811 Backend Staff jobs in the United Kingdom

Salary : £40,000 - £0,000

Location : We’re looking for someone based in the UK to help us better support our clients and collaborate closely with our wider team. This is a remote role, so you can work from wherever you feel most comfortable.

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At Substrakt, a UK based company with Global impact, we help arts and cultural organisations create exceptional digital experiences and we’re looking for a Backend Engineer to help us do just that.

As part of our Engineering team, you'll build robust, high-quality backend solutions that power our clients’ websites and digital products. From new website builds and custom integrations to performance optimisations and security enhancements, you’ll play a vital role in delivering outstanding products and services.

Substrakt is an equal opportunities employer. We believe that diversity of thought and experience makes us stronger, and we actively encourage applications from people of all backgrounds, identities, and abilities. Read more about our approach to inclusive recruitment .

Requirements

• Create exceptional backend solutions: Work on a range of projects across our client base including new builds, updates to existing websites, API integrations, infrastructure configurations, and other server-side tasks. You’ll work with modern technologies such as PHP, WordPress, MySQL, SQL, Python, Wagtail, Heroku and AWS (S3, CloudFront, RDS) - always with performance, security, and scalability in mind.
• Ensure quality and performance: Write clean, efficient, and secure code following best practices. You’ll test thoroughly, debug issues, and optimise performance to ensure reliable and seamless user experiences. You’ll also contribute to code reviews and help maintain our high technical standards.
• Collaborate and contribute: Work closely with frontend engineers, designers, and client-facing roles to ensure smooth delivery. You’ll communicate directly with clients when needed to explain technical decisions, and support Producers and Support & Solutions Managers in scoping and technical planning.
• Own your work: Take responsibility for the technical quality of your solutions, contribute to internal best practices, and help shape the future of our backend engineering processes. You’ll participate in solution reviews, submit and conduct code reviews, maintain technical documentation, and support continuous improvement.

• Strong experience in backend development using modern frameworks and tools (e.g., PHP, Python, WordPress, Wagtail, Django)
• Familiarity with relational databases (MySQL) and cloud infrastructure (Heroku, AWS, Cloudflare)
• Understanding of performance optimisation, secure coding practices, and scalable system design
• Enthusiasm for working collaboratively within a multidisciplinary team
• A friendly and helpful approach to communicating directly with clients
• Initiative, problem-solving mindset, and a drive to deliver high-quality work
• Openness to learn, share knowledge, and support others

Benefits

We’re a purpose-driven team, who are B-corp accredited, that values creativity, openness, and continual improvement. We believe in creating work we’re proud of and supporting each other to grow along the way. You’ll have the chance to work with some of the most inspiring arts and cultural organisations, contributing to meaningful projects that make a real impact.

• We operate a flexible, hybrid working model that supports autonomy and work-life balance.
• We have enhanced time off policies too with a focus on parents and carers, vacation days (you’ll get 25 days, plus bank holidays and you’ll never work a birthday again - because we give you that off)
• We offer NHS cashback scheme to support healthcare costs and a monthly wellbeing allowance of £50 to spend on whatever mak you feel good (whether that be a gym membership, a meal out, or a treatment of some kind)
• Everyone gets 6 days per year to focus on their own professional development, and a 00 budget to go along with that too.
• We invest heavily in communication and connection through weekly mailers, an intentional meeting cadence and internal awards. We also organise and cover the cost of bi-annual team gatherings to museums, art galleries and theatres.
• Not all benefits come in the form of traditional ‘perks’. At Substrakt, we place a strong emphasis on building the right team structure and workflows, so everyone knows what they’re accountable for and can focus on doing their best work.
• All team members have the opportunity to participate in our steering groups which aren’t just ‘nice to haves’ - they help everyone stay curious and influence the way Substrakt approaches things like Equality, Diversity and Inclusion, Internal Culture, Accessibility, AI, and Sustainability

If this sounds like you, and you like the sound of us, we’d love to hear from you.

