4,704 Backend Engineer 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

Overview

GSK is a science-led global healthcare company with a special purpose: to help people do more, feel better, live longer. We are on an audacious journey to impact the health of 2.5 billion people over the next decade. Our R&D division is at the forefront of this mission, dedicated to the discovery and development of groundbreaking vaccines and medicines. We are transforming the landscape of medical research by integrating cutting-edge science and technology and harnessing the power of genetics and new data. By fostering a collaborative environment that unites the talents of our people, we are revolutionizing R&D to pre-empt and defeat diseases. Join us in our commitment to uniting science, technology, and talent to get ahead of disease together.

Role/Project Overview

At GSK we see a world in which advanced applications of Machine Learning and AI will allow us to develop novel therapies to existing diseases and to quickly respond to emerging or changing diseases with personalized drugs, driving better outcomes at reduced cost with fewer side effects. It is an ambitious vision that will require the development of products and solutions at the cutting edge of Machine Learning and AI, as well as extensive safety and robustness evaluations. We’re looking for a highly skilled full stack engineer to help us make this vision a reality.

Competitive candidates will have a track record of writing and shipping quality, well-documented and well-tested software in the AI/ML industry. We are looking for candidates with experience in the field of Responsible AI, preferably for generative AI or language applications. In addition to ML engineering and data science skills, ideal candidates will demonstrate a keen interest in ethical and safety aspects of using AI in drug discovery and the clinic.

The Responsible AI team is built on the principles of ownership, accountability, continuous development, and collaboration. This fixed-term position is a unique opportunity to contribute to the development and evaluation of generative AI for drug discovery in a fast-paced environment, with a focus on impact and in collaboration with a large team. Our leaders will be committed to your career and development from day one.

 Key Responsibilities

• Backend development of generative AI evaluations for a Python web application.
• Integration of AI/ML components with frontend, backend, data and compute infrastructure.
• Responsible for high quality software implementations according to best practices, including automated test suites and documentation.
• Participate in code reviews, continuously improving personal standards as well as the wider team and product.
• Liaise with other technical staff and data engineers in the team and across allied teams, to build an end-to-end pipeline consuming other data products.
• Deliver ML- and data-driven insights on GenAI datasets.

Minimum Qualifications

• A degree in a quantitative or engineering discipline (e.g., computer science, computational biology, bioinformatics, engineering, among others); OR equivalent work experience as a professional ML engineer or data scientist.
• Strong skills in Python, with experience in backend development and unit testing.
• Knowledge of generative AI, specifically Large Language Models.
• Knowledge of agile practices and able to perform in agile software development environments.
• Strong knowledge of modern software development tools / ways of working (e.g. git/GitHub, DevOps tools for deployment) – should be able to show practice of commit early and deploy often.

Preferred Qualifications

• Experience with safety and/or robustness evaluations of generative AI, e.g. defining guardrails, red teaming or persona-based evaluations.
• Knowledge of AI/ML approaches and deployment of AI/ML powered applications – especially using language models or NLP and agent-based approaches (e.g. LangGraph, PydanticAI, AutoGen),
• Knowledge of AI/ML evaluation and benchmarking approaches, experience with iterative improvement of AI/ML models and products.
• Research experience (e.g., Master’s project, internship at research organization).
• Cloud experience (e.g. Google Cloud and cloud run preferred) including core web application infrastructure.

Why GSK?

Uniting science, technology and talent to get ahead of disease together.

GSK is a global biopharma company with a special purpose – to unite science, technology and talent to get ahead of disease together – so we can positively impact the health of billions of people and deliver stronger, more sustainable shareholder returns – as an organisation where people can thrive. We prevent and treat disease with vaccines, specialty and general medicines. We focus on the science of the immune system and the use of new platform and data technologies, investing in four core therapeutic areas (infectious diseases, HIV, respiratory/ immunology and oncology).

Our success absolutely depends on our people. While getting ahead of disease together is about our ambition for patients and shareholders, it’s also about making GSK a place where people can thrive. We want GSK to be a place where people feel inspired, encouraged and challenged to be the best they can be. A place where they can be themselves – feeling welcome, valued, and included. Where they can keep growing and look after their wellbeing. So, if you share our ambition, join us at this exciting moment in our journey to get Ahead Together.

Inclusion at GSK

GSK is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive equal consideration for employment without regard to race, color, national origin, religion, sex, pregnancy, marital status, sexual orientation, gender identity/expression, age, disability, genetic information, military service, covered/protected veteran status or any other federal, state or local protected class.

If you need any adjustments in the recruitment process, please get in touch with our Recruitment team ( ) to further discuss this today.

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