4,704 Backend Engineer jobs in the United Kingdom

Backend Engineer –

Flatpeak

Posted today

Job Viewed

Tap Again To Close

Job Description

Location

: London, UK (Hybrid, 3 days/week)

Terms

: Permanent | £70K–95K + bonus, benefits & options

About us

:

Flatpeak connects to energy suppliers globally, streaming real-time electricity prices into devices and platforms for cost-optimised control. We've raised over $5M from top VCs in energy, fintech and AI — and we're just getting started.

Our stack

:

Node, Golang, MongoDB, Snowflake, AWS Serverless, Atlas, Fly, Graphana, Tableau

About you

:

  • 5+ years of experience as JavaScript, TypeScript and engineer
  • Good understanding of authentication mechanisms
  • Experience integrating with third-party APIs (REST & GraphQL)
  • Experience with data scraping and web scraping
  • Familiarity with serverless architectures
  • Experience or interest in Golang will be a plus

Our process:

  • Video call with Lead Engineer
  • Take-home test
  • In-person interview with Lead Engineer + CTO

Our benefits:

  • MacBook
  • Paid sick leave
  • Pension contribution
  • Annual salary review
  • Discounted gym membership
  • Eye care vouchers
  • Regular socials
  • Share options

We work from our Central London office (EC1) at least three days a week to stay sharp on collaboration, communication, and execution. If that suits you, we'd love to hear from you.

This advertiser has chosen not to accept applicants from your region.

Backend Engineer

London, London Alexander Chapman

Posted today

Job Viewed

Tap Again To Close

Job Description

We’re partnering with a rapidly growing seed stage startup that’s tackling one of the last major bottlenecks in innovation, helping industries like aerospace, healthcare, and energy move faster by modernizing how physical systems and devices are certified. Their platform makes it easier for companies with the highest standards to understand and meet complex certification requirements.


In just 3 months, they’ve generated six-figure revenue and closed a $4.5M seed round from top-tier investors behind Coinbase, Reddit, Klarna, and Spotify .


Now, they’re looking for exceptional Backend Engineers to join their founding team in London.


What You’ll Do

  • Ship from Day 1: Deploy to production your first day, take full ownership of what you build.
  • Build End-to-End: Design, spec, and deliver new features and services.
  • Solve Hard Problems: From scaling infrastructure to improving developer experience and talking to customers, you’ll do what it takes to move the product forward.


What They’re Looking For

  • 2+ years of hands-on engineering experience shipping production-grade code.
  • Strong background in backend or infrastructure engineering (Python, TypeScript, Go, or Rust).
  • Experience with APIs, distributed systems, databases (SQL/graph), containers, and cloud infra (AWS + Pulumi preferred).
  • Proven ability to own and deliver projects with intensity and speed, bonus if you’ve been an early startup member or founder.


Why Join

  • Compensation: £100k+ base salary + meaningful equity.
  • Impact: A once-in-a-generation chance to shape how humanity brings new ideas into the physical world.
  • Environment: In-person, high-energy team working 6 days a week in London (visa sponsorship and relocation covered).
  • Support: All tools, meals, and resources provided, so you can focus on building.
  • If you’re a problem-solver who thrives in high-intensity environments and wants to define the future of physical innovation, this is the opportunity.


Let's connect for other opportunities as well:

This advertiser has chosen not to accept applicants from your region.

Backend Engineer

Alexander Chapman

Posted today

Job Viewed

Tap Again To Close

Job Description

We’re partnering with a rapidly growing seed stage startup that’s tackling one of the last major bottlenecks in innovation, helping industries like aerospace, healthcare, and energy move faster by modernizing how physical systems and devices are certified. Their platform makes it easier for companies with the highest standards to understand and meet complex certification requirements.


In just 3 months, they’ve generated six-figure revenue and closed a $4.5M seed round from top-tier investors behind Coinbase, Reddit, Klarna, and Spotify .


Now, they’re looking for exceptional Backend Engineers to join their founding team in London.


What You’ll Do

  • Ship from Day 1: Deploy to production your first day, take full ownership of what you build.
  • Build End-to-End: Design, spec, and deliver new features and services.
  • Solve Hard Problems: From scaling infrastructure to improving developer experience and talking to customers, you’ll do what it takes to move the product forward.


What They’re Looking For

  • 2+ years of hands-on engineering experience shipping production-grade code.
  • Strong background in backend or infrastructure engineering (Python, TypeScript, Go, or Rust).
  • Experience with APIs, distributed systems, databases (SQL/graph), containers, and cloud infra (AWS + Pulumi preferred).
  • Proven ability to own and deliver projects with intensity and speed, bonus if you’ve been an early startup member or founder.


