At a Glance
- Tasks: Join a dynamic team to maintain and evolve backend systems for operational workflows.
- Company: Innovative tech company in London with a hybrid work model.
- Benefits: Competitive salary, flexible working, and opportunities for professional growth.
- Other info: Fast-paced environment with excellent collaboration across teams.
- Why this job: Tackle complex backend challenges and make a real impact on live production systems.
- 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
- 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)
Senior Ruby on Rails Backend Engineer — Hybrid London employer: Fynity
Join a dynamic technology business in London as a Senior Ruby on Rails Backend Engineer, where you'll be part of a collaborative and fast-paced environment focused on building scalable SaaS platforms. With a strong emphasis on employee growth, you will have the opportunity to tackle complex backend challenges while enjoying a hybrid work model that promotes work-life balance. The company fosters a culture of innovation and continuous improvement, ensuring that your contributions directly impact operational success and platform reliability.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Ruby on Rails Backend Engineer — Hybrid London
✨Tip Number 1
Network like a pro! Reach out to your connections in the tech industry, especially those who work with Ruby on Rails. Attend meetups or online events to meet potential employers and get your name out there.
✨Tip Number 2
Show off your skills! Create a GitHub profile showcasing your Ruby on Rails projects. This gives employers a chance to see your coding style and problem-solving abilities in action.
✨Tip Number 3
Prepare for interviews by brushing up on common backend challenges and solutions. Be ready to discuss your experience with PostgreSQL and AWS, as these are key areas for the role.
✨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 seeing candidates who take that extra step!
We think you need these skills to ace Senior Ruby on Rails Backend Engineer — Hybrid London
Some tips for your application 🫡
Tailor Your CV:Make sure your CV highlights your experience with Ruby on Rails and backend systems. We want to see how your skills align with the role, so don’t be shy about showcasing relevant projects or 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 engaging – we love a good story!
Showcase Your Problem-Solving Skills:In your application, mention specific challenges you've tackled in previous roles, especially those related to production systems. We’re all about solving complex problems, so let us know how you’ve done it!
Apply Through Our Website:We encourage you to apply directly through our website for the best chance of getting noticed. It’s super easy, and we can’t wait to see your application come through!
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 examples of complex problems you've solved in past roles. Think about how you approached these challenges, the tools you used, and the outcomes. This will demonstrate your strong debugging capabilities and your ability to work under pressure.
✨Familiarise Yourself with Their Tech Stack
Take some time to research the technologies mentioned in the job description, especially PostgreSQL, AWS, and Docker. If you have experience with these, be prepared to discuss it. If not, show your willingness to learn and adapt by mentioning any similar technologies you’ve worked with.
✨Emphasise Collaboration and Communication
This role requires close collaboration with various teams, so highlight your communication skills and teamwork experiences. Share examples of how you've successfully worked with product, frontend, or platform teams in the past. This will show that you’re not just a great engineer, but also a team player who values collaboration.
