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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.

The role involves the design and development of backend services and infrastructure for Machine Learning workloads.

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

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

Software Architect Java - BackEnd, Back End Google Cloud (GCP)Contract: Until December 2026 - RenewableLocation: Essex Offices (located between Brentwood and Basildon) 4 days a weekRate: £600 per Day Inside IR35The finance and banking division of this engineering company and household name is se

Lead Java Backend EngineerHybrid - 2 days per week in Newcastle/LondonThis is an opportunity for a Lead Java Backend Engineer to shape the backend technical direction, bring teams together, and introduce modern engineering practices that support scalable, secure, and high-performing systems.

Senior backend skills with at least 5 years of experience with Java, and a good understanding of Python (FastAPI, Flask…), SQL based databases. Senior Software Developer with a Backend Focus. To professionalise our product development and continue our growth path, we are currently looking for a se

Design and evolve scalable backend systems and databases, ensuring performance, security, and resilience. You’ll build SDKs, CLIs, APIs, and backend systems that make it easy for engineers to integrate growth features and infrastructure safely, consistently, and at scale.

We own a suite of backend and frontend systems that automatically scan HubSpot’s codebase and infrastructure to catalog PII usage and ownership, classify datasets, enforce data protection standards, and orchestrate GDPR deletion workflows when customers exercise their rights. Are senior backend en

A fast-growing tech company in the UK is seeking product-focused systems engineers to join their Integration team.You will work on comprehensive projects that include building integrations with Kubernetes, Terraform, and more.Ideal candidates have experience in Go or Rust, along with Linux systems e

A fast-growing cybersecurity startup is seeking a Senior Python Engineer to design and develop scalable backend systems using Python and AWS serverless technologies.

As a Backend Engineer, you'll be working on mission-critical, data-intensive applications that push the boundaries of technology, taking ownership of the full software engineering lifecycle, including design, development, and implementation. Reporting into an Engineering Manager, the Backend Enginee

We're looking for an experienced data-focused backend developer to help supercharge our product, integrations and APIs.

A growing technology company in the UK is seeking a Mid-Level Software Engineer to enhance their data processing infrastructure.You'll contribute to developing core applications, focusing on building robust pipelines using TypeScript and Node.The ideal candidate should have over three years of exper

As a backend developer, you will be responsible for developing the middle- to back-end logic and algorithms of our web app.

Designing and implementing testing strategy for the Backend API Platform. We are looking for an experienced and responsible Senior QA Automation Engineer with a strong technical background in backend and API testing. You will be a key member of our QA team, maximizing product quality by focusing pri

A global technology company is seeking a Senior Software Engineer II to design and build backend systems for messaging platforms like Email, SMS, and WhatsApp. This remote role in the UK demands deep backend engineering experience, with responsibilities including leading complex projects, ensuring s

The Pro team is responsible for everything to do with the trading backend services such as the matching engine, market data gateways, internal and external APIs, and various other trading services.

A staffing and recruiting firm is looking for a mid-level backend developer to join their Ads Organization.

The successful candidate will design and operate backend services, develop systems for managing context, and ensure high performance and reliability.

Own the full backend lifecycle — Design, develop, test, monitor and maintain backend services for our casino platform. In this role, you'll build and maintain the backend systems that power our casino experience, develop APIs that support our mobile and web applications, and deliver robust, mainta

Backend Developer (Kotlin/Java, Android APIs).

Clarify is building the world’s first autonomous CRM.For decades, CRMs have offloaded work onto teams.Our customers are founders and sellers who want a CRM that feels modern, intelligent, and helpful—one that pushes deals forward instead of slowing them down.We’re a lean, ambitious team backed

The ideal candidate will have over 3 years of software engineering experience and proficiency in backend coding languages such as Rust or Node/Typescript.

