1,101 Backend jobs in the United Kingdom

At SeedLegals, we're on a mission to make legal work a breeze for startups and small businesses worldwide. Our tech-driven approach has already helped over 50,000 founders across the UK, France and Ireland close funding rounds, hire employees, and grant share options to their teams, to name just a few.

We're seeking talented backend developers to join one of our three scrum teams. You'll play a pivotal role in shaping team growth and developing our code base. Working alongside five engineers, a UX designer, and a Product Manager, you'll have the autonomy to drive innovation in areas like social investment features, document and workflow management, and legal template generation. Teams are managed from within and report directly to the CTO, so you'll be working alongside with your manager to solve technical problems.

This is a unique opportunity to gain extensive knowledge of the startup world, VC fundraising, investor tax schemes, and more. As you work on complex projects, you'll also gain invaluable domain knowledge that will prepare you for entrepreneurship yourself.

We're an international team of 17 developers from 12 countries, with a hybrid working model that allows for flexibility and collaboration. While each team meets fortnightly at our offices in Holborn to whiteboard, plan, and socialise, you'll also have the freedom to work remotely.

Requirements

We’d love to hear from you if.

• You love solving challenging problems
• You love building high-performance APIs
• Have experience working with, and enjoy working with JVM languages (Java and Kotlin), and Spring
• You understand why TDD is important
• You own and take pride in contributing to all stages of development
  

And if you can hit one or two of these as well, even better.

• You have some personal projects on the go (maybe you write a blog, help with friends’ websites, contribute to open source projects etc.)
• Through your work, you have started looking more into the performance of web applications
• You believe in the Agile manifesto

Benefits

Why join SeedLegals:

You’ll join a friendly, motivated and multicultural team of founders, investors, developers and growth hackers. We’re based in Holborn, in the heart of the legal district of London.

• Share options: the option to buy shares in SeedLegals in the future, via our share option scheme
• Pension
• 25 days annual leave + bank holidays + your birthday off 
• 3 volunteer days per year: time off to support a charity or not-for-profit organisation you care about.
• Private healthcare
• Life insurance and critical illness cover
• Classpass: discounted access to studios, gyms, salons and spas near you
• Cycle-to-work scheme
• Weekly allowance for a free lunch in the office once a week
• £250 WFH allowance to set up or enhance your home workstation
• Annual learning budget for training courses, conferences and books
• Conference and Meetup opportunities

Our Interview Process:

• 1) ~40min initial conversation (video call)
• 2) A ~1hr technical interview. Here, we'll ask you to work through designing a solution to a real world technical challenge we've faced, as well as some questions about your experience with backend code in production environments.

Our Values

• We invest and trust in each other
• We’re committed to a growth mindset
• We embrace diversity and cultivate inclusion
• We’re driven by customer success

We are BOB, a hybrid L2 to build and launch Bitcoin applications. Our mission is accelerating the world’s transition to a fair and transparent financial system through Bitcoin as a credibly neutral, global settlement asset. We believe in a world with access to finance for everyone, everywhere, in a secure and usable manner.

We are seeking an experienced Backend Engineer to implement Node.js and Rust APIs, extending SQL databases, and writing GraphQL endpoints for external and internal tools. Your job is to implement REST APIs for projects integrating with the BOB Fusion campaign (a points campaign) and other APIs as well as GraphQL endpoints for BOB in the future. You will further maintain the Postgres database to extend and optimize the campaign. You will collaborate with internal teams to create tools that allow us to analyze the data on the BOB L2 internally. You work closely with our BD and product teams to ensure that projects interacting with BOB are successful.

• Architect and build APIs in Node.js and/or Rust for external partners.
• Extend and optimize the internal Postgres database for the BOB Fusion campaign.
• Build subquery and data-pipelines using Goldsky.
• Build internal tools that allow the BOB team to analyze on-chain data using off-chain data.
• Engage in discussions with the core team on partner requirements and feature roadmap.

Requirements

• Five years or more of building scalable, secure, and efficient APIs in Node.js or Rust.
• Five years or more of maintaining and building SQL databases.
• Two or more years of experience creating GraphQL endpoints.
• A deep interest or experience with Ethereum, EVM, subgraphs, and web3.
• Ability to work self-sufficiently, be proactive, and contribute ideas to solve problems.
• Great communication skills in a remote setting.

• Experience with Bitcoin
• Contributions to open-source projects
• Experience with Docker, Kubernetes and similar technologies
• Familiarity with Swagger / OpenAPI

Benefits

• Research-oriented team
• Solve novel problems
• Stock options
• Remote working
• 30-day vacation
• Allowance for a co-working space
• Yearly retreat

One of the UKs most iconic omni-channel retailers is looking for a BackEnd Software Engineer to join their expanding digital engineering function. This position requires deep expertise in Kotlin or modern Java , strong architectural understanding of microservices , and a passion for technical leadership and mentoring. Experience working within ecommerce, mobile, or customer-facing digital platforms .

WHJS1_UKTJ

Senior Backend Developer – Elixir / Ruby / Go
Location: Remote (One day a month in Chester)

Fancy joining a high-growth tech business with a major product roadmap and big investment into engineering?

We’re helping a client find a Senior Backend Developer to play a key role in scaling an established IoT platform – already used by thousands of businesses across the UK and Europe. The product is gaining serious traction, and there’s plenty of opportunity to lead, influence architecture, and shape the future of the platform.

You'll balance technical excellence with execution – working closely with Product, QA, and DevOps to keep things moving fast without compromising on quality or scalability.

