Note: The job is a remote job and is open to candidates in USA. Amba is a company that helps carers look after elderly people at home and in care settings by pulling data from sensors and connected devices. They are seeking a Senior Backend Developer with Ruby on Rails expertise to work on their core platform and improve system reliability as they scale.
Responsibilities
- You'll work on the core platform: ingesting sensor data, building tools for carers, and keeping the system reliable as we scale
- Withings webhook redesign - We pull sleep and vital signs data from Withings devices. The webhook pipeline was brittle. We rebuilt it: better error handling, retry logic that doesn't hammer their API, and proper observability. Boring but critical infrastructure work
- Events table partitioning - Our main events table hit 200M rows. Queries are slowing down. We're looking at partitioning by month, migrating historical data, and got query times back under 100ms. PostgreSQL at scale
- AI assistant prototype - We're building "Hey Amba", a conversational interface for care teams. You'd work on the Rails backend that powers it: prompt engineering, streaming responses, keeping sensitive health data secure
- Turbo Native rebuild - Our mobile apps are native iOS/Android with separate codebases. We're migrating to Turbo Native. One Rails codebase. Ship to both platforms simultaneously
- You won't be a ticket-taker. We expect you to push back, suggest better approaches, and own outcomes from idea to production
- You'll review pull requests, mentor where useful, and help shape how we build
Skills
- 5+ years shipping production Rails code
- Strong PostgreSQL skills (complex queries, indexing, performance tuning)
- You've debugged production issues under pressure and know how to prevent them recurring
- Comfortable working across the stack when needed - no artificial boundaries
- Hotwire experience (or you've read the docs and you're curious)
- You've owned infrastructure decisions (deployments, monitoring, database scaling)
- Healthcare, IoT, or high-frequency data processing background
- You care about API design and webhook reliability
Benefits
- MacBook and home office equipment if needed (monitor, etc.)
- 401(k) with immediate eligibility and 100% employer match on the first 4%
- Generous PTO allowance, plus company-approved holidays
- Medical insurance after 30 days with company contribution
Company Overview