A cybersecurity and technology firm is seeking a skilled Back End Software Engineer with strong experience in Microsoft Azure technologies.The role involves designing and maintaining Azure SaaS applications and collaborating with teams to deliver innovative solutions.Candidates should have 5+ years

This Software Engineer III (Backend) role is a senior-level IC with significant ownership over the web application that customers use to interact with our product. Lead the design, development, testing, and deployment of scalable, high-quality backend services in Go. Drive the technical evolution of

A leading software development company in the United Kingdom is seeking a Senior Software Engineer to innovate and develop next-gen software solutions.The role involves designing, optimizing, and troubleshooting platform components, requiring at least 4 years of relevant software development experie

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

Architect and implement robust backend systems in Golang, including RESTful and WebSocket APIs to support game logic, player stats, token transactions, and rewards logic. Ensure platform security across smart contracts, APIs, and backend services. Stay current with evolving Web3, gaming, and backend

The ideal candidate will have over 8 years of professional software engineering experience, particularly with backend services in Go and gRPC.

A leading gaming studio in the United Kingdom is seeking a Platform Backend Engineer. The ideal candidate has 3+ years of backend development experience, familiarity with NoSQL databases, and is proactive in problem-solving.

The Story So Far: We’re Building a Global Brand in Real Estate.Huspy is one of the leading property technology companies in EMEA.Launched in 2020, we now operate in multiple cities across the UAE and Spain, expanding into Saudi Arabia and 3 more European markets by 2026.Today, we own the largest p

As Backend Lead Engineer at Deltatre, you lead a cross-functional engineering team responsible for the architecture, design, and delivery of backend services powering cloud-based media platforms. Deltatre’s backend team comprises of the most talented. As one of our Backend Engineers, you will be w

A leading recruitment firm is seeking a Contract Senior Full Stack Software Engineer to work remotely in the UK.The role focuses on delivering customer engagement features for a high-impact mobile application.Candidates should have strong skills in React.React Native, along with cloud experience.The

A technology investment firm in the United Kingdom is seeking an experienced Backend Engineer to drive product innovation in their Linea AI team. Ideal candidates have 6+ years of backend experience, proficiency in Python or Go, and a background in deploying AI solutions.

This role involves designing and building backend services and public APIs for customer-facing capabilities. The ideal candidate will have over 5 years of backend experience and proficiency with Go, as well as a track record of implementing public APIs.

The role involves owning the backend lifecycle, building APIs, and writing maintainable code. Candidates should have over 5 years of backend experience, strong Python skills, and a solid understanding of databases. A next-gen sports betting platform is seeking a Senior Backend Engineer to join their

A leading tech company is seeking a Senior Backend Engineer to empower SMBs with world-class technology. Ideal candidates will have experience with backend technologies and a strong understanding of user needs.

This backend-focused role involves building integrations and developing RESTful APIs using Python and Django.

We are looking for an awesome Senior Java Backend Developer to join our growing team.

Staff Software Engineer to join our Customer Knowledge team in the UK or Ireland.This is a unique opportunity to architect and build large-scale, globally distributed applications that process hundreds of thousands of data points per second.In this role, you will be at the forefront of innovation, w

A healthcare technology company in the United Kingdom is seeking a Senior Backend Engineer to join their application modernization team.

The role offers the opportunity to design scalable backend systems in a remote-first or hybrid environment.

A dynamic tech company in the UK seeks a Mid-Senior Backend WordPress Developer for a fully remote role.

A leading software testing company in the United Kingdom is seeking a Lead Backend Software Engineer to own the technical delivery of product features. This role combines hands-on backend development with end-to-end delivery leadership, requiring strong skills in JVM-based technologies and distribut

Observability, and Scale from Day One.Fluency with flexible databases like MongoDB and solid understanding of API architecture.REO:Digital is a leading customer experience agency in central London, specializing in digital experiences for global brands like Amazon, M&S, Tesco, and Samsung.We apply de

The ideal candidate will have over 5 years of experience in building high-performance backend services, preferably using Kotlin.