Backend Engineer Jobs in London, UK

<p data-start="57" data-end="185"><strong data-start="57" data-end="91">Senior Backend Engineer – Java</strong><br data-start="91" data-end="94">Location: London (Hybrid) | <strong data-start="122" data-end="139">Practice Area</strong>: Technology & Engineering | Type: Permanent</p> <p data-start="187" data-end="287"><strong data-start="187" data-end="287">Power the platforms behind modern finance. Shape cloud-native solutions with Java at their core.</strong></p> <p data-start="289" data-end="695"><strong data-start="289" data-end="301">The Role</strong><br data-start="301" data-end="304">We’re seeking a Senior Backend Engineer (Java) to join our Technology & Engineering team. You’ll bring expertise in building robust, scalable, cloud-native applications using Java, Spring Boot, and AWS. Working on high-impact platforms for Tier 1 financial institutions, you’ll lead backend design, champion agile best practices, and contribute to the evolution of modern banking technology.</p> <p data-start="697" data-end="715"><strong data-start="697" data-end="715">What You’ll Do</strong></p> <ul data-start="716" data-end="1167"> <li data-start="716" data-end="798"> <p data-start="718" data-end="798">Design and build microservices-based applications using Java 11+ and Spring Boot</p> </li> <li data-start="799" data-end="890"> <p data-start="801" data-end="890">Deliver enterprise-ready cloud solutions, with a focus on AWS infrastructure and services</p> </li> <li data-start="891" data-end="972"> <p data-start="893" data-end="972">Build and manage robust CI/CD pipelines and ensure secure, scalable deployments</p> </li> <li data-start="973" data-end="1058"> <p data-start="975" data-end="1058">Write comprehensive tests and implement quality-driven development across the stack</p> </li> <li data-start="1059" data-end="1167"> <p data-start="1061" data-end="1167">Collaborate in agile teams and contribute to design decisions, troubleshooting, and continuous improvement</p> </li> </ul> <p data-start="1169" data-end="1195"><strong data-start="1169" data-end="1195">What We’re Looking For</strong></p> <ul data-start="1196" data-end="1609"> <li data-start="1196" data-end="

<p><strong>Principal Backend Engineer - Java</strong></p> <p>Location: London (Hybrid) | Type: Permanent</p> <p><strong>The Role</strong></p> <p>Capco is growing our Engineering team – and we’re looking for experienced Principal Backend Engineers with strong Java skills and a passion for delivering innovative solutions in financial services. If you enjoy solving complex problems, working with cloud-native technologies, and collaborating in agile teams, we’d love to hear from you.</p> <p>As a Principal Backend Engineer at Capco, you’ll contribute to high-impact, client-facing projects that shape the future of financial services. You’ll work alongside talented engineers, have access to industry-leading training, and get the opportunity to grow your skills across multiple platforms. You will also get the chance to work across different domains within FS & Energy.</p> <p><strong>What You’ll Do</strong></p> <ul> <li>Build and deliver scalable backend services using Java (11, 17+)</li> <li>Design and implement APIs and microservices for enterprise systems</li> <li>Work across cloud platforms, particularly AWS, using best practice deployment techniques</li> <li>Contribute to architecture discussions and solution design</li> <li>Develop robust test coverage including unit, integration, and performance testing</li> <li>Collaborate in agile teams alongside clients, product managers, and other engineers</li> </ul> <p><strong>What We’re Looking For</strong></p> <ul> <li>Java Development - Expertise in Java 11, 17 and above.</li> <li>Spring Boot - Proficiency with the Spring Boot framework.</li> <li>Cloud Services - Deep understanding of deploying enterprise level software into any public cloud, preferably AWS.</li> <li>Architecture Patterns - Experience implementing microservices, event-driven, CQRS and cloud-native architectures.</li> <li>CI/CD - Strong understanding of CI/CD pipelines, particularly within the AWS ecosystem.</li> <li>Database Management - Proficiency in both SQL and NoSQL databases.</li> <li>Message Brokers - Experience with Kafka.</li> <li>Testing - Ability to write various types of tests including unit, component, integration, end-to-end, and performance tests.</li> <li>Java Streaming - Core understanding of Java streaming and AWS integration.</li> <li>Infrastructure as Code - Experience with CloudFormation or similar tools for infrastructure management.</li> <li>Large-Scale Systems Design - Experience with designing large-scale systems.</li> <li>Distributed Systems Troubleshooting - Ability to troubleshoot distributed systems.</li> </ul> <p><strong>Bonu

