Software Engineering Jobs in United Kingdom

There are 5,892 open Software Engineering jobs in United Kingdom on freehire right now. 1,548 of them were posted recently. The skills employers ask for most often are cloud, python and ai.

Salary

CurrencyPeriod25thMedian75thPostings
GBPyear£60,000£77,500£100,000406
GBPday£472£625£70044
USDyear$166,100$192,750$215,00038
EURyear€96,850€113,850€124,84515

From postings that disclose pay. Currencies are counted separately, never converted.

Most requested skills

  • cloud 33%
  • python 30%
  • ai 30%
  • java 30%
  • api 28%
  • ci-cd 23%
  • aws 22%
  • agile 22%

How the work is done

  • Hybrid 1,195 · 20%
  • Remote 381 · 6%
  • Onsite 166 · 3%

Visa sponsorship offered in 51% of the 636 postings that state a position on it.

Seniority

  • Senior 1,704
  • Lead 442
  • Staff 214
  • Principal 179
  • Junior 146
  • Middle 114

Who is hiring

  • 1000+ employees 726
  • 501-1000 employees 402
  • 51-200 employees 204
  • 11-50 employees 112
  • 201-500 employees 36
  • 1-10 employees 15
5,892 jobs
callosum
2 weeks ago

ML Research Scientist - Member of Technical Staff

On-siteUKFull-time Licensed UK sponsor — This employer appears on the GOV.UK register of licensed sponsors for the Skilled Worker and related work routes. The licence belongs to the employer and is not a commitment to sponsor this role.
United Kingdom

Callosum is seeking an ML Research Scientist to develop foundational intelligent systems by researching model architectures, learning algorithms, and efficient training methods. The role involves end-to-end research ownership, from hypothesis generation to large-scale implementation, working across a full-stack infrastructure.

Agentic AI AI Machine Learning Python PyTorch
101 000 – 192 000 £
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callosum
2 weeks ago

Research Engineer, Evals - Member of Technical Staff

On-siteUKFull-time Licensed UK sponsor — This employer appears on the GOV.UK register of licensed sponsors for the Skilled Worker and related work routes. The licence belongs to the employer and is not a commitment to sponsor this role.
United Kingdom

Research Engineer building benchmarks and evaluation suites for agentic AI systems—designing rigorous measures for multi-turn, tool-using LLMs, turning traces into structured evidence, and building evaluation/observability infrastructure the whole company relies on.

Agentic AI AI LLM Machine Learning Observability
101 000 – 192 000 £
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callosum
2 weeks ago

Agent Runtime & Systems - Member of Technical Staff

On-siteUKFull-time Licensed UK sponsor — This employer appears on the GOV.UK register of licensed sponsors for the Skilled Worker and related work routes. The licence belongs to the employer and is not a commitment to sponsor this role.
United Kingdom

Builds the runtime and programming model for long-running AI agents that run for weeks across distributed infrastructure, focusing on durability, observability, and secure tool execution.

AI API Api Design C++ Distributed Systems +10 skills
101 000 – 192 000 £
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callosum
2 weeks ago

ML Research Engineer - Member of Technical Staff

On-siteUKFull-time Licensed UK sponsor — This employer appears on the GOV.UK register of licensed sponsors for the Skilled Worker and related work routes. The licence belongs to the employer and is not a commitment to sponsor this role.
United Kingdom

ML Research Engineer at Callosum designing experiments to understand why agentic AI systems fail, building evaluation infrastructure, and publishing findings to improve heterogeneous model/hardware orchestration.

Agentic AI AI Distributed Systems LLM Observability +1 skills
101 000 – 192 000 £
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callosum
2 weeks ago

Evolutionary Optimisation - Member of Technical Staff

On-siteUKFull-time Licensed UK sponsor — This employer appears on the GOV.UK register of licensed sponsors for the Skilled Worker and related work routes. The licence belongs to the employer and is not a commitment to sponsor this role.
United Kingdom

Build and improve an LLM-guided evolutionary search system that iteratively generates, evaluates, and optimises programs across kernels, inference runtimes, and scheduling policies, working with optimisation and search algorithms at an AI infrastructure startup in London.

AI LLM Machine Learning
101 000 – 192 000 £
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callosum
2 weeks ago

Research Engineer, Benchmarking - Member of Technical Staff

On-siteUKFull-time Licensed UK sponsor — This employer appears on the GOV.UK register of licensed sponsors for the Skilled Worker and related work routes. The licence belongs to the employer and is not a commitment to sponsor this role.
United Kingdom

Build and own a unified benchmarking system for evaluating agentic and algorithmic LLM solutions at Callosum's London office, using Python, sandboxed execution, and distributed systems to produce reproducible, contamination-controlled evaluation results.

