Mid-Senior Ruby on Rails Engineer (B2B SaaS | Hybrid | UK) in City of London

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Job Description
B2B SaaS | Hybrid – 2-3 days office | UK
Location: London
Type: Full-time
Role Overview
Accessible rail travel depends on systems that work reliably in live environments.
Our Passenger Assistance platform turns passenger assistance requests into coordinated action inside live rail operations.
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.
Requirements
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 / Kotlin / Swift). Experience working in regulated industries or multi-client B2B systems. Contributions to open-source Ruby projects or technical blogging.
Benefits
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.
Interview Roadmap
Screening Call (30 mins) – Recruiter alignment Technical Exercise – Rails architecture & integration discussion Deep Dive Interview – Engineering & Product Final Culture Conversation – Leadership alignment
We aim to complete the process within 4 weeks.
Guaranteed Interview Scheme
We’re a Confident employer and we welcome applications from disabled candidates. If you need any adjustments at any stage of the recruitment process, please tell us what would help - we’ll work with you to make the process as accessible as possible.
We also offer a Guaranteed Interview Scheme (GIS) for candidates who consider themselves to have a as defined under the Equality Act 2010.
If you indicate this option in your application and your application demonstrates that you meet the essential criteria for the role, you’ll be invited to interview or assessment.
Choosing GIS doesn’t guarantee a job offer. If you have any questions, please get in touch.
If you are interested in applying for this job please press the Apply Button and follow the application process. Energy Jobline wishes you the very best of luck in your next career move.
Apply
Location:
City Of London
Job Type:
FullTime
Category:
Engineer, B2B, Saas, Senior, Engineering, Hybrid

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