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Client Server Limited

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292 jobs

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292 jobs Posted Sort

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

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.

Senior Full Stack Engineer - Start-up

Open 15d On-siteUKSenior

Overview As one of the UK’s first engineers, you will own the architecture and drive end-to-end product delivery in a fast-growing sports tech start-up. You’ll build consumer-facing features from ground up, shaping…

AI API React Rust TypeScript

Senior Python Developer / Consultant SaaS

Open 15d HybridUKSenior

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 17d 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

Client Server Limited

Python Developer

A Python backend developer joins an R&D team building a new greenfield product that uses AI to defend against AI-based cyberattacks. Day-to-day involves building complex Python backend systems, rapid prototyping, and working with Rust, TypeScript/C++ and cloud platforms (AWS/Azure/GCP) in a hybrid role based in Cambridge.

AI AWS Azure Cloud C++ +6 skills

Client Server Limited

Front Office C++ Backend Engineer — Low-Latency Trading

Open 18d RemoteUK

Backend C++ engineer redeveloping a core equity trading system for the EMEA market, tackling high-volume data and low-latency challenges on Linux. Front-office role with direct trader exposure and design-to-delivery ownership, paying up to £125k plus bonus, based in London with a weekly work-from-home option.

Client Server Limited

Senior Backend Engineer: Python, ML & AWS (Remote UK)

Open 18d RemoteUKSenior

Senior Backend Engineer building Python backend services to help produce and deploy machine learning models into production on AWS, working day to day with data scientists and ML engineers across the full ML lifecycle. Fully remote within England/UK, up to £90k, with flexible hours and mentoring opportunities.

AWS Machine Learning Python

Client Server Limited

Hybrid Lead Java Engineer & Team Architect

Open 18d UKLead

Lead a small development team in Manchester building real-time sports betting applications, blending hands-on Java architecture and coding with mentoring, coaching, and full delivery lifecycle ownership alongside the Product Owner.

Full Stack Engineer / Technical Lead B2B SaaS

Open 19d UKLead

Senior hands-on lead role owning the technical strategy and architecture for a real-time infrastructure company's developer ecosystem: designing APIs and SDKs, expanding client libraries, guiding open-source collaboration and mentoring engineers. Core stack is Ruby, TypeScript and React, with openness to AI tooling like Claude and Cursor.

AI API Automation Design Patterns iOS +5 skills