Senior Ruby On Rails Engineer

Senior Ruby On Rails Engineer / Tech Lead

Location:

London (Hybrid – 2 days per week onsite)
Salary:
Up to £100,000 (DOE)

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.

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

• 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 Postgre
  
  SQL, 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

• 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 with in B2B SaaS or operational platform environments
• Experience supporting live production systems at scale
• Experience mentoring or supporting engineers within a team environment

• 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

Ruby
Ruby on Rails
PostgreSQL
Redis
Sidekiq
REST APIs
AWS
Docker
Kubernetes
Jira, Slack