If you enjoy solving complex problems, guiding high-performing teams, and building systems that actually make a difference – this one’s worth a look.

• Designing, building, and maintaining secure, scalable backend systems using Elixir and Ruby , with some Go in the mix

• Taking the technical lead on key projects, supporting delivery while influencing the wider architecture

• Guiding and mentoring junior engineers while setting the tone for engineering standards and delivery mindset

• Working closely within a cross-functional agile team – collaborating to solve real-world problems at pace

• Rolling up your sleeves when it counts – especially during high-pressure delivery periods

• Significant experience as a backend engineer in modern product environments

• Strong critical thinking skills and a pragmatic approach to problem solving

• Ability to lead from the front – both technically and as a mentor

• A product-led mindset – comfortable taking ownership from design to delivery

• Passion for agile principles, team collaboration, and iterative improvement

• Remote-first working (UK based), with just one day a month in Chester

• A major product with scale, complexity, and a real-world impact

• A fast-growing tech business with loads of opportunity to progress

• A great engineering culture with strong collaboration and high standards

• Competitive salary, bonus potential, and a solid benefits package

If you are interested then please submit your CV and we will be in contact asap! 

Job Title: Senior Backend Developer

Location: Liverpool City Centre, Hybrid working available

Salary: Up to 75,000 per annum depending on experience

Job Type: Permanent, Full Time

Hours: 37.5 hours per week, Monday to Friday, 9am to 5:30pm

The Acorn Group are looking for a highly skilled, experienced Backend developer to join our team. We are looking for a developer that has experience developing scalable applications using the latest .Net Technologies. You will have the chance to work on complex projects involving large datasets, message bus architectures, and streaming large sets of data.

What you'll be doing:

• Application Development: Design, develop, and maintain robust applications using NET 8 and C#.
• Implement and manage microservices architecture for scalable and efficient system design.
• Build out internal reusable libraries to be consumed by our team's ensuring consistency, reliability and maintainability.
• Utilising MediatR and MassTransit frameworks for inter-service communication.
• You will be working extensively with RabbitMQ for message queuing and handling.
• You will handle large datasets using MongoDB, Azure Cosmos DB, MySQL, and MS SQL Server.
• You will Work closely with cross-functional teams to define backend requirements, design scalable solutions, and implement new features. Ensure seamless integration with upstream services.
• Identify bottlenecks and bugs, and devise solutions to mitigate and address these issues.

What we're looking for:

• Minimum of 5 years of professional experience in .NET development.
• Proficient in .NET 8 and C# programming.
• Strong experience with microservice architecture.
• Familiarity with MediatR and MassTransit frameworks.
• Extensive experience with RabbitMQ and message bus architectures.
• Proficient in Azure Cosmos DB, MySQL, and MS SQL Server.
• Experience with Redis for caching mechanisms.
• Strong understanding of handling large datasets and data streaming.
• Strong communication and teamwork abilities.
• Ability to work in an Agile/Scrum environment.

About Acorn Insurance:

With over 40 years of experience, Acorn Insurance is a specialist provider dedicated to helping individuals secure motor insurance across the UK. We proudly serve more than 50,000 customers, ensuring they find policies that meet their needs and provide the peace of mind that comes with high-quality cover.

At Acorn Insurance, we offer comprehensive training and continuous in-house coaching. You'll receive in-depth, FCA-regulated industry knowledge and all the tools necessary to grow your career with us.

We celebrate diversity and are committed to fostering a culture where everyone feels respected and valued. As a Disability Confident Level 1 and Level 2 employer, we ensure our workplace is accessible and inclusive, encouraging our people to bring their best selves to work every day.

The Acorn Group has been recognised as a Great Place to Work for 2024/5. A record number of employees participated in our survey, overwhelmingly highlighting our welcoming and supportive atmosphere as an excellent place to build a career. We are committed to continuous improvement and have ambitious plans for 2025.

Why Acorn Insurance?

Acorn Insurance want to give you more than a job, we want to give you a purpose and a career.

So, what can we offer you as an employer? Some of the "your tomorrow" benefits you will receive include:

Wellbeing:

• Enhanced Annual Leave entitlement starting at 31 days and potentially increasing to 35 days per year depending on grade & length of service (including bank holidays)
• Enhanced paternity pay and 16 weeks full maternity pay.
• Colleague Assistance programme offers a suite of wellbeing services such as:
• 6 Free Counselling sessions per year
• Unlimited access to a telephone councillor 24/7
• Access to a free 4-week programme of cognitive behavioural therapy (CBT) with a trained therapist mentor.
• Network of internal qualified mental health first aiders are available to provide support to colleagues.

Financial:

• A core level of life assurance with the option to increase cover via salary sacrifice and add your spouse/partner
• Ability to access your earnings before payday via Dayforce Wallet.
• Company pension scheme
• Refer a friend scheme with a 250 bonus for every colleague recommended on passing their probation period.
• Access to a flexible benefits platform including an annual flex pot allowance to spend on over 15 benefits of your choice.
• Ability to give back. You can opt into donating money to charity to climate positive organisations directly from your salary.

Please visit our website to view more of our excellent work benefits!

All roles are subject to DBS and Financial checks, any offer made will be conditional until checks are completed to a satisfactory standard.

Please click the ' APPLY' button to submit your CV for this role.

Candidates with experience or relevant job titles of; Software Developer, Senior System Developer, Software Engineer, Systems Developer, Software Tester, Backend Services, API's, API, Application Programming Interface may also be considered for this role.