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

Backend Polyglot Integration Developer – Modern PHP, OOP, APIs, Cloud

Hybrid: Two days in our client's Duxford office and three days working from home.

On Monday morning, you might be refining an API connection between a collections database and a public-facing platform. By Wednesday, you could be writing code PHP 8.2 or Python 3.1x to automate image processing for a new exhibition launch. Friday afternoon? Testing out an AI tool to help curators search archive materials faster.

That’s the reality of life as a Backend Polyglot Integration Developer here. No two weeks look the same. The mix of backend software development, systems integration, and cloud infrastructure work means you’ll constantly be learning, solving problems, and collaborating with colleagues from across the organisation.

This is a fantastic opportunity for a technically adaptable polyglot developer to join a nationally respected cultural institution with an ambitious digital vision. You’ll work on varied and meaningful projects; from API-driven integrations to AI experimentation - helping to shape a modern, secure, and scalable technology environment. You’ll operate in a multi-platform environment: Windows is predominant, but production Linux systems are crucial to the role.

Backend Polyglot Integration Developer Key Skills – what we’re looking for:

You don’t need to have “Backend Integration Developer” on your CV to be a great fit. If you’ve worked in backend development, software engineering, or API management — and you’re confident developing in more than one modern OO programming languages e.g. PHP, Python etc. and Linux — we’d love to hear from you.

Essential:

* Strong skills in backend development and systems integration.

* Modern PHP (v8+) experience, ideally including PHP 8.2+ or above.

* Additional experience Programming in an additional OO programming language e.g. Python, Perl etc.

* Proficiency in Linux server environments, with Windows server familiarity.

* Experience developing and managing APIs.

* AI familiarity personal or professional.

* Familiarity with MySQL and at least one search platform such as Elasticsearch or SOLR.

* Knowledge of Git, version control, and CI/CD pipelines.

* Strong problem-solving skills and ability to work independently.

Useful to have:

* JavaScript (Node.js) for automation or backend logic.

* Experience with other OO programming languages.

* Familiarity with cloud platforms, especially Microsoft Azure.

* Containerisation tools such as Docker.

* Automation tools like Ansible.

* Interest in AI, machine learning, and related technologies.

Backend Polyglot Integration Developer - What you’ll be doing:

As a Backend Polyglot Integration Developer, you’ll work across backend systems, APIs, and digital platforms to deliver seamless integrations, improve performance, and support new digital capabilities. This is a hands-on, varied role where you’ll contribute ideas, explore new technologies, and make a visible impact.

* Develop, integrate, and maintain APIs across multiple platforms and services.

* Write and optimise backend code, with a focus on PHP and automation scripts.

* Support server infrastructure across Linux (production) and Windows (development and other services) environments.

* Improve deployment workflows, CI/CD pipelines, and automated testing.

* Contribute to AI-related projects and innovation initiatives.

* Enhance search functionality and digital content delivery.

* Collaborate with internal teams to deliver secure, high-performing solutions.

* Maintain clear technical documentation and troubleshooting guides.

Why join?

* Work on high-profile, mission-driven projects that reach millions.

* Be part of preserving and sharing a legacy that spans generations, using technology to connect people with history in new and meaningful ways.

* Exposure to a wide tech stack, from PHP and Python to AI and cloud tools.

* Hybrid working pattern with a collaborative, supportive team.

* Strong focus on professional development and learning.

Salary & Benefits:

* £50-60,000 (dependent on experience)

* 25 days annual leave (rising to 30 after 5 years) plus public holidays

* Exceptional pension contributions (16.7%–24.3%)

* Free access to partner museum exhibitions

* Enhanced parental benefits and family-friendly policies

* Cycle-to-work and season ticket loan schemes

* Healthcare membership options

Ready to bring your backend and integration skills to an organisation with purpose?

Apply now for a confidential conversation about this unique opportunity.

Please note: Shortlisted candidates will receive the official job description later in the process. It will carry a different job title to the one advertised, but the scope and responsibilities remain exactly as described here.

