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# Senior Software Engineer - Lead & Scale Ruby on Rails

- **Company:** Annumat Hnry
- **Location:** London, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Amazon Web Services, Automation of Tests, Code Review, Continuous Delivery, PostgreSQL, Ruby on Rails, Ruby, Software Engineering, Performance Monitor, Terraform, Docker
- **Published:** June 2, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/x/38141459/

## About the Role

development opportunities for junior and intermediate engineersMatt - Head of EngineeringHave at least four years experience working as a Software DeveloperHave exceptional communication and collaboration skills - we work together and succeed as a teamDemonstrate strong problem solving abilities, breaking down complex challenges into actionable solutions while considering long-term maintainabilityTake proactive ownership of system performance, monitoring key metrics, identifying potential risks, and implementing effective solutionsApproach challenges with curiosity, critical thinking, and a deep empathy for the end user, ensuring changes deliver meaningful impactHave significant experience with automated testing, including designing and implementing robust testing strategies to maintain code qualityBring a passion for technical and product design discussions, contributing innovative ideas and driving best practices across the teamHave full working rights in New ZealandBonus points
for the following:Experience building large scale systemsExperience being self-employed (freelancing, contracting etc) in any industry/professionExperience with Ruby on RailsHow we workWe follow agile practices, delivering improvements iteratively in small chunks. We track the impact of our work and measure ourselves on results, not the amount of code writtenWe're growing fast, and are focused on building a well designed, scalable & robust platform. In some areas of the work (e.g. payment processing) there is very little margin for errorOur technology platform is built in Ruby on Rails, and we also use a bunch of AWS services (via Terraform), Postgres, Docker, and a little bit of ReactWe have automated tests, continuous deployment, and release to production multiple times per dayWe review each others code, and set aside time for hacking on experimental features, refactoring and/or learning new thingsWe work hard and finish on time, no crazy hoursSalary banding

## Description

of complex problems by actively engaging with customers and stakeholders across the business, driving innovative solutionsChampion best practices in software development, setting a high standard for robustness, reliability, and performance while guiding the team to follow these practicesTake ownership of delivering high-impact features from concept to production release, including ongoing performance monitoring and optimisationEnsure comprehensive test coverage for all work delivered and drive improvements in test practices across the existing codebaseConduct in-depth code reviews, offering constructive feedback and sharing expertise to elevate the team's technical capabilitiesArchitect scalable, maintainable solutions for new features, clearly communicating design decisions and collaborating with the team to gather feedbackCollaborate with cross-functional teams to align engineering efforts with broader business goalsAct as a mentor and technical leader, providing guidance, support, and


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