2,254 Senior Ruby Developer jobs in the United Kingdom

Ruby on Rails Developer
Job Description:
We're looking for a Ruby on Rails Developer to build, enhance, and maintain scalable software systems that align with Sage's long-term business objectives. You'll work on meaningful products, solve complex technical challenges, and collaborate with cross-functional teams to deliver high-quality solutions. Experience with Ruby on Rails is essential; interest or experience in AI integration is a strong plus.
This is a hybrid role requiring 3 days per week in our Newcastle or Barcelona office.
Your First 90 Days
- 30 days - Get up to speed with our architecture, development tools, and team practices. Understand product goals and familiarise yourself with our codebase and deployment workflows.
- 60 days - Start contributing to core product development. Take ownership of well-defined features, write high-quality Ruby code, and collaborate with peers across engineering, product, and design.
- 90 days+ - Lead feature development from design to release. Drive improvements in performance and maintainability, mentor junior developers, and proactively suggest enhancements across the stack.
What You'll Do
- Build and maintain scalable software using Ruby on Rails
- Design and implement features, APIs, and integrations with modern technologies
- Collaborate with product owners, designers, and developers to deliver projects
- Participate in the full development lifecycle: design, development, testing, deployment
- Ensure clear documentation of code, logic, and technical decisions
- Continuously improve existing systems with a focus on performance and user value
- Mentor junior developers and contribute to a collaborative team culture
- Stay updated on relevant technologies, including AI and cloud tools
Meet the Team
You'll report to an Engineering Team Lead and work within a collaborative, cross-functional product team. You'll regularly interact with subject matter experts, designers, and other developers to build solutions aligned with business and user needs. The team promotes a supportive, agile working culture with a strong focus on technical excellence and mentorship.
How Success Will Be Measured
- Delivery of high-quality, scalable, and maintainable code
- Contribution to team goals and successful completion of sprint commitments
- Effective collaboration and communication across teams
- Proactive engagement in code reviews, documentation, and process improvement
- Mentorship and support of junior developers
- Continuous learning and application of new tools or technologies (e.g., AI, cloud)
Skills You'll Gain
- Deepened expertise in Ruby on Rails and modern backend architecture
- Experience working with cloud platforms like AWS
- Exposure to AI-related integration and emerging technologies
- Enhanced collaboration and leadership skills in a cross-functional agile environment
- Familiarity with frontend development (React) and monitoring tools (New Relic)
Key Responsibilities:
Snapshot of Your Day-to-Day
You'll write and review Ruby code, develop APIs, and solve technical problems that have real business impact. Expect to pair with team members, participate in stand-ups and sprint planning, and contribute to both new feature development and system optimisation.
Qualifications
- Solid hands-on experience with Ruby on Rails
- Strong understanding of software engineering principles and best practices
- Experience working in Agile environments (Scrum, XP)
- Proven ability to work autonomously and deliver results
- Strong collaboration and communication skills
Nice to Have
- Experience with JavaScript or React
- Familiarity with AWS or other cloud providers
- Exposure to monitoring tools like New Relic
- Interest or experience in AI integration
At Sage, we offer you an environment where you can grow professionally without compromising your personal well-being. Our benefits package is designed to provide stability, flexibility, and balance:
- Benefits video - Comprehensive health, dental and vision coverage
- Work away scheme for up to 10 weeks a year
- On-going training and professional development
- Paid 5 days yearly to volunteer through our Sage Foundation
- Flexible work patterns and hybrid working
#LI-AL2
Function:
Product Delivery
Country:
United Kingdom
Office Location:
Newcastle
Work Place type:
Hybrid
Advert
Working at Sage means you're supporting millions of small and medium sized businesses globally with technology to work faster and smarter. We leverage the future of AI, meaning business owners spend less time doing routine tasks, like entering invoices and generating reports, and more time pursuing their ambitions.
Our colleagues are the best of the best. It's why we were awarded 2024 Best Places to Work by Glassdoor. Because to achieve extraordinary outcomes, we need extraordinary teams. This means infusing Sage with people who knock down barriers, continuously innovate, and want to experience their potential.
Learn more about working at Sage:sage.com/en-gb/company/careers/working-at-sage/
Watch a video about our culture:youtube.com/watch?v=qIoiCpZH-QE
We celebrate individuality and welcome you to join us if you embrace all backgrounds, identities, beliefs, and ways of working. If you need support applying, reach out
Learn more about DEI at Sage:sage.com/en-gb/company/careers/diversity-equity-and-inclusion/
Equal Employment Opportunity (EEO)
Sage is committed to Equal Employment Opportunity and providing reasonable accommodations to applicants with physical and/or mental disabilities.
In order to provide equal employment and advancement opportunities to all individuals, employment decisions at Sage will be based on merit, qualifications, and abilities. Sage does not discriminate in employment opportunities or practices on the basis of race, color, religion, sex, national origin, age, protected disability, veteran status, sexual orientation, gender identity, genetic information, or any other characteristic protected by applicable law.

