Senior Software Engineer (Ruby on Rails)

Addooco is a managed IT, cloud, and communications solutions provider specializing in enterprise-grade services for businesses of all sizes. Established in 2008, the company operates across the United Kingdom region and beyond, focusing on proactive management and in-house developed solutions delivered through their own datacenter infrastructure.

Overview

We are seeking a highly skilled Senior Software Engineer specialising in Ruby on Rails to join our dynamic team. In this role, you will contribute to designing and developing innovative software solutions that support our clients’ needs and align with our mission to deliver top-tier IT services.

Qualifications

Required skills & experience

5+ years professional software engineering experience

3+ years Ruby on Rails experience (Rails 7-8 preferred)

Geospatial data experience (PostGIS, RGeo, or similar geospatial libraries)

Multi-tenancy architecture and database sharding

Background job processing (Sidekiq, Resque, or similar)

RESTful API design and development

Payment gateway integration (Stripe, Adyen, or similar)

Git version control and GitHub workflows

Automated testing experience (Minitest, RSpec, or similar)

Experience with WebSockets and real-time features (ActionCable or similar)

Highly desirable

Laravel/PHP experience (for cross-team support)

Cloud services such as S3, SES, EC2, RDS etc.

Twilio or other SMS/communication APIs

Experience taking over codebases from external teams

Previous experience in transport/logistics/dispatch systems

Responsibilities

Technical leadership:

Act as a product expert for ongoing team projects

Provide technical guidance and mentoring to mid-level engineers

Review code and provide constructive feedback

Make architectural decisions for the Ruby backend

Establish coding standards and best practices for the team

Development:

Take ownership of an existing system from an external vendor during a handover period

Develop new features for the system

Maintain and improve existing functionality

Optimise geospatial algorithms and database queries

Integrate third-party APIs (payment providers, SMS, etc.)

Write comprehensive automated tests (unit, feature)

Operations:

Participate in 24/7 on-call rotation for system downtime events

Investigate and resolve production issues

Monitor system performance and implement improvements

Collaborate with DevOps on deployment and infrastructure

Work directly with stakeholders to understand requirements

Coordinate with frontend team on API contracts

Provide input to project planning and estimation

Support other teams when cross-functional needs arise

Knowledge transfer:

Build comprehensive understanding of existing system during handover

Document complex systems and architectural decisions

Share knowledge with mid-level team members

Prepare the team to mentor junior engineers in the future

Key success metrics

Successfully complete handover and take full ownership of existing system from external vendor within 3 months

Deliver new features while maintaining code quality (test coverage >90%)

Build effective team processes and establish technical standards

Develop mid-level engineers' capabilities through mentoring

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