Senior Software Engineer

High Five is hiring on behalf of a fast-growing, tech-enabled services platform offering on-demand home services—from cleaning to babysitting—via web and mobile apps.

Recognized by the Financial Times as one of Asia-Pacific’s Fastest Growing Companies 2025 and listed among Singapore’s Top 100 Fastest Growing Companies 2025, the company is on a mission to make everyday help easily accessible.

What You’ll Be Doing

• Own medium‑to‑large features and domain refactors in Rails, including data‑model design, performance tuning, and background job orchestration.
• Author and socialise tech design docs for backend‑heavy initiatives; review peers’ designs.
• Break epics into stories, estimate, and drive incremental delivery.
• Occasionally extend existing React/TypeScript code to wire new endpoints or tweak UI flows; deeper FE work is delegated or paired.
• Lead code reviews with a focus on Rails quality, DB indexes, query optimisation, and test depth.
• Mentor 1‑2 juniors; take primary on‑call shifts and own post‑mortems.

About You

• 5‑8 yrs in production systems, ≥ 4 yrs deep in Rails; strong Postgres and ActiveRecord optimisation skills.
• Proven record of shipping user‑impacting features and driving performance wins in large Rails codebases.
• Comfortable making incremental changes in React/TypeScript, but primary strength is backend.
• Hands‑on with test automation, CI/CD pipelines, Docker‑based deploys.
• Experience mentoring juniors and raising code‑quality bars.
• Ability to instrument code and interpret dashboards for reliability metrics.

Tech Stack You’ll Work With

• Backend: Ruby (3.2), Ruby on Rails (7+), Redis, Postgres.
• Architecture: Monolith split into domains; interactor pattern.
• Testing: RSpec, VCR.
• Monitoring: New Relic, Sentry.
• Cloud & Infrastructure: Digital Ocean, Docker.
• CI/CD & Dev Workflow: CircleCI, GitHub, trunk‑based development, GitHub Issues.

Interview Process

• Take‑home problem‑solving challenge (1‑2 hrs).
• Paid take‑home project implementing Rails business logic (4‑6 hrs).
• Technical Review call to discuss solutions & career achievements.
• Culture‑fit call with our CEO.