Why is home-buying painful?

When we buy any other commodity, we usually transact with one party. For example, a car is bought from just a car dealer, and you have to only deal with them.

Although home-buyers have to work with multiple parties — estate agents, mortgage brokers, solicitors, lenders and surveyors, contributing to it widely being accepted as one of the most stressful processes (following closely after divorce!).

A key contributor to this stress is that consumers have to interact with multiple softwares that each of these parties currently use — which are outdated, non-standardised and not interconnected.

Poor buyers, therefore, repeat the same processes with each stakeholder and glue everything together with email, phone, letters, WhatsApp and sometimes fax — adding to their pain…!

At Homey we are rebuilding the software landscape for consumers and businesses across the home-buying experience in a single cloud based platform to make it a beautiful and delightful experience.Here are some of our screens:

We are already profitable and work with 20 of the biggest estate agents/ law firms in UK.

We choose to be in semi-stealth mode as our customers currently come from referrals, and we don’t want incumbents learning from our ideas — the best way to learn about us, is to talk to us.

Where we need help?

• Agile development of iterative features based on the stories and designs prepared by Product and Design.

Tech stack

• Ruby
• Rails 7
• PostgreSQL
• Hotwire
• Tailwind
• RSpec
• Heroku

Why us?

• You will build a web app with a core impact on the 1500 consumers passing through the platform monthly.
• Working with a team of small closely knit A+ players. We believe in quality, not quantity.

Requirements

What we look for?

• 5+ years of experience as Ruby engineer.
• Experience working in a fast-paced development team with Ruby on Rails experience.
• Have a positive attitude that radiates to the team.
• Experience with other Javascript languages is desirable, although not required.
• Evidence of coding experience beyond working experiences, such as hackathons and personal projects, is desirable, although not required.

Benefits

What we offer?

We have budgeted a salary package range of £80-110k for this role.

• We ask you what you like as a salary and match this against your previous quality of work, and other applicants.
• We give you the flexibility to decide how much of your salary package to take as share options so that you can participate in the upside growth of the company’s value if you wish to.

Our mission and where you fit in

At Employment Hero, we’re an ambitious bunch on a mission to make employment easier and more valuable for everyone. 

Since our inception in 2014 we've had some pretty impressive growth (100% YoY), now serving 300,000 businesses globally, with 2 million+ users on the platform, reaching unicorn status in 2022 - and we have no plans to slow down. 

There’s never been a more exciting time to join one of the fastest-growing SaaS unicorns, so let’s see if we could be a match!

What your days might look like 

This role is with our HR, Benefits and Payroll Integration teams who build and run an all-in-one platform so our customers can manage everything from pay and annual leave to professional development and employee engagement.

Week to week you'll be:

• End-to-end fullstack development for new and current cloud-based applications
• Working across our Ruby codebase which are run in an AWS cloud environment using EC2 and Kubernetes
• Navigating different parts of a complex SAAS product - picking up new tools, technologies and subject domains quickly
• Work on the technology roadmap with Product Owners, designing solutions with your squad, and new feature development, through to production, improving/optimizing and maintenance
• Debug and perform root cause analysis for application issues
• Perform tests and quality checks on your code - you own the quality and security of the code you create
• Take initiative in recommending improvements to the development process
• Proactively identify application pain points and suggest mitigation strategies
• Perform peer reviews of code changes
• Maintain documentation and help articles for new/updated features
• Work closely with business stakeholders within an agile environment
  

What will you bring 

We're looking for someone who:

• Excellent experience with Ruby on Rails
• Knowledge of correct design patterns for code and how to transform existing code to implement them.
• Experience in developing software, using microservices or SOA architecture for deployment on public clouds - we use AWS
• Experience using Agile methodologies and working with Product teams
• Quality coding practices, including test-driven development, unit testing and secure coding awareness.

Experience is important, but for us the biggest measure of success is people who can live and breathe our values. Show us what you can bring to the table, and we’ll empower you to let your talents shine.