Backend Engineer (Mid-Level) at Motorway. Apply via Ashby.

Senior Backend Engineer - London at Junior. Apply via Ashby.

Principal Backend Engineer at Synthesia. Apply via Ashby.

The Subscriptions Mission builds and scales the products, platforms, and business models that convert free listeners into lifelong Premium subscribers. We focus on driving acquisition, optimizing conversion, improving retention, and delivering seamless commerce experiences that fuel Spotify’s growth and bring fans closer to the creators they love. At Spotify, our Subscriptions data powers the decision engines and experiences behind our 700M+ Monthly Active Users and 290M+ Premium subscribers. You’ll join a collaborative, cross-functional team focused on building the systems that power merchandising, personalization, and seamless subscription experiences at global scale. Together, we shape how users discover value and choose to stay with Spotify.  

The Platform team creates the technology that enables Spotify to learn quickly and scale easily, enabling rapid growth in our users and our business around the globe. Spanning many disciplines, we work to make the business work; creating the infrastructure, tooling, frameworks, and capabilities needed to welcome a billion customers. You will join the Release squad within our Client Platform Studio in the Platform mission. This team builds the tools, systems, and workflows that enable Spotify engineers to release software safely, quickly, and with confidence. We focus on reliability, developer productivity, and standardization—powering the invisible machinery behind Spotify’s engineering experience. You’ll work on internal platforms that impact thousands of engineers and directly shape how software gets delivered at scale.

We are AMS. We are a global total workforce solutions firm; we enable organisations to thrive in an age of constant change by building, re-shaping, and optimising workforces. Our Contingent Workforce Solutions (CWS) is one of our service offerings; we act as an extension of our clients' recruitment team and provide professional interim and temporary resources. Our client, a major UK retail bank, provides every day banking services to over 17 mil...

Software Engineer III - Backend Engineering - Java/Kotlin 210588623 T15:57:16+00:00 London Software Engineering Full time Out of the successful launch of Chase in 2021, we're a new team, with a new mission. We're creating products that solve real world problems and put customers at the center - all in an environment that nurtures skills and helps you realize your potential. Our team is key to our success. We're people-first. We value collaborati...

Senior Lead Software Engineer- Backend Engineer - Chase UK 210591504 T10:26:14+00:00 London Software Engineering Full time At JP Morgan Chase, we understand that customers seek exceptional value and a seamless experience from a trusted financial institution. That's why we launched Chase UK to transform digital banking with intuitive and enjoyable customer journeys. With a strong foundation of trust established by millions of customers in the US,...

At Kpler, we are dedicated to helping our clients navigate complex markets with ease. By simplifying global trade information and providing valuable insights, we empower organisations to make informed decisions in commodities, energy, and maritime sectors.   Since our founding in 2014, we have focused on delivering top-tier intelligence through user-friendly platforms. Our team of over 850 experts from 69 countries works tirelessly to transform intricate data into actionable strategies, ensuring our clients stay ahead in a dynamic market landscape. Join us to leverage cutting-edge innovation for impactful results and experience unparalleled support on your journey to success.   You will join a data-intensive product team responsible for building and operating core data pipelines and backend systems that model and deliver insights on global refinery operations and economics. The team works at the intersection of data engineering, backend engineering, and data science, transforming diverse industrial and market data into reliable, production-grade datasets used by customers and internal teams.   This role is a senior individual contributor position, with significant ownership over data architecture, pipeline reliability, and engineering standards. You will help shape how data is engineered, validated, and delivered across the Refineries product.

