Senior Rails Backend Engineer - Hybrid London

FRESH.; Greater London; Hybrid; GBP 85,000 - 100,000; Full time

Job summary

FRESH, a fast-growing B2B SaaS company, is hiring a Senior Ruby on Rails Developer in London to strengthen the core backend of its Passenger Assistance platform, helping scale customer onboardings and reduce bottlenecks. You will own technical direction, design scalable back-end services and RESTful APIs, optimise background jobs with Sidekiq, and mentor engineers within a cross-functional product squad.

This is a high-growth, purpose-driven role offering significant technical leadership

Qualifications

• Strong commercial experience with Ruby on Rails in production environments.
• Solid understanding of Rails monolith architecture and full-stack troubleshooting.
• Experience building and maintaining RESTful APIs.
• Strong knowledge of PostgreSQL, Redis, and Sidekiq.
• Comfortable working with AWS infrastructure.
• Experience using Docker in development or production environments.

Responsibilities

• Own technical direction and architecture decisions within the Rails application
• Design, build, and maintain scalable backend services and RESTful APIs
• Optimise background job processing using Sidekiq
• Help improve onboarding scalability and reduce backend delivery bottlenecks
• Identify technical risks early and balance trade-offs between speed, quality, and scope
• Collaborate within a cross-functional product squad
• Support and mentor engineers through technical leadership and problem-solving

Skills

Backend development

Architecture decisions

Technical leadership

Mentoring

Tools

Ruby on Rails

PostgreSQL

Redis

Sidekiq

AWS

Docker

Job description

FRESH, a fast-growing B2B SaaS company, is hiring a Senior Ruby on Rails Developer in London to strengthen the core backend of its Passenger Assistance platform, helping scale customer onboardings and reduce bottlenecks. You will own technical direction, design scalable back-end services and RESTful APIs, optimise background jobs with Sidekiq, and mentor engineers within a cross-functional product squad.

This is a high-growth, purpose-driven role offering significant technical leadership