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) 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. Key responsibilities include: 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 approachDesirable / 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 environmentAbout 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