The EH Way

The EH Way is how we describe our culture at Employment Hero and how we all operate. It is our DNA. You can read all about it on our careers page:  

In short, you’ll love working with us if:

• Revolutionising employment gets your heart racing.
• You thrive on the flexibility (and responsibility) of a remote-first business.
• Our values align, and shape how you show up every day.
• You love the dynamic pace of a startup, are driven by innovation, and enjoy working with other smart people.

Plus, you’ll get to enjoy a number of great perks, including: 

• A generous budget for your home office.
• Cutting-edge tools and technology.
• Reward and recognition programs - because great work should be recognised and rewarded.
• Learning and development (including an external study policy, live monthly professional development classrooms, and premium online learning content).
• Employee Share Option Program: be an owner of Employment Hero.
• Annual Global Gathering - so far we’ve been to Thailand, Vietnam, Bali and are excited to meet in Dubai in 2025.

Are we a match? 

Think we're the right match for you? Fantastic! Click 'Apply' and our talent team will reach out with the next steps.

At Employment Hero, we are committed to safeguarding the privacy of your application data. To understand how we do so, you can read our Applicant Privacy Policy here:

Employment Hero celebrates diverse perspectives and experiences, we invite people of all backgrounds and identities to apply for this position.

This opportunity is only for candidates currently residing in the specified country. Your location may affect eligibility and rates.

At Mindrift , innovation meets opportunity. We believe in using the power of collective intelligence to ethically shape the future of AI.

What we do

The Mindrift platform connects specialists with AI projects from major tech innovators. Our mission is to unlock the potential of Generative AI by tapping into real-world expertise from across the globe.

About the Role

GenAI models are improving very quickly, and one of our goals is to make them capable of addressing specialized questions and achieving complex reasoning skills. If you join the platform as an AI Tutor in Coding, you’ll have the opportunity to collaborate on these projects.

Although every project is unique, you might typically:

• Code generation and code review
• Prompt evaluation and complex data annotation
• Training and evaluation of large language models
• Benchmarking and agent-based code execution in sandboxed environments
• Working across multiple programming languages (Python, JavaScript/TypeScript, Rust, SQL, etc.)
• Adapting guidelines for new domains and use cases
• Collaborating with project leads, solution engineers, and supply managers on complex or experimental projects

How to get started

Simply apply to this post, qualify, and get the chance to contribute to projects aligned with your skills, on your own schedule. From creating training prompts to refining model responses, you’ll help shape the future of AI while ensuring technology benefits everyone.

Requirements

• You have a Bachelor's in Software Development, Computer Science, or other related fields. 
• You have at least 3 years of professional experience with Ruby, hands-on experience with Ruby testing frameworks (RSpec, Minitest, Capybara) and automation tools
• Experience using, integrating, or tutoring others with AI/ML or LLM-powered testing/coding solutions in Ruby projects.
• Code review experience is a must.
• Hackathon or competitive coding experience is a plus.
• Your level of English is advanced (C1) or above .
• You are ready to learn new methods, able to switch between tasks and topics quickly and sometimes work with challenging, complex guidelines.
• Our freelance role is fully remote so, you just need a laptop, internet connection, time available and enthusiasm to take on a challenge.

Benefits

Why this freelance opportunity might be a great fit for you?

• Take part in a part-time, remote, freelance project that fits around your primary professional or academic commitments.
• Work on advanced AI projects and gain valuable experience that enhances your portfolio.
• Influence how future AI models understand and communicate in your field of expertise.

Web Development Team Lead
Location: London (Hybrid)
Salary: £50,000 - £55,000

Be the driving force behind the next generation of our property tech platform.

We’re looking for a hands-on technical leader who can balance writing code with leading a talented dev team . This isn’t about throwing everything away and starting fresh - it’s about smart evolution : scaling our platform, modernising where it matters, and keeping business needs front and centre.
You’ll own architecture decisions , speed up feature delivery, and take the weight off the CTO’s shoulders - all while helping your team level up.
 
What You’ll Do
Architect & Innovate

• Review our existing PHP + Vue architecture and decide what stays, what goes, and what moves to Node/Next
• Gradually introduce modular or microservice structures only when they add real value
• Work with the CTO on strategy while confidently making your own calls

Code & Deliver (≈50% of your time)

• Build and maintain in PHP/Vue for current services
• Develop new features in Node/Next
• Refactor, review, and maintain clean, consistent code

Lead & Develop People (≈50% of your time)

• Mentor mid-level and senior developers, run 1:1s, and map their growth paths
• Organise workflows, code reviews, and DevOps processes
• Balance urgent tasks with strategic priorities, keeping delivery smooth

Bridge Tech & Business

• Turn user pain points into smart, technical solutions
• Partner with product managers to prioritise high-impact features
• Release MVPs quickly, gather feedback, and iterate

