At a Glance
- Tasks: Join a dynamic team to develop and maintain scalable Ruby on Rails applications.
- Company: Innovative tech company focused on operational SaaS platforms.
- Benefits: Competitive salary, hybrid work model, and opportunities for professional growth.
- Other info: Collaborative culture with excellent career advancement opportunities.
- Why this job: Make an impact by solving complex backend challenges 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 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 dedicated to building robust operational SaaS platforms. Enjoy a hybrid work model that promotes work-life balance, alongside competitive salaries and opportunities for professional growth in a fast-paced environment focused on engineering excellence and reliability. With a strong emphasis on employee development and a culture that values teamwork and problem-solving, this role offers a meaningful chance to contribute to impactful projects while advancing your career.
StudySmarter Expert Advice🤫
We think this is how you could land Ruby on Rails Developer
✨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 personal project or contribute to open-source projects using Ruby on Rails. This not only sharpens your skills but also gives you something tangible to discuss during interviews.
✨Tip Number 3
Prepare for technical interviews by practicing coding challenges and system design questions. Use platforms like LeetCode or HackerRank to get comfortable with problem-solving under pressure.
✨Tip Number 4
Don’t forget to apply through our website! We’re always on the lookout for talented Ruby on Rails developers. Your next big opportunity could be just a click away!
We think you need these skills to ace Ruby on Rails Developer
Some tips for your application 🫡
Tailor Your CV:Make sure your CV is tailored to the Ruby on Rails Developer role. Highlight your experience with Ruby, Rails, and any relevant projects you've worked on. We want to see how your skills match what we're looking for!
Showcase Your Projects:Include links to any projects or contributions you've made, especially those that demonstrate your backend engineering skills. If you've worked on scalable systems or APIs, let us know! We love seeing real-world applications of your work.
Craft a Compelling Cover Letter:Your cover letter is your chance to shine! Share why you're excited about this role and how you can contribute to our team. Be sure to mention your problem-solving skills and your passion for backend challenges.
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’re considered for the role. Plus, it shows you’re keen to join our team at StudySmarter!
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.
✨Show Off 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 instances where you improved system reliability or optimised performance, especially with PostgreSQL or Redis. This will demonstrate your hands-on experience and ability to think critically under pressure.
✨Collaborate Like a Pro
This position requires close collaboration with various teams, so highlight your communication and teamwork skills. Prepare to discuss how you've worked with frontend, mobile, and product teams in previous roles. They’ll want to see that you can effectively contribute to a team environment and support ongoing platform growth.
✨Get Familiar with Their Tech Stack
Before the interview, take some time to familiarise yourself with their core technology stack, including AWS, Docker, and CI/CD processes. If you have experience with any of these technologies, be sure to mention it. Showing that you understand their tools and processes will give you an edge and demonstrate your enthusiasm for the role.
