/

Point your AI agent at freehire and let it find you a job. A CLI and an MCP server over the whole job API — no browser.

Get the CLI →

Client Server

Jobs Hiring Closed Discussion

55 jobs

Posted Sort

55 jobs Posted Sort

C# Developer SQL ASP.Net - Tech Start-up

C# Developer joining a five-person London start-up building an online platform that connects customers with certified tradespeople. Day-to-day software engineering with C#, ASP.Net and SQL, working closely with an experienced CTO, onsite in Central London with a salary up to £50k.

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

Client Server Limited

Real-Time Backend Engineer (C#/.NET) – Trading, London Onsite

Design and build real-time trading systems for Client Server Limited in London, focusing on C#/.NET backend and API development with occasional JavaScript/React frontend work. An onsite role collaborating with the strategy team on greenfield projects you own end-to-end, paying up to £90k plus bonus.

API C# .NET JavaScript React

Client Server Limited

Backend Engineer (C#/.Net Core) – Growth, Perks & Newcastle

Builds robust backend services in distributed systems handling large data volumes using C#/.NET Core, contributing across the full software development lifecycle. Onsite role in Newcastle upon Tyne within a FinTech environment, Monday-Friday 09:00-18:00, with salary to £130k plus discretionary bonus.

C# Distributed Systems .NET Fintech

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.

Platform Engineer Azure IaC C# .Net

Platform Engineer (Azure IaC C# .Net SaaS) Reigate / WFH to £105k Are you a senior Platform Engineer with a strong knowledge of Azure who enjoys collaborating and getting things done? You could be progressing your…

Azure C# .NET Fintech Infrastructure as Code +1 skills

Full Stack Developer .Net Core AWS React

HybridUKFull-time

Full-stack developer building scalable, secure backend systems in C# .NET Core and working with AWS cloud infrastructure (Docker, Terraform) within an Agile team. Hybrid role based in Sunderland with 2-3 office days per week, paying up to £55k plus quarterly bonus; React featured in the role title.

Agile AWS Cloud C# Docker +3 skills

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

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

Backend Engineer - C# .NET Core | FinTech (Newcastle)

Backend engineer building high-performance C# .NET Core services and distributed systems that handle large data volumes for a FinTech client, onsite in brand-new Newcastle offices. The role covers the full SDLC with flexible hours and a focus on quality, robust software.

C# Distributed Systems .NET Fintech SDLC

Client Server Limited

London Backend Engineer (C#/.NET) - Sports Trading, Onsite + Bonus

Backend Engineer (C#/.NET) joining a sports trading team onsite in London, building robust backend systems, APIs and data flows for high-availability trading. Core stack: C#/.NET, ASP.NET, and SQL or Oracle.

API C# .NET Oracle SQL

Client Server Limited

Hybrid C#/.NET Full-Stack Engineer | AWS Microservices

A C#/.NET full-stack engineer builds high-scale .NET Core backend services using AWS microservices and real-time data for sports analytics and trading platforms. This is a hybrid role near St Albans with two days per week working from home.

Analytics Cloud C# .NET

100K – 100K £

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

Client Server Limited

Senior C# .NET API Engineer – Full-Stack, Remote

Senior C# engineer owning features end-to-end: designing scalable .NET APIs and backend services, building Vue.js frontend components, and driving architectural decisions while mentoring others and modernising legacy systems. Remote-friendly, with office presence twice weekly in Bracknell.

API C# .NET Vue

Client Server Limited

Backend Engineer (C#/.NET) - Trading Systems, London

Backend engineer building high-performance trading systems in C#/.NET with SQL for a hedge fund technology team in London, collaborating with quantitative researchers on valuation and pricing components and owning projects from design through delivery.

Lead C# Developer .Net - FinTech

Hands-on Lead C# Developer role building and leading development of complex, scalable C#/.NET desktop applications for a global fintech. Based in Reigate, Surrey with hybrid working (3 days a week from home), paying up to £100k plus a ~20% bonus.

C# .NET Fintech

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 C# Vue.js

Open 21d UKSenior

Overview In questa role you will own and deliver features end-to-end across the tech stack for an international payments platform within a global financial services group. You’ll design scalable backend services in C#…

API AWS CI/CD C# Distributed Systems +13 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