Senior Software Engineer (Backend)

TL;DR

Senior Software Engineer (Backend): Building and scaling core platform systems for a health data operating system with an accent on API design, real-time streaming pipelines, and data normalization. Focus on architecting high-throughput data ingestion connectors, hardening authentication layers, and ensuring 99.5%+ uptime for billions of health data events.

Location: Office in London

Company

Terra is a health operating system that normalizes fragmented data from wearables and sensors into a single platform for developers and AI labs.

What you will do

• Design and extend systems to ingest and normalize health data from 100+ providers into a standardized schema.
• Architect and build new upstream connector capabilities, defining ingestion contracts and enforcing data quality SLAs.
• Scale real-time streaming infrastructure for live sensor data via websocket listeners with sub-second latency.
• Own the authentication layer, including OAuth flows, API key management, and RBAC for over 1,000 developers.
• Design and harden the webhook delivery system to ensure guaranteed event delivery at scale.
• Build backend systems that transform raw health metrics into research-backed health scores.

Requirements

• 5+ years of production backend engineering experience with battle-tested infrastructure at scale.
• Deep API design experience with REST APIs, including versioning, rate limiting, and pagination.
• Strong expertise in distributed systems, message queues, and event-driven architectures.
• Deep proficiency in Python and/or Go.
• Expertise in PostgreSQL, Redis, and time-series stores.
• Cloud-native mindset with AWS/GCP, containers, and Infrastructure as Code.

Nice to have

• Personal obsession with quantified-self data or being an athlete.

Culture & Benefits

• High-velocity environment that prioritizes first principles and shipping fast over bureaucracy.
• Equity for all team members to ensure skin in the game.
• Culture of Deep Work with a strict "no meeting" focus to protect productivity.
• Antifragile approach where incidents and chaos are used as catalysts for improvement.