Mid-Senior Ruby on Rails Engineer (B2B SaaS | Hybrid | UK)

We are hiring a Mid-Senior Ruby on Rails Engineer to own and evolve our operational systems, ensuring stability and production reliability in close collaboration with cross-functional teams.

Strategic Context

Transreport exists to remove structural barriers in rail travel. Our vision is that everyone has access to travel everywhere.

As a Series A technology company and recipient of a King’s Award, we operate across the UK, Japan and the EU, delivering award-winning accessibility and safety platforms that have supported over 10 million assistance requests for more than 1 million users.

As our operational demands grow, our backend systems must support increasing integrations, regulatory complexity, data volume, and reliability expectations.

Outcomes & Impact

Within 6 months, you will:

• Take ownership of two operational Rails platform.
• Improve test coverage and architectural documentation (e.g., C4 models).
• Stabilise key third-party integrations and reduce recurring production issues.
• Strengthen monitoring and observability practices.
• Act as a trusted backend partner for Product and Platform teams.

Within 12 months, you will:

• Confidently own and evolve multiple backend systems.
• Improve database performance and background job efficiency.
• Reduce operational risk across TOC integrations.
• Strengthen CI/CD reliability and deployment confidence.
• Contribute to longer-term backend architecture improvements and scalability planning.

Responsibilities

• Own & Evolve Backend Systems: Maintain and improve our Ruby on Rails applications supporting operational workflows.
• Technical Quality: Write clean, well-tested code and uphold strong security and data integrity standards.
• Integrations: Manage third-party integrations, ensuring reliable and secure data exchange.
• Infrastructure Collaboration: Work with the Platform team on AWS-based deployments and CI/CD processes.
• Performance & Reliability: Optimise background processing and database performance to maintain system stability.
• Incident Response: Support investigation and resolution of production issues.
• Cross-Functional Collaboration: Partner with Frontend and Mobile engineers to deliver robust, scalable APIs.
• Continuous Improvement: Contribute to improving deployment practices, monitoring, and long-term maintainability.
• Operational Accountability: Act as the technical owner of production systems that directly impact live rail operations, ensuring high availability and rapid incident resolution.

Must Haves

• 4+ years of professional experience with Ruby on Rails.
• Strong understanding of object-oriented programming and Rails architecture
• Extensive experience with PostgreSQL, including performance tuning and complex queries.
• Experience with background job processing using Sidekiq and Redis.
• Solid understanding of RESTful API design, JSON serialization, and authentication (e.g., JWT, SSO).
• Hands-on experience with AWS services and containerised deployments (Docker).
• Experience troubleshooting and supporting production systems.
• Comfortable working within and improving existing codebases.
• Ability to prioritise effectively and manage multiple initiatives.
• Strong written and verbal communication skills in English.
• Experience working in Agile/Scrum environments with Git/GitHub.

Nice to Haves:

• Experience working with SOAP/XML integrations.
• Experience migrating serverless components (e.g., AWS Lambda) into Rails applications.
• Familiarity with Vue.js to support frontend collaboration.
• Experience working with mobile applications (React Native / Kotlin / Swift).
• Experience working in regulated industries or multi-client B2B systems.
• Contributions to open-source Ruby projects or technical blogging.

• Private healthcare after your probation (including children)
• Hybrid working model
• 25 days holiday
• Volunteering Leave
• Free flu jab for you and your family

Culture & Operating Principles

We value:

• Ownership over hierarchy
• Clarity over bureaucracy
• Impact over job titles

We operate with high autonomy and high accountability. People are expected to raise risks early, communicate clearly, and take responsibility for outcomes.