, and Keyshot. Our users don’t just utilize Light—they genuinely enjoy the experience.As a pioneering team, we are establishing a new software category. We are looking for engineers who appreciate the intricacies of debits and credits, designers who prioritize reconciliation states, and operators who view finance as a product. If you are eager to modernize the financial landscape—one workflow at a time—you belong here.Supported by prestigious investors and guided by industry leaders, we are crafting products that define categories, allowing us to innovate boldly and take ownership of our results. Join us in our mission to make Light the global standard for next-generation financial solutions.Your Role as a Backend Engineer:Enhance our core Smart Financial Platform, enabling multinational corporations to streamline their accounting processes through AI and exceptional user experience.Maintain a strong focus on customer requirements while architecting robust and scalable technical solutions.Develop and optimize backend services, APIs, and infrastructure to support our high-performance frontend applications.
About XapienAt Xapien, we redefine the landscape of due diligence by empowering businesses with essential insights about their suppliers, investors, partners, and third parties. Our innovative approach integrates speed, scale, and precision through advanced AI technology.Since our inception in 2018, we have evolved from a deep-tech startup into a significant global player in AI-enhanced due diligence and risk intelligence. The year 2024 marked a pivotal moment for us, as we secured a $10 million Series A funding, achieved accolades in the Chartis RiskTech100® and Everest Group’s Leading 50™, and broadened our product offerings and market reach.Looking ahead to 2025, we are poised for even greater achievements. As organizations face mounting compliance demands and heightened reputational risks, they are increasingly seeking intelligent, efficient solutions—turning to Xapien for rapid, reliable insights that transform days of manual research into actionable intelligence in mere minutes.Our Growth JourneyWe are proud to serve customers across a multitude of industries, with notable expansion in wealth management, financial services, and supply chain onboarding. Our reach extends beyond the UK, with a growing clientele in the Middle East, Asia, and Oceania.Why Join Us Now?This role offers a unique opportunity to influence the future of the due diligence industry with a leading product that global organizations trust. Regardless of your background—be it marketing, communications, sales, or finance—you will play a vital role in driving growth, enhancing credibility, and connecting our product with an ever-evolving market landscape.As we scale rapidly, with increasing customer demand, product releases, and complex regulatory challenges, the stakes are higher than ever. Due diligence now demands instantaneous insights that are delivered effectively and impactfully. Your contributions will transcend traditional roles, as you will help shape strategies, refine processes, and elevate a brand that is setting new benchmarks for trust and transparency.For those passionate about learning, innovating, and making a significant impact, now is the perfect time to join Xapien.The PositionWe are in search of a Senior Backend Engineer to become a pivotal member of our engineering team, tackling some of our most complex technical challenges. You will be responsible for owning critical components of our platform’s architecture, driving innovation and quality in our backend systems.
Join Fuse Energy, a pioneering renewable energy startup, as we strive to deliver a terawatt of renewable energy swiftly and effectively. By merging foundational thinking with innovative technology, we aim to construct a significantly improved energy system. Our recent funding of $170M from esteemed investors like Multicoin, Balderton, Lakestar, Accel, Creandum, Lowercarbon, Ribbit, and influential angels such as Nico Rosberg, co-founder of Solana, highlights our ambitious vision.We’re on a mission to create a fully integrated energy company. Our endeavors span across developing solar, wind, and hydrogen projects, as well as real-time power trading and distributed energy installations. By selling directly to consumers, we eliminate intermediaries, reduce costs, and pass those savings onto our customers.Moreover, we’re constructing the Energy Network: a decentralized platform of smart devices that incentivizes users with Energy Dollars for electrifying their homes, shifting usage to off-peak hours, and aiding in grid stability. This network plays a vital role in enhancing grid reliability, a cornerstone for scaling AI data centers and other energy-intensive sectors.As we advance towards innovative technologies and sustainable energy solutions, we are in search of a dynamic Electrical Engineer who possesses a wide-ranging engineering interest and is fervent about tackling complex challenges in the renewable energy arena. This position transcends conventional engineering duties, as you will engage in technical problem-solving and renewable energy engineering while also spearheading business development, market research, and techno-feasibility assessments.
