Company · 61 open roles
Careers at Client Server
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61 positions at Client Server
Application Security Engineer JavaScript
Client Server·The Mall, The City
<p><b>Salary: £80,000 - 80,000 per year</b></p> <b>Requirements:</b> <ul><li>We have strong experience in web application security and offensive security testing.</li><li>We have hands-on expertise in penetration testing and reverse engineering.</li><li>We have a deep und…
Software Engineer Java API Kafka AWS
Client Server·Cheapside 80, London
<p><b>Salary: £40,000 - 70,000 per year</b></p> <b>Requirements:</b> <ul><li>Strong Java server-side development experience</li><li>Good knowledge of messaging, including Kafka experience</li><li>AWS experience</li><li>Good knowledge of SQL, ideally PostgreSQL</li><li>Exp…
JavaScript Developer Angular Tech for Good
Client Server·Cheapside 80, London
<p><b>Salary: £40,000 - 70,000 per year</b></p> <b>Requirements:</b> <ul><li>We are looking for someone with front end experience in JavaScript and modern Angular; we use Angular 21.</li><li>We need experience with relational databases and SQL query writing.</li><li>We ne…
Lead Software Engineer C#.Net
Client Server·Cheapside 80, Reigate
<p><b>Salary: £40,000 - 70,000 per year</b></p> <b>Requirements:</b> <ul><li>Expertise with C# .NET Core backend software development on large, scalable systems with complexity</li><li>Strong technical leadership experience, taking ownership of features rather than managi…
Full Stack Engineer C#.Net Agentic AI
Client Server·Cheapside 80, Reigate
<p><b>Salary: £40,000 - 70,000 per year</b></p> <b>Requirements:</b> <ul><li>Strong full stack development experience with C# .Net and modern front end technologies such as JavaScript or TypeScript</li><li>Experience building cloud-based SaaS applications</li><li>Hands-on…
Senior Backend Developer Node.js TypeScript
Client Server·Warwick Street 104, Deritend
<p><b>Salary: £80,000 - 80,000 per year</b></p> <b>Requirements:</b> <ul><li>Strong backend software engineering experience with Node.js and TypeScript</li><li>Experience with Kafka and event-driven architectures</li><li>Good knowledge of microservices, RESTful APIs, and …
Principal Java Developer
Client Server·Cheapside 80, London
<p><b>Salary: £40,000 - 70,000 per year</b></p> <b>Requirements:</b> <ul><li>Experience within a financial services or Fintech environment</li><li>Strong Java development skills, including multi-threading and concurrency</li><li>Experience with Spring Boot and microservic…
Senior AI Engineer - Finance
Client Server·Cheapside 80, London
<p><b>Salary: £40,000 - 70,000 per year</b></p> <b>Requirements:</b> <ul><li>Strong senior-level software engineering experience with Python and TypeScript</li><li>Genuine enthusiasm for AI and interest in applying it in a real-world financial setting</li><li>Experience i…
Data Engineer Python SQL Spark
Client Server·Cheapside 80, London
<p><b>Salary: £40,000 - 70,000 per year</b></p> <b>Requirements:</b> <ul><li>We are looking for a Data Engineer with a first-class degree in a STEM discipline from a top-tier university, supported by strong A-level results.</li><li>We want someone with experience in a sim…
Backend Software Engineer Python LLM Finance
Client Server·Cheapside 80, Spitalfields
<p><b>Salary: £90,000 - 90,000 per year</b></p> <b>Requirements:</b> <ul><li>We require strong Python software engineering experience, including API development.</li><li>We require hands-on experience deploying LLMs and multi-modal models at scale in production.</li><li>W…
Front End Developer (TypeScript, React) - FinTech
Client Server·Clarence Street, Shieldfield
<p><b>Salary: £100,000 - 100,000 per year</b></p> <b>Requirements:</b> <ul><li>Minimum 2.1 BSc in Computer Science from a Russell Group university</li><li>Strong front end development experience with TypeScript and React</li><li>Good knowledge of modern software engineeri…
Lead Python Developer
Client Server·Broadwick Street 14, Soho
<p><b>Salary: £100,000 - 100,000 per year</b></p> <b>Requirements:</b> <ul><li>Skilled Python Developer with team leadership experience</li><li>Strong knowledge of software engineering best practices</li><li>Full SDLC experience</li><li>Team leadership experience, includi…
