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Senior Backend Engineer – High-Scale Systems | Python & FastAPI | Security SaaS. Senior Backend Engineer – High-Scale Systems | Python & FastAPI | Security SaaS. They've completed Series A funding, raising $29 million across three funding rounds, and are now seeking a Senior Backend Engineer.

Our backend tech stack is Spring Boot with Java/Kotlin/Groovy, MySQL and Opensearch, hosted on AWS. Our frontend is React with Typescript, and you will be expected to contribute small features to the frontend (though the role is at least 95% backend). You're an experienced engineer with multiple ye

Backend Product Engineer (London) -. We’re looking for a Backend Product Engineer to help scale high-growth systems and support the next phase of product expansion. This role focuses on building reliable, secure, and high-performing backend services that power new features and capabilities.

As a Senior Engineer you will play a critical role in the development and maintenance of the backend aspects of the pricing system for our sportsbook and work alongside our quantitative analysts to deliver our in-house pricing solution. This position will be able to come in and have a lot of ownersh

Compensation: Competitive, based on location and experience .Location: UK or Turkey (Hybrid – Office & Remote).Keepnet is an AI-driven SaaS platform experiencing strong, sustained growth in the UK with growing global momentum, helping organisations manage human cyber risk at scale.Keepnet runs

Backend Developer Romsey, Hampshire (Hybrid - 3 days office / 2 remote, flexible)£45,000 - £50,000 + BenefitsOOP, PHP, LaravelMy client build innovative SaaS solutions that help organisations monitor, manage, and optimise critical infrastructure.

Software Architect Java - BackEnd, Back End Google Cloud (GCP).

An innovative firm is seeking a skilled developer to create containerized web applications.This remote opportunity allows you to leverage your expertise in Python and modern frameworks like FastAPI and Django.You'll be responsible for designing scalable applications, collaborating with cross-functio

Strong proficiency in backend programming languages like Java, Python or Go.

The ideal candidate will have experience in backend service development, familiarity with machine learning frameworks like PyTorch, and containerization skills using Docker and Kubernetes.

A leading aviation company in Greater London seeks a Software Engineer to design, develop, and optimize backend and frontend systems.

We are looking for an exceptional Software Engineer, to join our Backend Engineering squad.

A leading technology firm is seeking a Software Engineer to enhance backend and frontend services related to Client Services.

The role involves leading backend development using advanced Python skills and collaborating with product and design teams.

A leading fintech company is looking for a Senior Backend Developer to own the infrastructure for data pipelines, APIs, and databases. The role requires 5+ years of backend experience, particularly in TypeScript, and familiarity with real-time systems such as WebSockets.

A prominent tech company is seeking skilled engineers in Greater London to join their Core Tooling team.The role involves contributing to tooling for efficient development, focusing on Go, Kubernetes, and AWS.Candidates should demonstrate strong software-related security experience and a collaborati

Tackle hard backend problems - latency, reliability, and scale are everyday concerns. Deep expertise in Python and building backend systems on cloud platforms (we use AWS). We're a startup in the automated decisioning space - and the backend is where the hard problems live.

A leading tech company is seeking a MongoDB Developer to lead database delivery, including schema design and performance tuning.The ideal candidate will have 6-10 years of experience in software development focused on MongoDB, strong analytical skills, and a collaborative approach.Responsibilities i

A leading game development firm in the United Kingdom is seeking a Principal Backend Engineer to lead the delivery and deployment of backend services for game projects.

This hybrid role requires expertise in Java and microservices architecture, with responsibilities including developing new features and maintaining backend services.

Senior Software Engineer I - Backend (Java) - Business Accounting Integrations and Reporting. Strong proficiency in backend programming languages like Java, Python or Go.

A leading sportswear company is seeking a Backend Software Engineer to develop and maintain cloud-native applications using TypeScript and microservice architectures. Candidates should have at least 3 years of backend experience and a strong collaborative mindset.

A leading global investment firm is seeking a Senior Java Developer to design and develop scalable applications that support trading operations.This role involves collaboration with multi-functional teams, optimizing high-performance APIs, and mentoring junior engineers.The ideal candidate will have

You will act as a trusted backend partner for Product and Platform teams, stabilising third‑party integrations, improving background job efficiency, and utilising architectural documentation like C4 models to ensure long‑term scalability. You will have the autonomy to own multiple backend system

As a Senior Backend Software Engineer in the Core Team, you’ll play a critical role in engineering the backbone of our payment platform.