Optimise DevOps

• Improve CI/CD pipelines and Docker usage
• Implement automated testing and service monitoring
• Make deployments fast, reliable, and drama-free

  
 You’ll Succeed If You Have…
Must-Haves

• 3–5+ years as a team lead, tech lead, or principal engineer
• Hands-on Node.js & major frontend framework experience (React/Vue)
• Proven ability to work with existing PHP codebases (Laravel/legacy)
• CI/CD, basic Docker, automated testing know-how
• Track record of building and developing teams (5–10 people)
• Strong English communication skills (Upper-Intermediate+)

Nice-to-Haves

• Kubernetes, Terraform, or advanced DevOps skills
• Experience leading monolith → microservices transitions
• Past CTO/startup founder perspective
• Wider tech stack knowledge for creative problem solving

  
Why This Role Is a Game-Changer

• Player-Coach Role – Half coding, half leading
• Impact From Day One – Every decision you make shapes the platform’s future
• Startup Agility – Move fast, avoid unnecessary bureaucracy
• Career Growth – Scale your leadership scope as the product scales

  
 Apply now for this Web Development Team Lead role and take charge of architecture, build a high-performing dev team, and lead a platform transformation that impacts thousands of users.
  
Please Note: Rayner Personnel – Property Recruitment  are acting as a recruitment agency with regards to this position. By submitting your application, you are consenting to Rayner Personnel  processing and storing your data for the purposes of your job search.
 
We receive a great many applications for our vacancies and try to respond to as many as we can as quickly as possible. If you have not heard from a member of the team within 48 working hours, please assume that on this occasion your application has not been successful, but please feel that you may apply for other roles we are advertising in the future.

Web Development Team Lead
Location: London (Hybrid)
Salary: £50,000 - £55,000

Be the driving force behind the next generation of our property tech platform.

We’re looking for a hands-on technical leader who can balance writing code with leading a talented dev team . This isn’t about throwing everything away and starting fresh - it’s about smart evolution : scaling our platform, modernising where it matters, and keeping business needs front and centre.
You’ll own architecture decisions , speed up feature delivery, and take the weight off the CTO’s shoulders - all while helping your team level up.
 
What You’ll Do
Architect & Innovate

• Review our existing PHP + Vue architecture and decide what stays, what goes, and what moves to Node/Next
• Gradually introduce modular or microservice structures only when they add real value
• Work with the CTO on strategy while confidently making your own calls

Code & Deliver (≈50% of your time)

• Build and maintain in PHP/Vue for current services
• Develop new features in Node/Next
• Refactor, review, and maintain clean, consistent code

Lead & Develop People (≈50% of your time)

• Mentor mid-level and senior developers, run 1:1s, and map their growth paths
• Organise workflows, code reviews, and DevOps processes
• Balance urgent tasks with strategic priorities, keeping delivery smooth

Bridge Tech & Business

• Turn user pain points into smart, technical solutions
• Partner with product managers to prioritise high-impact features
• Release MVPs quickly, gather feedback, and iterate

Optimise DevOps

• Improve CI/CD pipelines and Docker usage
• Implement automated testing and service monitoring
• Make deployments fast, reliable, and drama-free

  
 You’ll Succeed If You Have…
Must-Haves

• 3–5+ years as a team lead, tech lead, or principal engineer
• Hands-on Node.js & major frontend framework experience (React/Vue)
• Proven ability to work with existing PHP codebases (Laravel/legacy)
• CI/CD, basic Docker, automated testing know-how
• Track record of building and developing teams (5–10 people)
• Strong English communication skills (Upper-Intermediate+)

Nice-to-Haves

• Kubernetes, Terraform, or advanced DevOps skills
• Experience leading monolith → microservices transitions
• Past CTO/startup founder perspective
• Wider tech stack knowledge for creative problem solving

  
Why This Role Is a Game-Changer

• Player-Coach Role – Half coding, half leading
• Impact From Day One – Every decision you make shapes the platform’s future
• Startup Agility – Move fast, avoid unnecessary bureaucracy
• Career Growth – Scale your leadership scope as the product scales

  
 Apply now for this Web Development Team Lead role and take charge of architecture, build a high-performing dev team, and lead a platform transformation that impacts thousands of users.
  
Please Note: Rayner Personnel – Property Recruitment  are acting as a recruitment agency with regards to this position. By submitting your application, you are consenting to Rayner Personnel  processing and storing your data for the purposes of your job search.
 
