At a Glance
- Tasks: Lead backend development and solve complex challenges in a dynamic SaaS environment.
- Company: Join a growing tech business with a collaborative and ownership-driven culture.
- Benefits: Competitive salary up to £100,000, hybrid work, and opportunities for professional growth.
- Other info: Fast-paced environment with a focus on scalability and continuous improvement.
- Why this job: Make a real impact by shaping backend architecture and mentoring fellow engineers.
- Qualifications: Strong Ruby on Rails experience and a passion for technical leadership.
The predicted salary is between 95000 - 105000 € per year.
Location: London (Hybrid – 2 days per week onsite)
Salary: Up to £100,000 (DOE)
The opportunity:
We’re looking for a Senior Ruby Engineer / Tech Lead to join a growing technology business building large-scale operational SaaS platforms used within complex, real-world environments. This is a hands-on senior engineering role with a clear pathway into broader technical leadership responsibilities. It would suit someone who enjoys solving complex backend challenges while also taking ownership of delivery, technical direction, and team support.
You’ll play a key role in scaling a modern Rails-based platform that supports high-volume transactional workflows, integrations with external systems, and mission-critical operational processes. Working closely with the Director of Engineering, you’ll help shape backend architecture, improve delivery processes, support customer onboarding initiatives, and act as a senior technical escalation point across the platform.
The business operates within a fast-paced product environment where reliability, scalability, and delivery quality are critical. The culture is collaborative, pragmatic, and ownership-driven, with a strong focus on autonomy, accountability, and continuous improvement.
What you’ll be doing:
As a Senior Ruby Engineer / Tech Lead, you’ll take ownership of backend delivery across key product areas while remaining heavily involved in hands-on engineering.
- Leading backend development across a large-scale Rails application
- Owning technical direction and contributing to architectural decisions
- Designing, building, and maintaining scalable backend services and APIs
- Supporting platform scalability, reliability, and maintainability
- Improving and refactoring existing backend functionality to reduce technical debt
- Optimising background job processing and asynchronous workflows
- Supporting integrations with external third-party systems and APIs
- Leading delivery planning, estimation, and technical scoping activities
- Acting as a senior escalation point for technical and delivery-related challenges
- Collaborating closely with product, engineering, and stakeholder teams
- Supporting sprint planning, Agile ceremonies, and delivery processes
- Mentoring and supporting engineers through technical guidance and collaboration
- Helping improve engineering standards, processes, and team effectiveness
What we’re looking for:
Essential experience:
- Strong commercial experience with Ruby on Rails within production environments
- Experience building and maintaining scalable backend systems and APIs
- Strong understanding of Rails monolith architecture
- Experience with PostgreSQL, Redis, and Sidekiq
- Experience working with AWS-based infrastructure
- Experience using Docker within development or production environments
- Strong debugging and problem-solving capabilities
- Excellent communication and stakeholder management skills
- Ability to explain technical concepts clearly to both technical and non-technical audiences
- Strong ownership mentality with a pragmatic engineering approach
Desirable / bonus experience:
- Experience leading Agile ceremonies or delivery processes
- Experience scoping technical work and contributing to estimation activities
- Experience working with Kubernetes-based deployments
- Experience integrating third-party platforms and APIs
- Experience within B2B SaaS or operational platform environments
- Experience supporting live production systems at scale
- Experience mentoring or supporting engineers within a team environment
About you:
- You’re a hands-on engineer who enjoys solving complex technical problems
- You’re comfortable balancing technical leadership with day-to-day delivery
- You enjoy mentoring and supporting other developers
- You care about scalability, maintainability, and engineering quality
- You communicate clearly and collaborate well across technical and non-technical teams
- You’re proactive, adaptable, and comfortable taking ownership
- You thrive in fast-moving environments where technology has real operational impact
Core technology stack:
- Ruby
- Ruby on Rails
- PostgreSQL
- Redis
- Sidekiq
- REST APIs
- AWS
- Docker
- Kubernetes
- Jira
- Slack
Senior Ruby On Rails Engineer employer: Fynity
Join a dynamic technology business in London as a Senior Ruby On Rails Engineer, where you'll thrive in a collaborative and ownership-driven culture. With a strong focus on employee growth, you'll have the opportunity to take on technical leadership responsibilities while working on large-scale SaaS platforms that make a real impact. Enjoy a hybrid work model, competitive salary, and the chance to mentor fellow engineers in a fast-paced environment that values innovation and continuous improvement.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Ruby On Rails Engineer
✨Tip Number 1
Network like a pro! Reach out to your connections in the tech industry, especially those who work with Ruby on Rails. A friendly chat can lead to insider info about job openings or even referrals that could get you in the door.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your best Ruby on Rails projects. Whether it's a personal project or contributions to open source, having tangible examples of your work can really impress potential employers.
✨Tip Number 3
Prepare for technical interviews by brushing up on your problem-solving skills. Practice coding challenges and be ready to discuss your past experiences with backend development and architectural decisions. We want you to shine!
✨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 are proactive and take the initiative to connect with us directly.
We think you need these skills to ace Senior Ruby On Rails Engineer
Some tips for your application 🫡
Tailor Your CV:Make sure your CV highlights your experience with Ruby on Rails 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 this role and how your background makes you a perfect fit. We love seeing enthusiasm and a bit of personality!
Showcase Your Problem-Solving Skills:In your application, mention specific challenges you've tackled in previous roles, especially those related to backend development. We’re looking for someone who can think critically and solve complex problems, so let us know how you’ve done that!
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way to ensure your application gets into the right hands. Plus, it shows us you’re keen on joining 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 monolith architecture. They’ll likely ask you to solve a problem or explain a complex concept, so practice articulating your thought process clearly.
✨Showcase Your Problem-Solving Skills
Since this role involves tackling complex backend challenges, be ready to share specific examples of how you've approached and solved similar problems in the past. Use the STAR method (Situation, Task, Action, Result) to structure your answers and highlight your debugging capabilities and technical ownership.
✨Demonstrate Your Leadership Experience
As a Tech Lead, they’ll want to see your ability to guide and mentor other engineers. Prepare to discuss your experience leading Agile ceremonies, scoping technical work, and how you’ve supported team effectiveness in previous roles. Highlight any instances where you took ownership of delivery and drove improvements in engineering standards.
✨Communicate Clearly and Collaboratively
This role requires excellent communication skills, especially when explaining technical concepts to non-technical stakeholders. Practice conveying your ideas simply and effectively. Be ready to discuss how you’ve collaborated with cross-functional teams and how you handle feedback and differing opinions in a fast-paced environment.
