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Client Server

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309 jobs

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309 jobs Posted Sort

Client Server Limited

Senior Java Backend Engineer — AI-Assisted RealTime Trading

Senior Java backend engineer modernising a high-performance real-time trading system onsite in Newcastle upon Tyne. Day to day: hands-on backend Java development, architectural input on latency-sensitive design, and collaboration with Front Office and engineering teams, using AI tools like Claude to speed up delivery.

Client Server Limited

Senior C#/.NET API Engineer — Full-Stack, Remote/WFH

Senior C#/.NET engineer owning features end-to-end — API design, backend services, and Vue.js front-end delivery — on a global payments platform in the Corporate Payments division. Mostly work-from-home with occasional office days in Bracknell; AWS production experience is a plus.

API Api Design AWS C# SQL +1 skills

Senior Systems Engineer SRE Golang - FinTech

Senior Systems Engineer (SRE Golang) to £130k Are you an experienced Systems Engineer with a strong knowledge of modern software infrastructure and robust APIs? You could be progressing your career in a hands-on Senior…

API Fintech Go SRE

Client Server Limited

Java Developer AI Claude - FinTech

Senior hands-on Java backend developer at a scaling FinTech in Central Newcastle, modernising a C++ trading system into a scalable, low-latency Java application while using AI tools like Claude. Full-time onsite Monday to Friday, collaborating closely with Front Office trading teams.

AI C++ Fintech Java

100K – 120K £

Client Server Limited

Senior React Frontend Lead - Remote-Friendly with Equity

Senior/lead React developer to own the frontend of Client Server's core product — a financial operating system for live events — leading frontend architecture, improving performance and usability, collaborating with product/design, and mentoring juniors. Hybrid role based in London (3-4 office days/week) with equity on offer.

Client Server Limited

React Developer Senior / Lead

Senior/Lead React Developer owning the front end of a scale-up's core product — a financial operating system for live events — leading architecture, staying hands-on with React, integrating payment flows and real-time data, and mentoring junior developers. London-based with WFH flexibility after the first six months.

Client Server Limited

Python Developer / Team Lead - FinTech

A hands-on Python Developer / Team Lead at a profitable FinTech start-up, leading a small team building features for a core banking platform that integrates with major banks like HSBC. Roughly a 50/50 split between architecture/design and people management, using Python, FastAPI and GCP in a hybrid London role.

API AWS Azure CI/CD Cloud +7 skills

100K – 120K £

Client Server Limited

Lead Python Developer & Team Lead — Hybrid (London)

Lead a small London tech team as a hands-on Python Developer & Team Lead, splitting time 50/50 between architecture/design and people management while delivering features and refactoring a core banking platform. Core stack: Python, APIs, cloud services, CI/CD; hybrid model with office days in London and up to two remote days per week.

API CI/CD Cloud Python

Head of IT Operations Azure

Lead IT operations for a growing technology-led bank in Solihull (hybrid/remote options), owning service delivery, service transition, operational governance and change management across an Azure-based estate, acting as the operational SME to keep technology services running safely in a regulated environment.

Software Engineer Python AI - Renewable Energy

Software engineer role building Python-based AI solutions for business systems at a rapidly scaling UK renewable energy company with a growing portfolio of wind and solar assets, taking solutions from build into production. London-based with WFH flexibility, paying up to £120k.

Senior Java Developer Spring Boot TDD

A Senior Java Developer / Backend Engineer at a global games software house, guiding a small, high-performing team building real-time sports betting applications. The role blends hands-on Java, Spring Boot and TDD development with team leadership, based in Manchester with WFH options, up to £78k.

Java Spring TDD

C# Software Engineer .Net WPF - Trading

Senior hands-on C# Software Engineer building sophisticated front-office trading UIs with .NET WPF at the investment management arm of a global bank in Central London, supporting real-time, high-performance equities and options trading.

Systems Engineer SRE Golang - FinTech

Hands-on Systems Engineer (SRE) role at a scaling FinTech building a cross-border payments platform for low-cost, near-instant money transfers. Day to day involves Golang-based infrastructure and robust API work; London-based with WFH options, salary up to £100k.

API Fintech Go SRE

Senior Python Developer / Consultant SaaS

Hands-on senior Python consultant building cloud-based SaaS for law firms at a profitable scale-up, leading bespoke client projects end-to-end from design to deployment on AWS using Python, FastAPI and CDK. Hybrid role based in Manchester (3 days on-site), salary up to £80k.

AWS CDK Cloud DevOps FastAPI +2 skills

Senior QA Test Engineer

Open 15d UKSenior

Senior QA Test Engineer (Manual / Automation Playwright Web Mobile) Bracknell to £70k Opportunity for a skilled QA Test Engineer to join a major rebuild of a leading international payments platform, working within the…

Automation Playwright Test Automation

Account Executive ITSM

Account Executive London / WFH to £80k base (£150k OTE) Are you a bright, ambitious Account Executive with an interest in technology / cybersecurity? You could be progressing your career at a rapidly scaling technology…

Account Executive Cybersecurity

Python Software Engineer Conversational AI

A remote (UK-based) senior, hands-on Python engineer role at a scaling AI software solutions provider. The person builds production-grade conversational AI systems and their supporting infrastructure using a backend-focused Python stack, earning up to £90,000.

AI Conversational AI Python

Client Server Limited

Full-Stack Developer, Sports Tech & End-to-End AI

HireHi, a sports technology company at the intersection of sports, data, digital insights and betting, seeks a lead software engineer in Greater London. You will shape architecture, build products from scratch, and own…

Senior Java Developer Spring Boot TDD

Open 16d UKSenior

A senior hands-on lead building real-time sports betting backend services with Java and Spring Boot, guiding a small team (~80/20 coding vs leadership), championing TDD and CS fundamentals, and driving delivery with Product Owners.

Agentic AI AI Design Patterns Java Multithreading +4 skills

Client Server Limited

full stack developer for sports technology

Full-stack developer at a London-based sports technology company working across US sports (NFL, NBA, baseball, hockey) and betting. You'll shape architecture, build products from the ground up with TypeScript and React, own features end to end through production, and advise the team on using AI in development.

AI API React Rust TypeScript