At a Glance
- Tasks: Develop and maintain scalable Ruby on Rails applications for operational workflows.
- Company: Join a growing tech company focused on innovative SaaS solutions.
- Benefits: Competitive salary, hybrid work model, and opportunities for professional growth.
- Other info: Collaborative culture with excellent career advancement opportunities.
- Why this job: Tackle complex backend challenges and make a real impact in a fast-paced environment.
- Qualifications: Strong Ruby on Rails experience and a passion for backend engineering.
The predicted salary is between 65000 - 85000 € per year.
Location: London (Hybrid – 2 days per week onsite)
Salary: £65,000 to £85,000 (DOE)
The opportunity: We’re looking for a Mid / Senior Ruby Engineer to join a growing technology business building operational SaaS platforms used within large-scale, real-world environments. This role sits within a backend engineering team responsible for maintaining and evolving systems that support live operational workflows. You’ll work on modern Ruby on Rails applications that process high volumes of transactional activity, integrate with external systems, and support business-critical operational processes. The environment is fast-paced and product-focused, with a strong emphasis on reliability, scalability, and engineering quality. You’ll work closely with Product, Platform, and Engineering teams to improve backend systems, strengthen operational stability, and support ongoing platform growth. This is a hands-on engineering role with ownership across backend services, integrations, and production systems. It would suit someone who enjoys solving complex backend challenges, improving platform reliability, and working collaboratively across technical teams.
What you’ll be doing: As a Senior Ruby Engineer, you’ll help maintain and evolve backend systems that support operational workflows and live production environments. Key responsibilities include:
- Maintaining and improving Ruby on Rails applications supporting core operational processes
- Designing, building, and maintaining scalable backend services and APIs
- Writing clean, maintainable, and well-tested code
- Supporting platform reliability, scalability, and long-term maintainability
- Managing and improving integrations with third-party systems and APIs
- Optimising PostgreSQL database performance and background job processing
- Supporting AWS-based deployments and CI/CD processes alongside Platform teams
- Investigating, troubleshooting, and resolving production issues
- Improving monitoring, observability, and deployment confidence
- Collaborating closely with frontend, mobile, and product teams
- Contributing to backend architecture improvements and technical documentation
- Supporting continuous improvement across engineering standards and delivery practices
- Taking ownership of systems that directly support live operational environments
What we’re looking for: Essential experience:
- Strong commercial experience with Ruby on Rails within production environments
- Strong understanding of object-oriented programming and Rails architecture
- Experience building and maintaining scalable backend systems and APIs
- Strong PostgreSQL experience, including complex queries and performance optimisation
- Experience with Redis and Sidekiq for background job processing
- Experience working with REST APIs, JSON serialisation, and authentication methods such as JWT or SSO
- Experience working with AWS-based infrastructure
- Experience using Docker within development or production environments
- Experience troubleshooting and supporting live production systems
- Strong debugging and problem-solving capabilities
- Experience working within existing codebases and improving legacy functionality
- Strong communication and collaboration skills
- Experience working within Agile environments using Git/GitHub
Desirable / bonus experience:
- Experience working with SOAP/XML integrations
- Experience migrating serverless components into Rails applications
- Familiarity with Vue.js
- Experience supporting mobile applications or mobile-focused backend services
- Experience within regulated industries or operational B2B SaaS environments
- Experience improving CI/CD pipelines and deployment reliability
- Open-source contributions or technical blogging experience
About you:
- You enjoy solving complex backend engineering challenges
- You’re comfortable working across live production systems and operational platforms
- You care about reliability, scalability, and maintainability
- You take ownership and communicate proactively
- You enjoy collaborating across engineering, product, and platform teams
- You’re pragmatic, adaptable, and delivery-focused
- You thrive in fast-moving environments where engineering quality matters
Core technology stack:
- Ruby
- Ruby on Rails
- PostgreSQL
- Redis
- Sidekiq
- REST APIs
- AWS
- Docker
- Git / GitHub
- Vue.js (desirable)
Ruby on Rails Developer in London employer: Fynity
Join a dynamic technology business in London as a Mid-Senior Ruby on Rails Developer, where you'll be part of a collaborative and innovative team focused on building scalable SaaS platforms. Enjoy a hybrid work environment that promotes work-life balance, alongside competitive salaries and opportunities for professional growth in a fast-paced, product-driven culture that values engineering excellence and reliability.
StudySmarter Expert Advice🤫
We think this is how you could land Ruby on Rails Developer in London
✨Tip Number 1
Network like a pro! Reach out to your connections in the tech world, especially those who work with Ruby on Rails. A friendly chat can lead to insider info about job openings that aren’t even advertised yet.
✨Tip Number 2
Show off your skills! Create a GitHub profile showcasing your Ruby on Rails projects. Potential employers love seeing real examples of your work, so make sure it’s clean, well-documented, and highlights your problem-solving abilities.
✨Tip Number 3
Prepare for technical interviews by brushing up on your coding skills. Practice common Ruby on Rails problems and be ready to discuss your past projects. We all know that confidence is key, so get comfortable talking about your experience!
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we love hearing from passionate developers who are eager to join our team!
We think you need these skills to ace Ruby on Rails Developer in London
Some tips for your application 🫡
Tailor Your CV:Make sure your CV highlights your Ruby on Rails experience and any relevant projects you've worked on. We want to see how your skills align with the role, so don’t be shy about showcasing your achievements!
Craft a Compelling Cover Letter:Your cover letter is your chance to shine! Use it to explain why you’re passionate about backend engineering and how you can contribute to our team. Keep it concise but impactful – we love a good story!
Showcase Your Problem-Solving Skills:In your application, mention specific challenges you've faced in previous roles and how you tackled them. We’re looking for someone who enjoys solving complex problems, so let us know how you’ve done that in the past!
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you don’t miss out on any important updates. Plus, we love seeing applications come in through our own channels!
How to prepare for a job interview at Fynity
✨Know Your Ruby on Rails Inside Out
Make sure you brush up on your Ruby on Rails knowledge before the interview. Be prepared to discuss your experience with building and maintaining scalable backend systems, as well as your understanding of Rails architecture. They’ll likely ask you about specific projects you've worked on, so have some examples ready that showcase your skills.
✨Showcase Your Problem-Solving Skills
Since this role involves troubleshooting and resolving production issues, be ready to share how you've tackled complex backend challenges in the past. Think of specific scenarios where you improved system reliability or optimised performance, especially with PostgreSQL or Redis. This will demonstrate your hands-on experience and problem-solving capabilities.
✨Communicate Your Collaborative Spirit
This position requires close collaboration with various teams, so highlight your communication skills during the interview. Share examples of how you've worked with frontend, mobile, or product teams to improve backend systems. Showing that you can work well in a team will be key to making a good impression.
✨Prepare for Technical Questions
Expect technical questions related to AWS, Docker, and CI/CD processes. Brush up on your knowledge of these technologies and be ready to discuss how you've used them in previous roles. It’s also a good idea to review any relevant coding challenges or algorithms that may come up during the interview.