We're all about helping brands turn ideas into impact. Frontify’s brand platform transforms how teams organize digital assets, collaborate on projects, and create engaging campaigns. Our people empower thousands of marketers and designers — including teams at Uber, Microsoft, Volkswagen, and Telefónica — to build engaging brands. With headquarters in St. Gallen, Switzerland, and offices in London and New York City, we share a vibrant culture built on creativity, collaboration, inclusion, and joy. And we’re on the lookout for new team members to share our vision. If you’re ready for a brand-new adventure, keep reading! Your team Your new team is a group of motivated, collaborative, and innovative Engineers. Working on-site, hybrid, or fully remote, they come together to create and evolve a well-loved product but always keep room for new ideas and approaches. Outside of work, they’re parents, gamers, bookworms, adrenaline junkies, and so much more. Your mission As a Senior Backend Engineer working in the Developer Experience team, you’ll take on a challenging role in collaborating with product managers, stakeholders, and fellow engineers to build and optimize a dynamic, scalable, and high-impact platform.   Our team takes pride in creating seamless user experiences while ensuring the underlying systems are efficient, robust, and extendable. You'll contribute to architectural decisions, and drive technical excellence across the stack with emphasis on the Backend at scale.   You'll contribute to the evolution of our platform, ensuring efficient data structures, clear API interfaces, building and evolving developer tools and framework, supporting platform extensibility and scale third-party integrations.   Your work will encompass API design and implementation, ensuring high-quality code with well-defined testing strategies and having a scalability mindset. Your expertise in API design, scalability and understanding of public facing interfaces will be instrumental in enhancing our platform’s reliability and extensibility.

Application deadline: We are conducting interviews actively and aim to fill this role as soon as we find someone suitable.    THE OPPORTUNITY   Join our new AGI safety product team and help transform complex AI research into practical tools that reduce risks from AI. As a Backend Engineer, you'll work closely with our CEO (also Head of Product), product engineers and Evals team software engineers to build products that make AI agent safety accessible at scale. We are building products that monitor AI coding agents for safety and security failures.   You will join a small team and will have significant ability to shape the team & tech, and have the ability to earn responsibility quickly. You will like this opportunity if you care about building products that genuinely make AI agents safe and thrive in high-paced environments as well as enjoy closely working with researchers.     KEY RESPONSIBILITIES   Infrastructure & Architecture - Design and implement scalable backend systems capable of processing and analyzing large volumes of AI agent logs in real-time - Build and maintain data processing pipelines that extract, transform, and store agent trajectory data efficiently - Architect database schemas and data models optimized for both high-throughput writes and complex analytical queries - Design for reliability, implementing robust error handling, retry logic, and graceful degradation strategies - Monitor system performance and optimize bottlenecks to ensure sub-second latency for critical monitoring operations   API Development - Develop secure, well-documented RESTful APIs that allow customers to integrate our monitoring product into their workflows - Implement authentication, authorization, and rate limiting to protect customer data and ensure fair resource usage - Build webhook systems and real-time notification services to alert customers about critical safety events - Design API interfaces that are intuitive for developers while remaining flexible for diverse customer use cases - Design and implement integrations with Security Information and Event Management (SIEM) systems, enabling customers to stream monitoring alerts and security events into their existing security operations workflows   Data Systems - Implement efficient storage solutions for both structured data (monitoring results, metadata) and unstructured data (agent logs, code outputs) - Build data processing systems that can handle everything from streaming real-time monitoring to batch analysis of historical data - Design and implement caching strategies to optimize frequent queries and reduce infrastructure costs - Create data retention and archival policies that balance customer needs with storage efficiency   Monitoring & Observability - Build comprehensive logging, metrics, and tracing systems to ensure visibility into system health and performance - Implement alerting systems that notify the team of infrastructure issues before they impact customers - Create dashboards and tools that help the team understand system behavior and diagnose issues quickly - Design systems that make debugging production issues straightforward and minimize time-to-resolution   Collaboration & Quality - Work closely with our researchers to understand their needs and translate research prototypes into production-ready systems - Collaborate with frontend engineers to design APIs and data structures that enable excellent user experiences - Participate in code reviews to maintain high standards for code quality, security, and performance - Document architectural decisions, API specifications, and system behaviors to facilitate knowledge sharing - Contribute to technical discussions about technology choices, trade-offs, and implementation approaches