Backend Polyglot Integration Developer – Modern PHP, OOP, APIs, Cloud

Hybrid: Two days in our client's Manchester office and three days working from home.

On Monday morning, you might be refining an API connection between a collections database and a public-facing platform. By Wednesday, you could be writing code PHP 8.2 or Python 3.1x to automate image processing for a new exhibition launch. Friday afternoon? Testing out an AI tool to help curators search archive materials faster.

That’s the reality of life as a Backend Polyglot Integration Developer here. No two weeks look the same. The mix of backend software development, systems integration, and cloud infrastructure work means you’ll constantly be learning, solving problems, and collaborating with colleagues from across the organisation.

This is a fantastic opportunity for a technically adaptable polyglot developer to join a nationally respected cultural institution with an ambitious digital vision. You’ll work on varied and meaningful projects; from API-driven integrations to AI experimentation - helping to shape a modern, secure, and scalable technology environment. You’ll operate in a multi-platform environment: Windows is predominant, but production Linux systems are crucial to the role.

Backend Polyglot Integration Developer Key Skills – what we’re looking for

You don’t need to have “Backend Integration Developer” on your CV to be a great fit. If you’ve worked in backend development, software engineering, or API management — and you’re confident developing in more than one modern OO programming languages e.g. PHP, Python etc. and Linux — we’d love to hear from you.

Essential:

* Strong skills in backend development and systems integration.

* Modern PHP (v8+) experience, ideally including PHP 8.2+ or above.

* Additional experience Programming in an additional OO programming language e.g. Python, Perl etc.

* Proficiency in Linux server environments, with Windows server familiarity.

* Experience developing and managing APIs.

* AI familiarity personal or professional.

* Familiarity with MySQL and at least one search platform such as Elasticsearch or SOLR.

* Knowledge of Git, version control, and CI/CD pipelines.

* Strong problem-solving skills and ability to work independently.

Useful to have:

* JavaScript (Node.js) for automation or backend logic.

* Experience with other OO programming languages.

* Familiarity with cloud platforms, especially Microsoft Azure.

* Containerisation tools such as Docker.

* Automation tools like Ansible.

* Interest in AI, machine learning, and related technologies.

Backend Polyglot Developer - What you’ll be doing:

As a Backend Polyglot Integration Developer, you’ll work across backend systems, APIs, and digital platforms to deliver seamless integrations, improve performance, and support new digital capabilities. This is a hands-on, varied role where you’ll contribute ideas, explore new technologies, and make a visible impact.

* Develop, integrate, and maintain APIs across multiple platforms and services.

* Write and optimise backend code, with a focus on PHP and automation scripts.

* Support server infrastructure across Linux (production) and Windows (development and other services) environments.

* Improve deployment workflows, CI/CD pipelines, and automated testing.

* Contribute to AI-related projects and innovation initiatives.

* Enhance search functionality and digital content delivery.

* Collaborate with internal teams to deliver secure, high-performing solutions.

* Maintain clear technical documentation and troubleshooting guides.

Why join?

* Work on high-profile, mission-driven projects that reach millions.

* Be part of preserving and sharing a legacy that spans generations, using technology to connect people with history in new and meaningful ways.

* Exposure to a wide tech stack, from PHP and Python to AI and cloud tools.

* Hybrid working pattern with a collaborative, supportive team.

* Strong focus on professional development and learning.

Salary & Benefits:

* £50-60,000 (dependent on experience)

* 25 days annual leave (rising to 30 after 5 years) plus public holidays

* Exceptional pension contributions (16.7%–24.3%)

* Free access to partner museum exhibitions

* Enhanced parental benefits and family-friendly policies

* Cycle-to-work and season ticket loan schemes

* Healthcare membership options

Ready to bring your backend and integration skills to an organisation with purpose?

Apply now for a confidential conversation about this unique opportunity.

Please note: Shortlisted candidates will receive the official job description later in the process. It will carry a different job title to the one advertised, but the scope and responsibilities remain exactly as described here.