Why Join

  • Compensation: £100k+ base salary + meaningful equity.
  • Impact: A once-in-a-generation chance to shape how humanity brings new ideas into the physical world.
  • Environment: In-person, high-energy team working 6 days a week in London (visa sponsorship and relocation covered).
  • Support: All tools, meals, and resources provided, so you can focus on building.
  • If you’re a problem-solver who thrives in high-intensity environments and wants to define the future of physical innovation, this is the opportunity.


Let's connect for other opportunities as well:

This advertiser has chosen not to accept applicants from your region.

Backend Engineer

London, London algo1

Posted 6 days ago

Job Viewed

Tap Again To Close

Job Description

About Us:


We’re a VC-backed stealth-mode company building behavioural AI solutions for the retail industry. Our platform is designed from the ground up — no legacy, no patchwork systems — just a clean slate and a clear vision. Our mission is to bring the intelligence of modern machine learning directly to the in-store shopping experience.


Role:


We’re looking for an experienced Backend Engineer to work closely with product, design, mobile, and machine learning team members to design & build experiences that re-define in-store shopping. You'll help help build engaging & intuitive web experiences and the event-driven & real-time backend services that power them. You’ll work across the backend stack, real-time data flows and APIs on a backend designed for scale & flexibility.


Responsibilities:


  • Contribute to distributed, event-driven backend services connecting our web experience with information from remote devices and external data sources.
  • Build and document APIs (OpenAPI/AsyncAPI) for mobile and web clients
  • Model and manage structured and semi-structured data across storage layers
  • Integrate AI-driven personalisation and real-time insights into user flows
  • Contribute to overall system design: service boundaries, data ownership, scaling, and observability


Essential Qualifications:


  • Built modern full-stack applications w/ focus on backend (Python/Java/Go)
  • Worked with a variety of storage technologies (eg. Postgres, Mongo, Redis, Object)
  • Experience with async and bi-directional communication protocols and patterns (eg. WebSockets, SSE)
  • Designed and implemented event-driven distributed systems (eg. Kafka/Pulsar, RabbitMQ, MQTT, or similar)
  • Experience with container orchestration and service containerisation (Kubernetes, Docker)
  • Built and deployed services on any major cloud providers' services (Azure, GCP, AWS)
  • AI-Native development: use AI tools such as CoPilot or Cursor a collaborator and accelerator of development.


Nice to Have:

  • Experience in frontend development (eg. Javascript, Typescript, React.js)
  • Worked with real-time data collection and/or processing
  • Worked in an IoT or Edge-oriented architectures
  • Experience or knowledge in retail POS, inventory, or loyalty systems
This advertiser has chosen not to accept applicants from your region.

Backend Engineer

algo1

Posted 6 days ago

Job Viewed

Tap Again To Close

Job Description

About Us:


We’re a VC-backed stealth-mode company building behavioural AI solutions for the retail industry. Our platform is designed from the ground up — no legacy, no patchwork systems — just a clean slate and a clear vision. Our mission is to bring the intelligence of modern machine learning directly to the in-store shopping experience.


Role:


We’re looking for an experienced Backend Engineer to work closely with product, design, mobile, and machine learning team members to design & build experiences that re-define in-store shopping. You'll help help build engaging & intuitive web experiences and the event-driven & real-time backend services that power them. You’ll work across the backend stack, real-time data flows and APIs on a backend designed for scale & flexibility.


Responsibilities:


  • Contribute to distributed, event-driven backend services connecting our web experience with information from remote devices and external data sources.
  • Build and document APIs (OpenAPI/AsyncAPI) for mobile and web clients
  • Model and manage structured and semi-structured data across storage layers
  • Integrate AI-driven personalisation and real-time insights into user flows
  • Contribute to overall system design: service boundaries, data ownership, scaling, and observability


Essential Qualifications:


  • Built modern full-stack applications w/ focus on backend (Python/Java/Go)
  • Worked with a variety of storage technologies (eg. Postgres, Mongo, Redis, Object)
  • Experience with async and bi-directional communication protocols and patterns (eg. WebSockets, SSE)
  • Designed and implemented event-driven distributed systems (eg. Kafka/Pulsar, RabbitMQ, MQTT, or similar)
  • Experience with container orchestration and service containerisation (Kubernetes, Docker)
  • Built and deployed services on any major cloud providers' services (Azure, GCP, AWS)
  • AI-Native development: use AI tools such as CoPilot or Cursor a collaborator and accelerator of development.


Nice to Have:

  • Experience in frontend development (eg. Javascript, Typescript, React.js)
  • Worked with real-time data collection and/or processing
  • Worked in an IoT or Edge-oriented architectures
  • Experience or knowledge in retail POS, inventory, or loyalty systems
This advertiser has chosen not to accept applicants from your region.

