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Location: 3 days p/week in London.Developer - would you like the opportunity to work for a FinTech Start-up who are looking to change how insurance payments flow? This is an exciting opportunity for a Senior Node.Developer to join an organisation, where you will work directly with their highly ex...

I am working with a new scaleup client in the exciting healthtech space that has helped over 1 million patients to date, with applications in subscription, fitness and tracking, across a number of conditions.They are on an exciting scale-up journey following growth and investment rounds.They are ...

Build new features using native Android tools in partnership with design, backend, and product teams. Deep understanding of native Android development, frameworks, and tools. Senior Android Engineer - £100K (FinTech / Challenger Bank).

Location: 3 days p/week in London.Developer - would you like the opportunity to work for a leading media/events organisation? This is an exciting opportunity for a Senior Node.Developer to join an organisation, where you will work directly with their highly experienced Head of Engineering.Develop...

Multiple Remote Engineering Roles – Ruby on Rails | Hotwire | Turbo | Stimulus. Senior Backend Engineer (Ruby on Rails). Senior Full Stack Engineer (Ruby on Rails + Frontend).

Mid-Senior Backend Developer (Node.Would you like the opportunity to join a rapidly growing organisation who have doubled in size every 12 months for the past few years.They’re currently looking for a Software Engineer who has experience working with a loosely service based Node.This opportunity ...

Software Engineer - London, 2 days on site.My client is building AI voice tech and need a hands-on engineer to help us scale.You’ll work across the stack (mostly backend), ship features, and own your work—no micromanagement here.Build and maintain full-stack features (with a backend focus).Integ

Senior Software Engineer – AI Startup – Up to 120k 🚀🧠. Python, Flask, FastAPI, React, TypeScript, GCP (Backend Leaning). Our y-combinator backend client are building an elite engineering team within the AI space.

Software Engineer – AI Startup – Up to 85k 🚀🧠. Python, Flask, FastAPI, React, TypeScript, GCP (Backend Leaning). Our y-combinator backend client are building an elite engineering team within the AI space.

Strong Python backend experience (Flask, Kafka, Docker, Kubernetes). AI Engineer (with a focus on Python/Backend development). Own backend Python services and contribute to a growing AI capability across the business.

Python Developer (AI + Backend). AI Engineer and AI Ambassador just after a year. Shape the future of AI - influencing architecture, research, and cross-team learning.

Senior Full-Stack Engineer (TypeScript & LLM Integration). Build and maintain web application features using TypeScript, React, Node + Next. Develop and maintain type-safe RPC endpoints using tRPC and TypeScript to ensure smooth frontend-backend communication.

Are you a hands-on technical leader who thrives at the intersection of frontend and backend development? We're looking for a Lead Full Stack Engineer to help shape the future of digital products in a fast-paced, forward-thinking environment. This person will act as the Tech Lead and Product Owner...

Work across financial intelligence with a well-established team of engineers - for the first 12 months, work with a 70/30 split between backend SE and AI - before growing into the company's go-to AI Engineer just after a year. Build and deploy scalable AI-driven solutions for wealth management/in...

Could come from roles like Senior Backend Engineer or Senior Full Stack Engineer. The Senior Software Engineer will have:. Working for an industry leading, high-growth SaaS business with some of the biggest brand names in the world as customers, the Senior Software Engineer will build innovative ...

Proven backend experience with C# (. We’re hiring for a Product Engineer (backend C#. The role will focus on backend development that blends email, chat, telephony, voice AI and LLMs.

We are an early-stage fintech startup (not rebuilding but) re-wiring the global payments infrastructure. We’re an early-stage fintech startup, backed by industry insiders, with deep experience in the financial ecosystem. Experience working in small teams or startups, where autonomy and speed matt...

The Platform Engineer will work closely with product teams and fellow engineers to improve developer experience, scalability, and reliability across the stack. Platform Engineer – Key Requirements:. Strong professional experience in platform, infrastructure, or backend engineering.

Tech leads/Software Team Leads🌳🌳🌳. My client is growing a brand-new team and needs solid software engineers to help with the development of large-scale mobile and web applications backend. Experience in a Software Team Lead or Staff Engineer position but would consider a lead Engineer.

At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn.

As a Lead Software Engineer you will provide technical leadership to two mid-senior Backend Software Engineers and remain hands-on with architecture, design and coding. Lead Software Engineer / Developer (C#. Lead Software Engineer / Developer (C#.

The role involves the design and development of backend infrastructure for Machine Learning workloads.

Backend Engineer for Content Curation/Labeling – 6 month Contract – Remote – 55 GBP per Hour. The team needs a backend engineer who is well-versed in LLMs: prompt engineering, scripting jobs, retrieval-augmented generation, and automated data processing. Automation: crafting scripts and system

Backend-Leaning Full-Stack Engineer – AI x LegalTech | £150,000 + Equity | 5 Days/Week in Central London. They’re hiring a backend-leaning full-stack engineer to build the infrastructure powering novel, AI-driven workflows, from scratch. Architect secure, scalable backend infrastructure.

