At TERRA API, we make it easy for health data to transfer, for developers and AI agents


Terra API

About The Company

about terra

Terra is the health operating system.

we make it easy for developers and AIs to build on health data. hundreds of wearables, sensors, labs, and health apps — connected, normalized, and made intelligent through a single platform. 1,000s of developers and AI labs build on Terra today. we process 15+ billion health data events per year. and we are just getting started.

the health OS

health data is fragmented. every device, every app, every sensor speaks a different language. we built the health OS to solve that — a full-stack platform that turns raw, messy, siloed health data into something developers and AIs can reason over, build on, and ship with.

Terra was founded in 2021 and operates from London, San Francisco, and South Korea.

we are funded by Y Combinator (W21), General Catalyst, Samsung NEXT, NEXT Ventures, and many of the world's finest investors.

we are a team of engineers, researchers, builders, and designers. we hire people who get things done, think from first principles, and learn ferociously. we default to yes. we ship fast. we hack. we build. we don't do bureaucracy.

events

we show up where the future of health is being shaped.

Stanford

 MIT Imperial College

the terra podcast

About The Role

The Role

Terra is the unified API for health and fitness data. We connect developers and AI labs to 500+ wearable, sensor, and biomarker sources through a single normalised schema. Over 15 billion health data events flow through our infrastructure every year. The companies building the world's best health products run on Terra.

We are hiring a Senior Customer Engineer — someone who can operate at the intersection of deep technical ability and customer-facing ownership. This is not a support role with scripts and macros. This is an engineering role where the customer is the context. You will be the most technical person our customers ever talk to, and the most customer-aware person on our engineering team.

You will own the full integration lifecycle: from first API call to production-grade data pipeline. You'll debug webhook delivery, troubleshoot OAuth flows across dozens of wearable providers, write reference implementations, and ship tooling that makes every developer on Terra's platform more successful. When something is broken at 2am and a customer's health app is down, you're the person who fixes it and then writes the runbook so it never happens again.

What You Will Do

Lead technical onboarding for customers integrating with the Terra API — from initial sandbox setup through production go-live. You are accountable for time-to-first-data. Architect integration patterns tailored to each customer's stack: REST polling vs. webhook-driven pipelines, batch historical backfills vs. real-time streaming, mobile SDK vs. server-side. Build and deliver reference implementations in Python, Node.js, and other languages that demonstrate best practices for consuming normalised health data (activity, sleep, heart rate, workouts, biomarkers). Work directly with customer engineering teams to review their integration code, flag anti-patterns, and accelerate production readiness.

Debug and Resolve Complex Technical Issues

Troubleshoot data pipeline issues across Terra's infrastructure: webhook delivery failures, data gaps from upstream providers (Garmin, Fitbit, Oura, Apple Health, etc.), OAuth token expiry, and normalisation edge cases. Investigate issues that span multiple systems — from our API gateway and webhook retry logic, through our data normalisation layer, to the customer's receiving endpoint. Reproduce customer-reported bugs, isolate root causes, and either fix them yourself or deliver precise, actionable bug reports to internal engineering with reproduction steps, logs, and proposed fixes. Own incident communication for customer-impacting issues: clear, honest, and technical. No hiding behind "we're looking into it."

Build Internal Tooling and Automation

Identify patterns in customer issues and build tooling to eliminate them. If five customers hit the same webhook misconfiguration, build a validator. If a data gap keeps recurring from a specific provider, build the monitoring. Contribute to Terra's developer documentation, API reference, integration guides, and troubleshooting runbooks. Write docs that actually save engineers time. Develop internal dashboards and diagnostic tools to accelerate issue resolution — query health, webhook delivery status, data freshness, provider connectivity. Automate repetitive operational tasks: data backfills, provider re-authentication, account provisioning, compliance reviews.

Be the Voice of the Customer to Engineering

Translate customer feedback into concrete product requirements. You are the bridge between what customers need and what the platform ships. Identify API gaps, missing data fields, broken normalisation mappings, and DX friction — and drive fixes by working directly with the product and infrastructure teams. Maintain a running view of the most common integration pain points and advocate for platform changes that reduce them at the root. Participate in architecture reviews for new features and integrations, bringing the customer perspective to design decisions.

Non-Negotiables

5+ years as a software engineer, solutions engineer, or customer engineer at an API-first or developer tools company. You have shipped production code and you have debugged production incidents that weren't yours. Deep fluency in REST APIs, OAuth 2.0, webhooks, WebSocket protocols, and HTTP debugging. You don't just call APIs — you understand what happens at every layer from DNS resolution to response parsing. Strong programming ability in at least two of: Python, JavaScript/TypeScript, Go, Java. You can write clean, production-quality code — not just scripts. Experience debugging distributed systems. You have traced issues across API gateways, message queues, databases, and third-party integrations. You are comfortable reading logs, tracing requests, and correlating events across services. Clear, precise written and verbal communication. You can explain a complex data pipeline issue to a junior developer, a VP of Engineering, and a non-technical stakeholder — each differently and each effectively. Default-to-yes attitude with extreme follow-through. You take ownership, you close loops, and you don't let things drop.

Strong Preference

Experience working with health, fitness, or wearable data. You know the difference between resting heart rate and heart rate variability, and why a customer's sleep data from Oura looks different than from Fitbit. Familiarity with data normalisation challenges: inconsistent schemas, missing fields, timezone chaos, unit conversion, provider-specific quirks. Prior experience in a high-velocity startup environment where you wore multiple hats and shipped fast without permission. Exposure to HIPAA, GDPR, CCPA, and SOC 2 compliance in the context of health data processing. Experience with real-time data streaming, event-driven architectures, or IoT data pipelines. Track record of building developer-facing documentation, SDKs, or sample applications that developers actually used.

How We Work

Terra runs at extremely high velocity. We think from first principles. We default to yes. Everything is buildable and everything is figureoutable. We value resourcefulness over credentials and intensity over hours.

Big Plus

You are an athlete. You train, you compete, you push limits — or at the very least, you are obsessed with quantifying your own data. The discipline, ambition, and courage it takes to show up every day and get better is the same energy we run on. If you understand the data because you live it, you'll build a better product.