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Client Server

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57 jobs

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57 jobs Posted Sort

Client Server Limited

Backend Software Engineer Python LLM - Finance

NewBe an early applicant UK

Backend engineer at a finance technology consultancy serving global investment banks, designing autonomous AI systems: multi-modal LLM integration, agentic workflows with RAG and prompt engineering, model optimisation, and scalable MLOps pipelines. Core stack is Python with API development and cloud-native AI deployment.

Agentic AI Agile AI API Cloud +14 skills

Client Server Limited

Full Stack Developer JavaScript Vue.js C# .Net

NewBe an early applicant RemoteUK

Senior hands-on full stack developer at a global financial services company rebuilding its international payments platform. Focus is the Vue.js frontend with C# .NET backend work (~70/30), owning features end-to-end, leading technical decisions, and improving reliability in a microservices/AWS environment.

API AWS Cloud C# .NET +7 skills

Full Stack Developer JavaScript Vue.js C# .Net

NewBe an early applicant UK

Senior hands-on full-stack developer owning features end-to-end in a corporate payments product: roughly 70/30 Vue.js frontend and C#/.NET backend, with SQL, microservices and AWS. Leads architecture, modernises legacy services and mentors the team, working from home with occasional Bracknell office visits.

API AWS Cloud C# .NET +7 skills

Client Server Limited

Software Engineer Python Django Sql - Fintech

NewBe an early applicant HybridUKFull-time

Business-facing software engineer building internal platforms and applications with Python, Django, and SQL at a scaling London FinTech whose core product is a private equities / alternative investment management platform. Works across multiple teams and stakeholders, London-based, salary to £80k plus bonus.

Agentic AI AI API Django Fintech +2 skills

Client Server Limited

Founding Software Engineer Python - Start-up

NewBe an early applicant RemoteUK

Founding full-stack engineer at a fast-growing AI start-up building compliance and operational-efficiency products for the NHS and other regulated industries. You own architecture through deployment, working mainly in Python and TypeScript with FastAPI, React, LLM/agentic AI, and CI/CD on Azure.

Agentic AI AI API Azure CI/CD +10 skills

100K – 115K £

Client Server Limited

Software Engineer Python Genai Llm - Finance

NewBe an early applicant HybridUKContract

Senior Python engineer on a 12-month fixed-term contract at a global asset manager's Investment Technology Research team in London, prototyping and building reliable internal GenAI tools — RAG/retrieval workflows, MCP and tool integrations, and LLM evaluation. Hybrid: 3 days per week in the London office; salary to £180k.

Agentic AI API Claude Code Data Engineering Developer Experience +7 skills

Client Server Limited

Lead Backend Engineer - Technologist

NewBe an early applicant UKLead

Lead Backend Engineer at a scaling FinTech consultancy in central Newcastle (onsite, Mon-Fri): designing APIs and microservices, overseeing secure server environments, gathering client requirements, and mentoring the team. Broad tech stack including Python, TypeScript, C#/.NET, REST APIs, PostgreSQL, CI/CD and AWS/Azure/GCP; salary to £130k plus bonus.

API AWS Azure CI/CD Cloud +16 skills

Full Stack Developer JavaScript Vue.js C# .Net

NewBe an early applicant RemoteUK

Senior hands-on full-stack developer at a global financial services company rebuilding its international payments platform in the Corporate Payments division. You own features end-to-end — roughly 70% Vue.js frontend, 30% C#/.NET backend/API work — plus architecture decisions, mentoring, and improving reliability and observability. Hybrid: WFH most days, two days a week in Bracknell.

API AWS Cloud C# .NET +8 skills

Client Server Limited

Senior Full-Stack Engineer: Vue & C#.Net, Remote

New RemoteUKSenior

Senior full-stack engineer owning features end-to-end at a global financial services firm — primarily Vue front-end development alongside C#/.NET API and backend work, blending hands-on coding with architectural thinking. Mostly work-from-home with occasional days in the Bracknell, UK office.

API C# .NET Vue

Client Server Limited

Senior Full Stack Engineer Vue C# .Net

New RemoteUKSenior

Senior full-stack engineer at a global financial services company rebuilding its international payments platform, working in the Corporate Payments division. Own features end-to-end with a Vue.js frontend focus (70%) plus C# .NET backend/API work (30%), including architecture, reliability and mentoring. Hybrid: WFH most days, Bracknell office twice a week.

API AWS Cloud C# .NET +7 skills

Founding Software Engineer Python - Start-up

Founding engineer at a London/Cambridge startup who owns design and delivery of scalable cloud-native apps in Python and TypeScript, deployed on Azure, leveraging LLMs and agentic AI. Sets engineering practices, builds backend services, frontend components and CI/CD, and shapes product decisions alongside the founders.

Agentic AI AI API Azure CI/CD +11 skills

Client Server Limited

Senior Full-Stack Tech Lead – Ruby/TS/React, B2B SaaS, Remote

New HybridUKLead

Senior full-stack engineer / technical lead owning technical strategy and architecture for developer ecosystems, centered on API and SDK design. Day to day: driving the full development lifecycle with Ruby, TypeScript and React, mentoring engineers, reviewing contributions, and collaborating with the developer community. Hybrid London/remote, package to £130k.

API React Ruby TypeScript

Client Server Limited

Senior Full Stack Engineer Vue C# .Net

New RemoteUKSenior

Senior full-stack engineer at a global financial services company rebuilding its international payments platform: owns features end-to-end with roughly 70% Vue.js frontend and 30% C#/.NET backend/API work, using AWS, microservices and SQL. Mostly work-from-home with two days a week in the Bracknell office.

API AWS Cloud C# .NET +7 skills

Client Server Limited

Full Stack Engineer / Technical Lead B2B Saas

Technical lead role at a B2B SaaS provider of serverless real-time infrastructure that processes billions of messages daily. You'd own technical strategy and architecture for developer ecosystems, define API/SDK design standards, lead cross-team initiatives, and mentor engineers. Core stack: Ruby, TypeScript, React; mostly remote with monthly meetups at a North London office.

AI API Automation Design Patterns iOS +8 skills

Lead C# & .NET Core Backend Engineer (Hands-on Leader)

A hands-on lead backend engineer role in Newcastle upon Tyne: you own C#/.NET Core backend systems, architect APIs and microservices, and mentor a growing team while guiding technical decisions and roadmaps. Onsite position with competitive package and bonus potential.

API C++ C# .NET Java +2 skills

Client Server Limited

Lead Python Developer & Team Lead - FinTech, Hybrid London

Lead Python Developer & Team Lead in London (hybrid) heading a small team on a core banking platform: delivering features, refactoring, and blending architecture/design with people management and mentoring. Core stack: Python, FastAPI, cloud services, and SDLC; a STEM degree (2.1+) is required.

API Cloud FastAPI Python SDLC

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

Software Engineer Python Django SQL - FinTech

HybridUKFull-time

Python developer at a scaling London FinTech whose core product is a private equities / alternative investment management platform. Day to day you build internal platforms and apps with Python, Django and SQL, work directly with business stakeholders, and own projects end to end. London-based role with salary to £80k plus bonus.

Agentic AI AI API Django Fintech +2 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

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