At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn.

Backend Software Engineer / Developer (Golang Kafka API) London / WFH to £110k. Do you have a deep knowledge of Go / Golang combined with software architecture and design skills?. You're an experience backend focussed Software Engineer with strong commercial Go / Golang development experience.

With offices across the globe, they are looking to hire further Senior Fullstack Engineers to join their dynamic team in London. As a Senior Fullstack Engineer you'll contribute to a growing platform, playing a pivotal role in shaping the backend (Node.

Build scalable APIs with FastAPI (or similar), Python, and modern web tooling. Strong backend skills — Python, REST APIs, FastAPI. We’re looking for a Senior Software Engineer to lead development of a high-performance API platform that serves machine learning models at scale.

Lead Software Engineer – UK Remote | £80,000 to £85,000 | Hands-on Leadership in Scalable Systems w/API Design. Leading technical delivery within backend software projects. Managing or supporting connected devices or remote systems.

Our client, a global organisation, urgently require a number of experienced Back End Developers to join their team on a permanent basis working with their Central Government clients. Highly experienced back end developer, with experience in working on Government or Defence applications (DV Cleare...

Senior Software Engineer / Developer (Go Golang) London / WFH to £100k. Are you a senior, backend focussed Software Engineer with strong Go / Golang coding skills and real-time messaging experience?. You have strong Go / Golang coding skills.

Senior Engineers, Head of Engineering & CEO. Senior Product Engineer (Backend leaning). Senior Product Engineer required on a Permanent basis for an early stage startup that sits in the juncture between Sales, Data & AI, building a chrome extension which can be used by some of the largest sales t...

Staff Software Engineer - Backend - London Hybrid. They’re looking for a Staff Backend Engineer to join their team. The company has both web and mobile platforms, and as a Staff Backend Engineer, you'll take a leading role in supporting these growing platforms.

Software development experience preferably in backend systems – current tech stack is Golang and they are open to other backend technologies. Good engineering principles include unit, integration and end-to-end testing. Senior Backend Engineer – Join a scaling FinTech – Take ownership of a new

Senior Full Stack Engineer (Backend-Leaning). Own end-to-end feature development with a backend focus. Collaborate closely with product, design, and engineering teams.

Reporting into an Engineering Manager, the Senior Backend Engineer will also leverage modern technologies like AWS, Kubernetes, Docker, and Kafka, whilst also architecting and implementing microservices-based solutions in collaboration with cross-functional teams. In addition, the Senior Backend ...

Founding Team: Senior Backend Engineer. Help define and develop the core backend systems that will underpin our product, connecting blockchain and fintech systems in novel ways. Senior/staff engineering experience with a focus on creating scalable, resilient backend systems.

Role: Senior Backend Software Engineer. As a Backend Software Engineer, you will work on a powerful network orchestration platform designed for highly dynamic, global-scale connectivity systems. Build and optimize software for cloud, on-prem, and hybrid deployments.

Are you a seasoned backend engineer who’s ready to take the reins on a platform with big ambitions and serious clients? This is a chance to step into a senior development role with impact, autonomy, and the opportunity to shape the future of a rapidly evolving product.

They are now looking for Senior Go Engineer Contractors to join on a 3 month basis. Contract Senior Backend Engineer (Go). Are you a Senior Go Engineer and want to join a mission-led FinTech?.

Lead Backend Engineer | Python | On-site | 90k - 110k Dependent On Experience.

Java backend experience, DevOps awareness, and proven technical leadership capabilities to join our Client’s London team. This is a high-impact role involving the design, development, and deployment of backend services that power our client’s security platform. Design, develop, and maintain Java

Role 2 - Backend Software Engineer. As a Junior Backend Software Engineer, you will be designing and implementing scalable, high-performance infrastructure services, APIs and integrations. Circa 2 years of commercial or equivalent experience in a software development role building cloud-driven SA...

Significant professional experience in software development, with a strong focus on backend systems. If you're a passionate Backend Engineer who enjoys working autonomously, taking ownership, and building for impact in a high-trust, high-collaboration setting - apply now! Our client is looking to...

We’re looking for Software Engineers to join our Joule Direct team, to help us build and improve our high-throughput, low-latency energy trading platform.You’ll be working with some amazing technologists to solve complex problems.For us, teamwork is everything.We listen to each other, we adapt,

Senior Full Stack Engineer | VC Funded Gifting/Rewards | Remote. We are looking for a backend leaning Senior Full Stack Engineer, proficient in. If you are a Senior Full Stack Engineer looking to join a thriving company working to improve employee satisfaction across the country, this will be a p...

Contract Opportunity: Senior Backend Engineer (Golang). Month Rolling Contract – High Extension Potential. This is a high-impact role within a well-established engineering team, focused on building scalable systems using.

You’ll be part of a small, high-agency team designing the backend infrastructure for a deeply technical product — one that could redefine how robots, rockets, vehicles, and machines are developed over the next decade. The Role – Founding Backend Engineer. You’ll be responsible for designing