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Client Server

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294 jobs

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294 jobs Posted Sort

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

Lead Backend Engineer: Architect APIs & Microservices

Lead Backend Engineer at Client Server Limited in Newcastle upon Tyne, designing and implementing APIs and microservices, managing secure server environments, and providing architectural leadership while liaising with clients. Core stack: C#, .NET, Python, TypeScript, and REST APIs in a consultancy setting.

API C# .NET Microservices Python +2 skills

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

Backend Software Engineer Python - Technologist

Backend Software Engineer joining the R&D team of a cybersecurity firm that uses AI to defend against AI-based attacks, building a new greenfield product. Mostly backend Python with some Rust/TypeScript/C++ and cloud (AWS/Azure/GCP); hybrid role based in the Cambridge office two days a week. Salary to £80k plus bonus.

AI AWS Azure C++ Cybersecurity +5 skills

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 Developer / Consultant SaaS

A senior hands-on Python developer/consultant who builds cloud-based SaaS applications for legal firms using Python (FastAPI) and AWS, owning client bespoke projects end-to-end. Hybrid role based in Central Manchester (3 days office/client sites, 2 WFH), salary up to £80k.

AWS CDK Cloud DevOps FastAPI +3 skills

Systems Engineer, SRE (Golang) – FinTech

Salary: £100,000 - 100,000 per year Requirements: Degree educated, with a 2:1 or above in a STEM discipline from a top-tier university Strong Systems Engineering skills and Go/Golang coding ability Experience designing…

API Go Observability SRE

Client Server Limited

Backend Software Engineer Python R&D

Backend Python engineer in the R&D team of a Cambridge cybersecurity firm building a greenfield product to combat AI-based security attacks. Day to day is rapid prototyping and platform development, mainly in Python with exposure to Rust and cloud platforms, hybrid from the Cambridge office twice a week.

AI AWS Azure C++ Cybersecurity +5 skills

Engineering Manager Big Data

UKFull-timeC-level

2 days ago Be among the first 25 applicants Get AI-powered advice on this job and more exclusive features. This range is provided by Client Server. Your actual pay will be based on your skills and experience — talk…

Agile AI Azure Big Data Data Engineering +4 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

Remote Python Backend Engineer — AI & LLM Systems

Backend engineer building production-grade Python backend services and AI/LLM workflows that power conversational AI, working with AWS, TypeScript, Node.js, and asynchronous Python. Remote-first within the UK with flexible hours and monthly team meetups.

AI AWS Conversational AI Node.js Python +1 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

Software Engineer Python AI - Renewable Energy

An in-house engineer at a rapidly scaling UK renewable energy business builds AI and conventional software for teams across development, asset management, trading and investment — taking ambiguous problems from discovery through prototyping to production. Core stack: Python, APIs, data integration, LLMs/retrieval, CI/CD; London office with 2 days WFH.

Agentic AI AI API Automation CI/CD +4 skills

90K – 120K £

Client Server Limited

python developer in cybersecurity

A Python backend developer in London building a greenfield cybersecurity product that defends against AI-based attacks. Day to day involves rapid prototyping, structured platform development, and solving complex problems using Python, cloud platforms (AWS/Azure/GCP), and some Rust, TypeScript, or C++.

AI AWS Azure C++ Cybersecurity +4 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

Software Engineer Python AI - Renewable Energy

Design, build and run production Python software that applies AI/LLMs, APIs and data integration to real problems at a fast-scaling renewable energy company — prototyping from PoC to production and owning reliability, monitoring and security. Hybrid role based in London, salary up to £120k.

Agentic AI AI API Automation LLM +2 skills

Client Server Limited

Python Backend Engineer — Cybersecurity R&D (Greenfield)

Client Server Limited is hiring a Python backend engineer to build a greenfield product in its cybersecurity R&D team near Cambridge, UK. Day to day is Python backend development with the chance to explore Rust and emerging technologies, in a hybrid setup with two office days per week in Cambridge.

Data Engineer Quant Finance

Builds and maintains data pipelines, models, and infrastructure that power Quant and Data Science teams at a financial-markets research company, working with large complex datasets primarily in Python and SQL. The role offers a path toward growing data science/quantitative responsibilities over time.

Data Engineering Data Modeling Data Pipelines Data Quality Data Science +2 skills

Software Engineer Python Django SQL - FinTech

HybridUKFull-time

Builds internal platforms and applications for a scaling FinTech product serving investment management, using Python, Django and SQL. The engineer collaborates with stakeholders to translate requirements into scalable solutions and owns projects end to end in a hybrid London role.

Agentic AI AI API Django Fintech +3 skills

Lead Full Stack Engineer TypeScript Python API

Lead engineer driving data and technology strategy across a private equity portfolio: running data diligence, maturing portfolio companies' data capabilities and delivering data projects that support value creation. Core tech is TypeScript and Python for API development, with cloud (AWS, Azure, GCP) and AI/agentic programming.

Agentic AI AI Analytics API Api Design +7 skills