A leading AI company in Greater London is seeking a Senior Software Engineer to lead backend and edge/IoT engineering for high-impact projects.

A cutting-edge AI company in Greater London seeks a Lead Software Engineer to spearhead backend and edge/IoT engineering for Defence projects.

A financial technology company in Greater London seeks a generalist developer to contribute to various projects.The role involves building and maintaining client libraries for APIs across multiple languages like PHP and Ruby, working on identity-checking systems, and developing internal services for

A tech consultancy is seeking a hands-on Python Developer for a contract role in Dacorum.You will be involved in building and maintaining Python-based back-end services, developing web applications with frameworks like Flask or Django, and supporting legacy system modernization.A proactive problem s

A leading vacation rentals company in Greater Manchester seeks a passionate Software Engineer for its Payments Team.You will design and build services for transaction processing and contribute to the architecture of payment solutions.The ideal candidate will have experience in AWS services, API deve

We’re on a mission to make money work for everyone.We’re waving goodbye to the complicated and confusing ways of traditional banking.With our hot coral cards and get-paid-early feature, combined with financial education on social media and our award winning customer service, we have a long histo

In this role, you will lead the development of core backend systems and build web applications and APIs while also supporting frontend tasks using frameworks like Vue.

A recruitment agency is seeking a Senior Technical Lead to guide the delivery of scalable backend systems. This position balances leadership, architecture, and hands-on coding, with a focus on delivering impactful backend solutions.

A fintech startup in London seeks a Backend Developer to create AI-powered product capabilities and scalable backend architecture. Ideal candidates will have 3–4 years of experience in backend development, particularly with Java and Spring Boot.

Backend : Typescript,EVM and integration patterns. They are looking for a Senior Backend Developer who will own the infrastructure powering data pipelines, APIs, real-time delivery, and the databases underneath. Own architecture decisions for the company's backend systems.

A cutting-edge technology firm is seeking a hands-on leader for backend and data engineering in London.

A leading financial technology company based in the UK is seeking a backend engineer to join its newly-formed Acquiring Platform team. Ideal candidates will have strong backend programming skills, a knack for designing APIs, and the ability to work collaboratively in a dynamic environment.

Create robust APIs and data service: Design and optimise APIs and backend services that power Vega’s frontend applications and enable complex data workflows across the platform. Build AI‑powered product capabilities: Design and develop backend systems powering Vega’s AI‑enabled platform, inc

A high-growth B2B SaaS company in the United Kingdom seeks a Software Development Manager to lead a team of about 8 engineers.In this non-coding but highly technical position, you will drive engineering best practices, improve team performance, and support critical technical decisions.The ideal cand

In this role, you will design and build high-performance backend services, leveraging your skills in Rust and PostgreSQL to contribute to critical financial infrastructure.

We are looking for a generalist developer to join our team to help build out systems & handle user growth.You’ll have the opportunity to contribute to different areas of the code-base and choose which projects interest you.Our service is built on Ruby on Rails, but particular experience is not a p

Has 5+ years of professional backend experience with strong computer science fundamentals in data structures, algorithms, and software design patterns.

The successful candidate will own backend system architecture and ensure scalable and secure design.

You will have a leading role in designing, developing and maintaining the backend system that powers our cybersecurity platform – the platform we use to identify vulnerabilities in large enterprises.

As a Senior Software Engineer, Backend at Fanalysis, you'll be responsible for building and maintaining the robust backend services that power our football fan platform. Solid grounding in backend software development. Designing, building, and maintaining high-performance backend services and APIs t

You will guide backend architecture, ensuring high standards in performance, security, and reliability.

We need senior backend engineers who can take ownership of complex problem spaces, ship production‑grade services, and help us build the engineering foundation for the next generation of onchain payments. This is a Senior Backend Engineer position on the WalletConnect Pay team. The common thread i

A leading tech company in Greater London seeks a Lead Software Development Engineer in Test (SDET) to oversee a small team, drive automation strategies, and enhance testing processes.Candidates must have a minimum of 8 years of experience in test development, strong Java proficiency, and a backgroun