Backend Polyglot Integration Developer – Modern PHP, APIs, Cloud

Hybrid: Two days in our client's London office and three days working from home.

On Monday morning, you might be refining an API connection between a collections database and a public-facing platform. By Wednesday, you could be writing code PHP 8.2 or Python 3.1x to automate image processing for a new exhibition launch. Friday afternoon? Testing out an AI tool to help curators search archive materials faster.

That’s the reality of life as a Backend Polyglot Integration Developer here. No two weeks look the same. The mix of backend software development, systems integration, and cloud infrastructure work means you’ll constantly be learning, solving problems, and collaborating with colleagues from across the organisation.

This is a fantastic opportunity for a technically adaptable polyglot developer to join a nationally respected cultural institution with an ambitious digital vision. You’ll work on varied and meaningful projects; from API-driven integrations to AI experimentation - helping to shape a modern, secure, and scalable technology environment. You’ll operate in a multi-platform environment: Windows is predominant, but production Linux systems are crucial to the role.

Backend Polyglot Integration Developer Key Skills – what we’re looking for:

You don’t need to have “Backend Integration Developer” on your CV to be a great fit. If you’ve worked in backend development, software engineering, or API management — and you’re confident developing in more than one modern OO programming languages e.g. PHP, Python etc. and Linux — we’d love to hear from you.

Essential:

* Strong skills in backend development and systems integration.

* Modern PHP (v8+) experience, ideally including PHP 8.2+ or above.

* Additional experience Programming in an additional OO programming language e.g. Python, Perl etc.

* Proficiency in Linux server environments, with Windows server familiarity.

* Experience developing and managing APIs.

* Familiarity with MySQL and at least one search platform such as Elasticsearch or SOLR.

* Knowledge of Git, version control, and CI/CD pipelines.

* Strong problem-solving skills and ability to work independently.

Useful to have:

* JavaScript (Node.js) for automation or backend logic.

* Experience with other OO programming languages.

* Familiarity with cloud platforms, especially Microsoft Azure.

* Containerisation tools such as Docker.

* Automation tools like Ansible.

* Interest in AI, machine learning, and related technologies.

Backend Polyglot Integration Developer - What you’ll be doing:

As a Backend Polyglot Integration Developer, you’ll work across backend systems, APIs, and digital platforms to deliver seamless integrations, improve performance, and support new digital capabilities. This is a hands-on, varied role where you’ll contribute ideas, explore new technologies, and make a visible impact.

* Develop, integrate, and maintain APIs across multiple platforms and services.

* Write and optimise backend code, with a focus on PHP and automation scripts.

* Support server infrastructure across Linux (production) and Windows (development and other services) environments.

* Improve deployment workflows, CI/CD pipelines, and automated testing.

* Contribute to AI-related projects and innovation initiatives.

* Enhance search functionality and digital content delivery.

* Collaborate with internal teams to deliver secure, high-performing solutions.

* Maintain clear technical documentation and troubleshooting guides.

Why join?

* Work on high-profile, mission-driven projects that reach millions.

* Be part of preserving and sharing a legacy that spans generations, using technology to connect people with history in new and meaningful ways.

* Exposure to a wide tech stack, from PHP and Python to AI and cloud tools.

* Hybrid working pattern with a collaborative, supportive team.

* Strong focus on professional development and learning.

Salary & Benefits:

* £50-60,000 (dependent on experience)

* 25 days annual leave (rising to 30 after 5 years) plus public holidays

* Exceptional pension contributions (16.7%–24.3%)

* Free access to partner museum exhibitions

* Enhanced parental benefits and family-friendly policies

* Cycle-to-work and season ticket loan schemes

* Healthcare membership options

Ready to bring your backend and integration skills to an organisation with purpose?

Apply now for a confidential conversation about this unique opportunity.

Please note: Shortlisted candidates will receive the official job description later in the process. It will carry a different job title to the one advertised, but the scope and responsibilities remain exactly as described here.