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Client Server Limited

Jobs Hiring Closed Discussion

76 jobs

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76 jobs Posted Sort

Backend Software Engineer Python R&D

Join an R&D team building a greenfield backend product that counters AI-based security threats. The role is primarily Python (with Rust/exposure to other languages), spanning rapid prototyping, architecture, and deploying/scaling on cloud platforms (AWS/Azure/GCP). London-based with WFH.

AI AWS Azure Cloud C++ +5 skills

Client Server Limited

Python Cyber Security Software Engineer

Salary: £40,000 - 70,000 per year Requirements Advanced Python and backend software engineering experience Advanced problem-solving and critical-thinking skills Interest in learning and adopting new technologies…

AI AWS Azure Cloud C++ +6 skills

Python Software Engineer Cyber Security

Overview In this Python Software Engineer role, you will help build a Greenfield AI cybersecurity product within the R&D team. You’ll mainly develop backend services in Python while evaluating Rust and other…

AI AWS Azure C++ Cybersecurity +4 skills

Client Server Limited

Python Software Engineer Conversational AI

RemoteUKFull-time

Python Software Engineer Conversational AI London, Greater London | £80k - £90k per year Python Software Engineer / Developer (Conversational AI) Remote UK to £90k Are you a backend focussed Python Software Engineer…

Agentic AI AI AWS Conversational AI Infrastructure as Code +4 skills

Founding Software Engineer Python - Start-up

Overview In this Founding Software Engineer role you will shape both technology and product in a fast-growing AI startup. You’ll own the design and development of cloud-native applications, spanning backend, frontend,…

Agentic AI AI API Azure CI/CD +10 skills

Founding Software Engineer (Python) - AI for Compliance

Client Server is seeking a Founding Software Engineer (Python) in the UK to help shape core technology and product in a fast-growing AI startup. You will own the design and build of cloud-native applications, spanning…

AI Azure CI/CD Cloud Cloud Native +2 skills

Client Server Limited

Backend Software Engineer Python LLM

RemoteUKFull-time

Backend Software Engineer / Developer (Python LLM) Remote UK to £90k Are you a backend focussed Software Engineer looking for an opportunity to progress your career, whilst working remotely on a modern tech stack? You…

Agentic AI AI AWS Conversational AI Infrastructure as Code +4 skills

Backend Software Engineer Python LLM

Overview In this remote-first Backend Software Engineer role, you will build and maintain production-grade AI systems and the supporting infrastructure. You’ll own technical decisions, contribute to the evolution of a…

AI AWS Cloud Conversational AI Infrastructure as Code +4 skills

Client Server Limited

Lead Full Stack Engineer TypeScript Python API

Lead Full Stack Engineer at a profitable London private equity firm, working at the intersection of tech, data, strategy and investment — leading data diligence and shaping tech/data strategy for portfolio companies. Day to day spans TypeScript and Python development, cloud data platforms (AWS/Azure/GCP) and agentic AI, hybrid with three days a week in the London office.

Agentic AI AI Analytics API AWS +5 skills

100K – 125K £

Client Server Limited

Lead Full Stack Engineer (TypeScript + Python) – Hybrid London

Lead a full stack engineering effort in London, blending hands-on TypeScript and Python API development with strategic leadership of data transformation across a private equity portfolio. Hybrid role with London office presence.

API Python TypeScript

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

Full Stack Engineer / Technical Lead B2B SaaS

Open 18d 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

Client Server Limited

Full Stack Engineer: .NET/JS in Sports Tech (Hybrid)

Open 21d HybridUK

Client Server Limited is recruiting a Full Stack Engineer in St Albans (hybrid, two days WFH per week) for a fast-paced sports tech business, paying up to £100k. Day to day you deliver backend and frontend features across a microservices ecosystem using C# .NET Core, JavaScript/TypeScript, Angular, AWS, Kubernetes and Kafka.

Angular AWS C# .NET JavaScript +4 skills

Client Server Limited

Full Stack Engineer .Net JavaScript - Sports Betting

Open 21d HybridUK

Full stack engineer building platforms used to analyse and trade on global sports markets: designing features across a microservices ecosystem with C# .NET Core on the backend and JavaScript/TypeScript with Angular on the frontend, using AWS, Kubernetes and Kafka. Office-based in St Albans with 2 days WFH per week; salary up to £100k.

Angular AWS Cloud C# Design Patterns +9 skills

Lead Backend Engineer - Technologist

Open 21d UKLead

Overview In this role you will lead backend engineering to design and implement core application logic, APIs and microservices for data processing and integrations, while ensuring secure, reliable server environments.…

API Api Design AWS Azure Cloud +13 skills

Senior Full Stack Developer TypeScript React API

Open 21d On-siteUKSenior

Overview As a Senior Full Stack Engineer in our new UK operation, you will own the architecture and build products from the ground up in a fast-growing sports tech environment. You’ll work hands-on across the stack,…

AI API React Rust TypeScript

Python Developer - Problem Solver

Backend Python developer role in a cybersecurity firm's R&D team near Cambridge (office twice a week), building a greenfield product that defends against AI-based attacks. Day to day: rapid prototyping, iterative backend development in Python with exposure to Rust and cloud platforms; salary to £65k.

AI AWS Azure C++ Cybersecurity +5 skills

Client Server Limited

Lead Backend Engineer - Technologist

Open 22d UKFull-timeLead

Lead Backend Engineer joining the consulting division of Client Server's Newcastle office, serving a scaling FinTech. Day to day: designing backend logic, building APIs and microservices (Python, TypeScript), maintaining secure server environments, mentoring engineers, and gathering requirements directly with clients. Full-time onsite, salary to £130k + bonus.

API AWS Azure CI/CD Cloud +16 skills

Client Server Limited

Lead Backend Engineer - Python/TypeScript (Onsite, Newcastle)

Open 22d UKLead

A hands-on lead role designing and building core applications and APIs for clients at a FinTech consultancy, based onsite in Newcastle. The engineer oversees secure server environments and architecture while mentoring others, working across Python, TypeScript, and C#.

API C# Fintech Python TypeScript