202 Senior Backend Engineer jobs in the United Kingdom

Salary: £60,000 - £80,000

Why Midnite? 

Midnite is a next-generation betting platform that is built for today’s fandom. We are a collective of engineers and designers who all share a passion for building the best sportsbook & casino experience possible, allowing our fans to feel closer to the games they love through the rush of winning money. 

Unlike the alternatives, Midnite doesn't feel like a website built two decades ago. Instead, it's a cutting-edge creation, designed and constructed from the ground up with the latest technologies. Crafting an experience that's truly intuitive, immersive, and immediately understandable is no walk in the park, but we thrive on the challenge. We believe we're on the brink of creating something truly awesome.

What will you do?

We’re looking for a backend engineer who is eager to continue their development and grow under the guidance of more experienced mentors. In this role, you'll contribute to building APIs for our mobile and web applications, writing maintainable and efficient code while adhering to project timelines. You will also be impactful and comfortable shipping to production from week one.

Technical

Our tech stack is primarily implemented in Python and hosted on AWS, incorporating technologies such as Flask, Pytest, Mypy, Docker, PostgreSQL, SQS, S3 and Terraform, and we deploy daily. While familiarity with these technologies is preferred, it's not mandatory; what matters most to us is your commitment to maintaining high engineering standards and the desire for continuous improvement.

Collaboration & Leadership

You'll closely collaborate with a team of product, design, front-end development, and trading experts, thriving in a collaborative and supportive environment. Under the mentorship of senior engineers, you’ll have the opportunity to develop your skills and grow within the team.

Expectations

• 4+ years of professional coding experience in a dynamic or strongly typed language, with a strong preference for Python.
• Take ownership of projects and code, from initial design through to deployment and maintenance, ensuring high-quality deliverables.
• Contribute to the design, development, testing, and maintenance of software products, actively participating in all phases of the development lifecycle.
• Participate in code reviews, providing and receiving constructive feedback to maintain a high standard of code quality across the team.
• Stay curious and proactive in learning about industry trends, emerging technologies, and best practices to continuously enhance your skills and the team's capabilities.
• Collaborate with external partners and vendors to integrate their products into Midnite's systems, taking a lead role in managing these integrations with support from senior engineers when needed.

• Shape our future: Play a key role in our team's success, where your voice matters, and you'll have a direct impact on shaping Midnite's future.
• Connect and unwind: Take part in our quarterly gatherings where our community comes together to bond and have fun.
• Comprehensive health coverage: Look after your well-being with our outstanding zero-excess health insurance plan, which includes optical and dental coverage.
• Simplify life: Take advantage of our nursery salary sacrifice scheme, allowing you to conveniently pay your child's nursery fees straight from your paycheck.
• Work-life balance: Enjoy 25 paid holidays a year, plus generous paid maternity, paternity, and adoption leave, supporting you during life's most important moments.
• Productive home office: We provide everything you need for a comfortable and ergonomic home setup, ensuring you're as productive as possible.
• Flexible working: We embrace flexible working, allowing you to adjust your schedule when life's unexpected moments arise.
• Latest tech made easy: With our salary sacrifice schemes, you can upgrade to the latest gadgets, household items, and mobile tech without the upfront cost.
• Exclusive perks: Enjoy a wide range of discounts on retailers, groceries, and subscriptions, making life a little more affordable.
• Grow with us: Expand your skills through internal and external learning opportunities while benefiting from access to mentorship programs that support your development.
• Transparent compensation: We provide competitive pay with clear team bandings and salary grids, ensuring that salary discussions are simple and fair. 
• Constructive feedback: We foster a transparent culture, encouraging individual feedback and review sessions to help everyone improve.

At Midnite, we’re committed to creating equal opportunities for everyone. We actively strive to build balanced teams that reflect the diversity of our communities, including ethnic minorities, people with disabilities, the LGBTQIA+ community, and all genders.

We aim to provide an inclusive and supportive interview experience for all candidates. If you require any reasonable adjustments, please let us know in advance so we can ensure you feel comfortable and set up for success.

Salary : $90,00.00 - $10,000.00

Location: We’re looking for someone based in an Eastern Standard Time (EST) zone in Canada (specifically, Ontario, New Brunswick, Nova Scotia or Newfoundland) to help us better support our North American clients and work closely with our UK team. This is a remote role, so you can work from wherever you’re 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 public holidays and you’ll never work a birthday again - because we give you that off)
• We offer private healthcare and a monthly wellbeing allowance of $90 to spend on whatever makes 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 925 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 annual team gatherings in Ontario, and we’ll also fly you to the UK once a year to connect in person with the wider team (if you’re up for it)
• 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.

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

• Design, develop, and maintain scalable and high-performance backend services.
• Collaborate with cross-functional teams to define, design, and ship new features.
• Write clean, maintainable, and well-tested code.
• Optimize applications for maximum speed, scalability, and security.
• Troubleshoot and debug complex issues across the technology stack.
• Mentor and guide junior backend engineers.
• Participate in code reviews and contribute to a culture of technical excellence.
• Stay up-to-date with emerging backend technologies and best practices.

• Bachelor's or Master's degree in Computer Science, Engineering, or a related field, or equivalent practical experience.
• 5+ years of professional experience in backend development.
• Strong proficiency in at least one modern backend programming language (e.g., Python, Java, Go, Node.js).
• Experience with relational and NoSQL databases (e.g., PostgreSQL, MongoDB, Cassandra).
• Proven experience with cloud platforms like AWS, Azure, or GCP.
• Familiarity with containerization technologies such as Docker and Kubernetes.
• Excellent understanding of RESTful API design and development.
• Strong problem-solving and analytical skills.
• Excellent communication and collaboration skills, suitable for a remote working environment.

• Lead the design, development, and implementation of complex backend systems using modern programming languages and frameworks (e.g., Python, Node.js, Java, Go).
• Architect microservices, APIs, and data models that are scalable, reliable, and efficient.
• Mentor and guide a team of backend engineers, fostering a culture of collaboration and continuous improvement.
• Conduct code reviews, provide constructive feedback, and ensure adherence to coding standards and best practices.
• Collaborate with frontend developers, product managers, and other stakeholders to define project requirements and deliver high-quality software.
• Implement and manage CI/CD pipelines for automated testing and deployment.
• Optimize application performance, identify bottlenecks, and implement solutions.
• Ensure the security and integrity of data and systems.
• Stay up-to-date with emerging technologies and industry trends, advocating for their adoption where appropriate.
• Contribute to the overall technical strategy and roadmap of the engineering department.

• Bachelor's or Master's degree in Computer Science, Software Engineering, or a related discipline.
• 5+ years of professional experience in backend development, with a proven track record of leading projects.
• Expertise in one or more backend programming languages and associated frameworks.
• Strong understanding of database technologies (SQL, NoSQL), data modeling, and performance tuning.
• Experience with cloud platforms (AWS, Azure, GCP) and containerization technologies (Docker, Kubernetes).
• Proficiency in designing and building RESTful APIs and microservices.
• Solid understanding of software design patterns, data structures, and algorithms.
• Experience with Agile development methodologies.
• Excellent leadership, communication, and interpersonal skills.