Senior C# Developer .NET Core - FinTech
Client Server·Portsmouth Road, Tyne and Wear
<p><b>Salary: £40,000 - 70,000 per year</b></p> <b>Requirements:</b> <ul><li>Strong experience in C# and .Net Core development</li><li>Strong academic background</li><li>Experience with backend-focused software engineering</li><li>Familiarity with complex system architect…
Backend Software Engineer C#.Net
Client Server·Clavering Place, Newcastle upon Tyne
<p><b>Salary: £40,000 - 70,000 per year</b></p> <b>Requirements:</b> <ul><li>You must have achieved a minimum 2.1 BSc in Computer Science or a similar technical discipline from a top-tier university, backed by As at A-level.</li><li>You are a technologist who enjoys colla…
Senior Python Software Engineer / Consultant
Client Server·Coverdale Crescent, Ardwick
<p><b>Salary: £80,000 - 80,000 per year</b></p> <b>Requirements:</b> <ul><li>We want someone with experience working directly with clients and taking ownership of bespoke development work.</li><li>We want strong backend Python development skills, ideally including FastAPI…
Technical Consultant C++ Linux Networking
Client Server·V7 Saxon Gate, Milton
<p><b>Salary: £60,000 - 60,000 per year</b></p> <b>Requirements:</b> <ul><li>Experience developing software using C / C++ for cross-platform use</li><li>Good understanding of networking programming, protocol design, compression, security, and multithreaded programming</li…
Lead Full Stack Engineer Golang React API
Client Server·Charing Cross, North West London
<p><b>Salary: £95,000 - 95,000 per year</b></p> <b>Requirements:</b> <ul><li>Strong hands-on full stack software engineering experience with Golang, React, REST APIs, and GCP and/or AWS</li><li>Good knowledge of CI/CD, DevOps practices, and IaC tools such as Terraform</li…
Python Developer - Geospatial Image Processing
Client Server·Cheapside 80B, Chelworth
<p><b>Salary: £85,000 - 85,000 per year</b></p> <b>Requirements:</b> <ul><li>Strong Python backend development skills</li><li>Good knowledge of geospatial or image processing technology</li><li>Comfortable using AI tools such as Claude in your everyday workflow</li><li>Ex…
Lead Backend Engineer
Client Server·Clarence Street, Shieldfield
<p><b>Salary: £100,000 - 100,000 per year</b></p> <b>Requirements:</b> <ul><li>We require a minimum 2.1 BSc in Computer Science or a similar technical discipline from a top-tier or Russell Group university, backed by A-level grades of A or equivalent.</li><li>We require s…
Senior Software Engineer Node.js
Client Server·Coverdale Crescent, Ardwick
<p><b>Salary: £80,000 - 80,000 per year</b></p> <b>Requirements:</b> <ul><li>Strong backend software engineering experience with Node.js and TypeScript</li><li>Experience with Kafka and event-driven architectures</li><li>Good knowledge of microservices, RESTful APIs, and …
Senior Python Developer Cyber Security
Client Server·V7 Saxon Gate, Milton
<p><b>Salary: £80,000 - 80,000 per year</b></p> <b>Requirements:</b> <ul><li>Advanced Python backend software engineering experience</li><li>Advanced problem-solving and critical thinking skills</li><li>Enjoy learning and picking up new technologies</li><li>Experience wit…
C++ Developer
Client Server·Primrose Street 20, Broadgate
<p><b>Salary: £100,000 - 100,000 per year</b></p> <b>Requirements:</b> <ul><li>Strong commercial C++ development experience</li><li>Front office capital markets experience with a good understanding of trade flows, the trade lifecycle and FIX protocol</li><li>Strong SQL sk…
Senior Software Engineer C++ Trading Systems
Client Server·Primrose Street 20, Broadgate
<p><b>Salary: £100,000 - 100,000 per year</b></p> <b>Requirements:</b> <ul><li>Strong commercial C++ development experience</li><li>Front office capital markets experience with a good understanding of trade flows, the trade lifecycle, and FIX protocol</li><li>Strong SQL s…
Java Developer Kafka API - Tech Consultancy
Client Server·Primrose Street 20, Broadgate
<p><b>Salary: £90,000 - 90,000 per year</b></p> <b>Requirements:</b> <ul><li>Java development skills including multi-threading and concurrency</li><li>Experience with Spring Boot and microservices environments</li><li>Experience with Kafka or similar messaging tools</li><…