Backend Engineer

London, London Blink - The Employee App

Posted 26 days ago

Job Viewed

Tap Again To Close

Job Description

Permanent

Blink is an employee app for frontline workers, with industry-leading engagement and a DAU of 99%. We’re dedicated to scaling our platform through precision, automation, and innovation. As part of a world-class engineering team, you’ll play a key role in shaping the future of how we support frontline workers.

This advertiser has chosen not to accept applicants from your region.

Backend Engineer

London, London Stakemate

Posted 27 days ago

Job Viewed

Tap Again To Close

Job Description

Permanent

This advertiser has chosen not to accept applicants from your region.
Be The First To Know

About the latest Backend engineer Jobs in United Kingdom !

Backend Engineer

£40000 - £65000 annum SeedLegals

Posted 479 days ago

Job Viewed

Tap Again To Close

Job Description

Permanent

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
This advertiser has chosen not to accept applicants from your region.

Backend Engineer

Distributed Crafts

Posted 497 days ago

Job Viewed

Tap Again To Close

Job Description

Permanent

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.

What you will do
  • 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.
Nice to have
  • 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
This advertiser has chosen not to accept applicants from your region.

Backend Software Engineer

London, London Allegis Global Solutions

Posted today

Job Viewed

Tap Again To Close

Job Description

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.



Important notice to employment businesses/agencies


GSK does not accept referrals from employment businesses and/or employment agencies in respect of the vacancies posted on this site. All employment businesses/agencies are required to contact GSK's commercial and general procurement/human resources department to obtain prior written authorization before referring any candidates to GSK. The obtaining of prior written authorization is a condition precedent to any agreement (verbal or written) between the employment business/ agency and GSK. In the absence of such written authorization being obtained any actions undertaken by the employment business/agency shall be deemed to have been performed without the consent or contractual agreement of GSK. GSK shall therefore not be liable for any fees arising from such actions or any fees arising from any referrals by employment businesses/agencies in respect of the vacancies posted on this site.

Please note that if you are aUS Licensed Healthcare Professional or Healthcare Professional as defined by the laws of the state issuing your license, GSK may be required to capture and report expenses GSK incurs, on your behalf, in the event you are afforded an interview for employment. This capture of applicable transfers of value is necessary to ensure GSK’s compliance to all federal and state US Transparency requirements. For more information, please visit GSK’s Transparency Reporting For the Record site.

This advertiser has chosen not to accept applicants from your region.
 

Nearby Locations

Other Jobs Near Me

Industry

  1. request_quote Accounting
  2. work Administrative
  3. eco Agriculture Forestry
  4. smart_toy AI & Emerging Technologies
  5. school Apprenticeships & Trainee
  6. apartment Architecture
  7. palette Arts & Entertainment
  8. directions_car Automotive
  9. flight_takeoff Aviation
  10. account_balance Banking & Finance
  11. local_florist Beauty & Wellness
  12. restaurant Catering
  13. volunteer_activism Charity & Voluntary
  14. science Chemical Engineering
  15. child_friendly Childcare
  16. foundation Civil Engineering
  17. clean_hands Cleaning & Sanitation
  18. diversity_3 Community & Social Care
  19. construction Construction
  20. brush Creative & Digital
  21. currency_bitcoin Crypto & Blockchain
  22. support_agent Customer Service & Helpdesk
  23. medical_services Dental
  24. medical_services Driving & Transport
  25. medical_services E Commerce & Social Media
  26. school Education & Teaching
  27. electrical_services Electrical Engineering
  28. bolt Energy
  29. local_mall Fmcg
  30. gavel Government & Non Profit
  31. emoji_events Graduate
  32. health_and_safety Healthcare
  33. beach_access Hospitality & Tourism
  34. groups Human Resources
  35. precision_manufacturing Industrial Engineering
  36. security Information Security
  37. handyman Installation & Maintenance
  38. policy Insurance
  39. code IT & Software
  40. gavel Legal
  41. sports_soccer Leisure & Sports
  42. inventory_2 Logistics & Warehousing
  43. supervisor_account Management
  44. supervisor_account Management Consultancy
  45. supervisor_account Manufacturing & Production
  46. campaign Marketing
  47. build Mechanical Engineering
  48. perm_media Media & PR
  49. local_hospital Medical
  50. local_hospital Military & Public Safety
  51. local_hospital Mining
  52. medical_services Nursing
  53. local_gas_station Oil & Gas
  54. biotech Pharmaceutical
  55. checklist_rtl Project Management
  56. shopping_bag Purchasing
  57. home_work Real Estate
  58. person_search Recruitment Consultancy
  59. store Retail
  60. point_of_sale Sales
  61. science Scientific Research & Development
  62. wifi Telecoms
  63. psychology Therapy
  64. pets Veterinary
View All Backend Engineer Jobs