Aircall is a unicorn, AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, resolve issues faster, and scale customer-facing teams. We’re redefining customer communications by bringing voice, SMS, WhatsApp, and AI together into one seamless workspace. Our momentum comes from a simple idea: help teams work smarter, not harder. Aircall’s AI Voice Agent automates routine calls, AI Assist streamlines post-call work, and AI Assist Pro delivers real-time guidance so people can do their best work. The result is higher revenue, faster resolutions, and teams that scale with confidence. Aircall is headquartered in Paris, our European HQ, with a strong North American presence anchored in Seattle, our North American HQ, and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We’ve built a product customers love and a business that’s scaling quickly, backed by world-class investors and driven by rapid AI innovation across multiple product lines. At Aircall, you’ll join a company in motion. We’re ambitious, product-driven, and execution-focused, with visible impact, fast decisions, and real growth. How we work at Aircall: We’re customer-obsessed, data-driven, and focused on delivering meaningful outcomes. We value ownership, continuous learning, and thoughtful speed. If you thrive in a collaborative, fast-moving environment where trust and impact matter, you’ll feel at home here. About the role : As a Senior Backend Software Engineer, you will be responsible for the design, development, deployment, and operation of business-critical features that add customer value on top of voice. Best practices, evangelization, and mentoring in your team and across the whole of Engineering will be part of your day to day job.   Quality, excellence, and agility drive our delivery processes and you will help us level these up.   Using a variety of back-end stacks, appropriate for each requirement, but always hosted on AWS, we build added value and resilient services on top of voice and fully integrate with our customers’ business critical tools (CRM, Helpdesk, E-Commerce, ...).

Job title: Senior Backend Engineer with Content delivery experience Location: Remote Duration: 06 months contract About the Position We're looking for a Senior Engineer with experience in automated CDN configuration management and/or a background in Content Delivery to join our CDN team. In this role, you will contribute to the development and optimization of the foundational infrastructure that powers our Media Delivery and play capabilities. O...

Senior Backend Engineer The Senior Software Engineer will join a high-performing backend engineering team responsible for building and scaling modern, cloud-native platforms that power customer-centric financial products. You’ll play a key role in designing and delivering resilient, secure, and high-performance systems, working within collaborative squads focused on solving real-world problems at scale. This role sits within an innovative, fast-...

Backend Engineer (Python / FastAPI) Fast-Growing Sports AI Company KEY POINTS Hybrid role based in London Build real time, data rich applications for the sports industry Small, fast-moving team with high ownership and real impact Work at the forefront of AI and LLMs applied to sport Stack flexible, as long as you are happy in Python, FastAPI and modern web tooling Salary up to 100,000 depending on experience Ideally a genuine sports fan ABOUT TH...

Senior Lead Software Engineer- Backend Engineer - Chase UK 210591504 T10:26:14+00:00 London Software Engineering Full time At JP Morgan Chase, we understand that customers seek exceptional value and a seamless experience from a trusted financial institution. That's why we launched Chase UK to transform digital banking with intuitive and enjoyable customer journeys. With a strong foundation of trust established by millions of customers in the US,...

Software Engineer III - Backend Engineering - Java/Kotlin 210588623 T15:57:16+00:00 London Software Engineering Full time Out of the successful launch of Chase in 2021, we're a new team, with a new mission. We're creating products that solve real world problems and put customers at the center - all in an environment that nurtures skills and helps you realize your potential. Our team is key to our success. We're people-first. We value collaborati...