Agentic AI AI LLM Machine Learning Python
101 000 – 192 000 £
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callosum
2 weeks ago

Networking & Interconnect Systems - Member of Technical Staff

On-siteUKFull-time Licensed UK sponsor — This employer appears on the GOV.UK register of licensed sponsors for the Skilled Worker and related work routes. The licence belongs to the employer and is not a commitment to sponsor this role.
United Kingdom

Build the networking and interconnect systems that let heterogeneous AI accelerators communicate efficiently, spanning RDMA, programmable NICs, memory movement, and cluster fabric strategy at Callosum's London office.

AI Ethernet Networking
101 000 – 192 000 £
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Interact Consulting Limited
2 weeks ago

Senior Java Software Engineer Inside IR35

HybridUKContractSenior
United Kingdom

The Senior Java Software Engineer will design, develop, and deliver scalable, high-quality software solutions while mentoring junior team members and leading technical discussions. This is a hybrid contract role based in West London.

Java
Extrac.ai
2 weeks ago

Software Engineer (AI)

UK
United Kingdom

ExTrac is seeking a software engineer to build and maintain agentic AI features and analytical tools for intelligence analysts using Python and Go. The role involves end-to-end development of production-grade services, including agent orchestration, retrieval systems, and streaming pipelines.

Agentic AI AI Analytics API Assembly +11 skills
75 000 – 80 000 £
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Extrac.ai
2 weeks ago

Senior Software Engineer (AI)

UKSenior
United Kingdom

The Senior Software Engineer will build and maintain production-grade agentic AI systems and analytical features using Python and Go. The role involves end-to-end service ownership, including designing APIs, managing storage layers, and ensuring system reliability for intelligence analysts.

Agentic AI AI Analytics API Assembly +12 skills
87 000 – 93 500 £
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SThree UK
2 weeks ago

Mid-Senior Software Developer (.NET / Python)

UKSenior
United Kingdom

This role involves designing and developing scalable software platforms for logistics and industrial automation using .NET and Python. The developer will build backend services, integrate with robotics and warehouse systems, and support the full software development lifecycle.
Experis UK
2 weeks ago

Digital Application Developer London

HybridUKFull-time
United Kingdom

Digital Application Developer building customer-facing web and mobile applications using React, TypeScript, and modern JavaScript within a cross-functional team following the full SDLC.

up to 90 000 £
The Opportunity Hub UK
2 weeks ago

Web Developer

UK
United Kingdom

Fantastic opportunity for Developers! The Opportunity Hub UK is delighted to announce that we are actively seeking motivated individuals to join the dynamic team of a growing retail investment tech company as a Web…
Fruition Group
2 weeks ago

Senior Java Developer

RemoteUKSenior
United Kingdom

The Senior Java Developer will work on evolving a SaaS platform for a growing fintech company. The role is fully remote with quarterly team meet-ups.

Java SaaS
85 000 – 110 000 £
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Computappoint
2 weeks ago

Software Engineer (Data Platforms & Automation)

HybridUKContract
United Kingdom

Builds scalable data platforms and automation pipelines for a fintech client, focusing on ETL, search, analytics, and infrastructure optimization.

Analytics Ansible API Automation C# +13 skills
up to 650 £ / day
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VANRATH
2 weeks ago

C#/.NET Software Engineer | AWS | Modern Cloud Platform

HybridUKContract
United Kingdom

Builds cloud-native back-end services and APIs in C#/.NET for a fintech platform transformation, collaborating with AWS and cross-functional teams to design scalable solutions.

Agile API AWS CDK Cloud +16 skills
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Dayshape
2 weeks ago

Software Engineer Placement (9-months)

Open 16d UKFull-time
United Kingdom

Build and enhance an AI-powered resource-management platform using JavaScript, C#, .NET, Vue.js, and Azure; work on scalable features and internal tooling in a fast-growing Edinburgh-based team.

AI Angular Azure C# CSS +8 skills
34 226 – 34 226 £
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Illumina
2 weeks ago

Software Engineer 2

UKFull-time H-1B sponsor history — This employer has had H-1B petitions approved by USCIS in the last five fiscal years, per the USCIS H-1B Employer Data Hub. The approval belongs to the employer and is not a commitment to sponsor this role.
United Kingdom

The Software Engineer 2 will develop and maintain cloud-based applications for genomic healthcare solutions, working in an agile team to support oncology and prenatal testing products. The role requires proficiency in Java and object-oriented design, with a focus on building scalable, reliable software within a multidisciplinary environment.

Agile AI Angular AWS Bioinformatics +13 skills
48 100 – 72 100 £
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Addition
2 weeks ago

Software Engineer

HybridUK
United Kingdom

Build secure Android apps in Kotlin with Jetpack Compose and backend services in Rust/Python/Go, deployed via Docker and CI/CD, for UK Defence and National Security systems.

Android API CI/CD Containerization DevOps +11 skills
up to 70 000 £
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Yoh, A Day & Zimmermann Company
2 weeks ago

Rust Software Engineer

UK
United Kingdom

Develops high-integrity, safety-critical software (e.g., for aerospace, medical devices, satellites) using Rust, contributing to requirements, development, testing, and compliance activities in a regulated environment.

Embedded Software Rust
65 000 – 65 000 £
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