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Client Server

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88 jobs

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88 jobs Posted Sort

Senior Software Engineer Python - Energy Trading

Senior Python engineer at a fast-growing energy-tech firm in London: own the Python production codebase for power price forecasting, asset optimisation, dispatch and trading — turning quantitative research into clean, production-grade software while raising standards in testing, observability and performance.

Analytics CI/CD Observability Python

Client Server Limited

Senior Full Stack Engineer Vue C# .Net

New RemoteUKSenior

Senior full-stack engineer at a global financial services company rebuilding its international payments platform: owns features end-to-end with roughly 70% Vue.js frontend and 30% C#/.NET backend/API work, using AWS, microservices and SQL. Mostly work-from-home with two days a week in the Bracknell office.

API AWS Cloud C# .NET +7 skills

Client Server Limited

Hybrid Senior Full-Stack Engineer (Vue + C#/.NET)

New HybridUKSenior

Senior full-stack engineer in Bracknell (hybrid: mostly remote, twice-weekly in office) owning features end-to-end across a Vue.js frontend and C#/.NET backend, driving architecture decisions and working with Product, Design, and Compliance. A regulated payments background and STEM degree are pluses.

Client Server Limited

Senior C#/.NET Backend Engineer – SQL, London Onsite

UKFull-timeSenior

Senior backend C#/.NET engineer at Client Server Limited, building backend services full-time onsite in the company's London City office. Day-to-day work centers on C#/.NET services with strong SQL/Oracle database work, solid CS fundamentals, and stakeholder communication.

C# .NET Oracle SQL

Senior Full Stack Engineer Vue C# .Net

A senior, hands-on full-stack engineer role at a global financial services company, helping rebuild its international corporate payments platform using Vue on the front end and C#/.NET on the back end. Based in Bracknell with a WFH option, salary up to £85,000.

Senior DevOps Engineer

Senior hands-on DevOps engineer joining a global financial services company to help rebuild its international payments platform within the Corporate Payments division. Day-to-day work centers on building scalable, resilient delivery platforms using AWS, VMware and GitHub, based in Bracknell with WFH flexibility, salary up to £95k.

AWS DevOps GitHub VMware

Senior Java Developer Spring Boot TDD

Senior Java Developer / Backend Engineer at a global games software house in Manchester (WFH options), paying up to £78k. Day to day you guide and inspire a small, high-performing team building real-time sports betting applications using Java, Spring Boot and TDD.

Java Spring TDD

Senior DevOps Engineer

Hands-on Senior DevOps Engineer building, deploying and operating production systems for a global financial services company rebuilding its international payments platform (Corporate Payments division). Core stack includes AWS, VMware and GitHub; based in Bracknell/Warfield with WFH flexibility, salary up to £95k.

AWS DevOps GitHub VMware

Senior Front End Engineer React - PoS

Senior front-end engineer owning the React front end of a point-of-sale product described as a financial operating system for live events, cutting customer queue times and maximising vendor revenue. Role is based in Central London with some WFH, salary up to £90,000.

Client Server Limited

Senior Full-Stack Engineer – Remote UK, AI‑Driven Fintech

Staff-level full-stack engineer owning the architecture of a real-time energy trading platform, staying hands-on building scalable systems with TypeScript, Node.js, React and AWS, collaborating across teams and influencing product decisions while using AI-assisted development practices. UK-based role.

AI AWS Node.js React TypeScript

Client Server Limited

Senior Python Backend Engineer - AI Security (Hybrid UK)

Senior Python backend engineer joining an R&D team in London to build a greenfield project in AI security, working hybrid with two office days per week. The role is primarily Python backend, with occasional work in Rust, TypeScript, or C++.

C++ Python Rust TypeScript

Client Server Limited

Senior Java Backend Engineer — AI Claude, Real-Time FinTech

Senior Java backend engineer, onsite in Newcastle upon Tyne, to modernise a trading system for a scaling FinTech: designing robust, high-performance, low-latency Java solutions with Front Office teams, using AI tools like Claude. Salary up to £120k.

AI Fintech Java

Client Server Limited

Senior C# .NET Backend Engineer – Fintech (Newcastle)

A senior backend engineer role designing and building C#/.NET services for fintech platforms, with a focus on high-performance, reliable distributed systems. The engineer owns technical initiatives, influences system design, and works across the full lifecycle from architecture to production delivery, based in Newcastle.

C# Distributed Systems .NET Fintech

Client Server Limited

Senior Python Developer (AWS) – Hybrid, Growth Path

Senior backend developer/consultant building bespoke AWS SaaS solutions for clients in Manchester (hybrid with WFH options). Day to day is hands-on Python/FastAPI development plus cloud infrastructure work with AWS CDK and DevOps practices to deliver end-to-end cloud solutions and influence product direction.

AWS CDK Cloud DevOps FastAPI +2 skills

Client Server Limited

Senior Python Backend Engineer - AI Cybersecurity

Build a greenfield AI-driven cybersecurity product at Client Server Limited: as Senior Python Backend Engineer you will rapidly prototype ideas, tackle complex problems, and deliver robust backend services using Python and cloud platforms, ideally with some Rust, TypeScript, or C++ exposure.

AI Cloud C++ Cybersecurity Prototyping +3 skills

Client Server Limited

Senior C# Backend Engineer – Real-Time Trading Systems

UKFull-timeSenior

Senior backend engineer joining a London-based trading engine team to design and build real-time trading systems and own Greenfield projects alongside the strategy team. Core stack is C#/.NET with ASP.NET and SQL/Oracle, plus some JavaScript/React; full-time onsite in the City office.

C# .NET JavaScript Oracle React +1 skills

Client Server Limited

Senior Python Developer - Cyber Security

Senior Python Developer joining the R&D team of a cybersecurity technology business in London (hybrid, twice a week in office) to build a new Greenfield product combating AI-based attacks — mostly backend Python work plus Rust and other emerging technologies. Salary £75k–£85k plus bonus and benefits.

AI AWS Azure C++ Cybersecurity +5 skills

Senior Python Developer - Cyber Security

Senior Python developer role at a cybersecurity technology company that uses AI to protect clients globally. Day-to-day involves backend engineering on complex systems, based in London or working from home, with a salary of up to £85,000.

AI Cybersecurity Python

Senior Python Developer - Cyber Security

A Senior Python Developer / Backend Software Engineer builds backend systems at a cybersecurity company in London that uses AI to defend clients worldwide from advanced cyber threats. Day to day: Python backend development on complex systems, with hybrid/WFH options and a salary up to £85,000.

AI Cybersecurity Python

Client Server Limited

Senior C# .NET Full-Stack Engineer – Remote

Senior full-stack engineer owning features end-to-end (API, backend, frontend) with C# .NET and Vue.js for an international payments platform, including architecture ownership and collaboration with Product, Design and Compliance. Mostly work-from-home with twice-weekly presence in the Bracknell office (hybrid).

API C# .NET Vue