We receive a great many applications for our vacancies and try to respond to as many as we can as quickly as possible. If you have not heard from a member of the team within 48 working hours, please assume that on this occasion your application has not been successful, but please feel that you may apply for other roles we are advertising in the future.

Our client, a cutting-edge tech company, is offering an exciting opportunity for a Junior Web Development Apprentice to join their team, working entirely remotely. This apprenticeship is designed for ambitious individuals eager to kickstart their career in web development and gain hands-on experience in a fast-paced, innovative environment. You will be learning and applying modern web technologies to build and maintain client-facing websites and internal applications. This role provides comprehensive training in front-end and back-end development, guided by experienced mentors.

Your responsibilities will include assisting senior developers in coding, testing, and debugging web applications. You will learn to create user-friendly interfaces using HTML, CSS, and JavaScript, and gain exposure to back-end languages and frameworks such as Python/Django or Node.js/Express. Familiarity with version control systems like Git and an understanding of database concepts (SQL/NoSQL) will be developed throughout the apprenticeship. You will participate in team meetings, learn about agile development methodologies, and contribute to project planning and execution. The ideal candidate is passionate about technology, possesses strong problem-solving abilities, and has a keen eye for detail. While prior professional experience is not required, a demonstrable interest in web development, such as personal projects or online courses, would be beneficial. This fully remote apprenticeship offers a structured learning path, leading to a recognized qualification and significant career progression opportunities within the tech industry. We are committed to providing a supportive and collaborative learning environment.

Embark on an exciting career in technology with this fully remote Junior Web Development Apprenticeship opportunity! Our client is looking for enthusiastic and motivated individuals eager to learn and grow within a supportive virtual environment. You will gain hands-on experience in front-end and back-end development, contributing to real-world projects. This is an unparalleled chance to build a strong foundation in software development while working from the comfort of your own home.

As a remote apprentice, your responsibilities will include:

• Assisting senior developers in coding, testing, and debugging web applications.
• Learning and applying various programming languages and frameworks such as HTML, CSS, JavaScript, Python, and React.
• Collaborating with team members through online communication tools (e.g., Slack, Microsoft Teams, Zoom).
• Participating in virtual code reviews and learning from experienced professionals.
• Contributing to the development of user interfaces and backend functionalities.
• Troubleshooting and resolving technical issues under guidance.
• Engaging in online learning modules and training sessions to enhance technical skills.
• Documenting code and project progress meticulously.

We are seeking candidates with a genuine passion for technology and a foundational understanding of computer science concepts. While prior coding experience is a plus, it is not strictly required as comprehensive training will be provided. A keen eye for detail, strong problem-solving abilities, and excellent communication skills are essential for success in this remote role. You must have a reliable internet connection and a suitable workspace to ensure productivity. This apprenticeship offers a pathway to a rewarding career in the digital landscape, providing valuable industry experience and qualifications.

Embark on a transformative career journey with our comprehensive Junior Web Development Apprenticeship program, designed to equip you with the cutting-edge skills demanded by today's digital landscape. This fully remote opportunity offers unparalleled flexibility, allowing you to learn and grow from the comfort of your own home, irrespective of your current location within the UK. Our client is a leading digital solutions provider, renowned for its innovative approach and commitment to nurturing talent from the ground up. As a participant in this apprenticeship, you will immerse yourself in the world of front-end and back-end development, gaining hands-on experience with a variety of programming languages and frameworks. Your responsibilities will encompass assisting senior developers in coding, testing, and debugging web applications, contributing to the design and implementation of new features, and collaborating with cross-functional teams in a virtual environment. You will be instrumental in translating client requirements into functional and aesthetically pleasing web experiences. This role demands a proactive attitude, a passion for learning, and a strong desire to contribute to collaborative projects. We are seeking individuals with a foundational understanding of computer science principles, a keen eye for detail, and excellent problem-solving abilities. While prior professional experience is not mandatory, a portfolio of personal projects or contributions to open-source initiatives will be highly advantageous. The program includes structured learning modules, mentorship from experienced professionals, and real-world project assignments that will build your portfolio and professional network. Upon successful completion of the apprenticeship, there is a strong potential for a permanent role within the company, offering continued professional development and career advancement opportunities. We value diversity and inclusion and encourage applications from all backgrounds. This is an exceptional chance to gain invaluable industry experience and launch a successful career in web development without the need for a traditional university degree. The position is based in **Leeds, West Yorkshire, UK**, but the work is conducted entirely remotely. Candidates must possess their own reliable internet connection and a suitable workspace conducive to focused work. You will be provided with necessary software licenses and access to cloud-based development environments. Join us and become a future architect of the digital world, shaping the future of web technology from your home office.