Senior Customer Engineer

We make it easy for developers and AIs to build on health data. Hundreds of wearables, sensors, labs, and health apps are connected, normalized, and made intelligent through a single platform. Thousands of developers and AI labs build on Terra today, processing over 15 billion health data events per year.

The health data is fragmented; every device, app, and 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 who hire people who get things done, think from first principles, and learn ferociously. We default to yes, ship fast, hack, build, and avoid bureaucracy.

Terra is the unified API for health and fitness data, connecting developers and AI labs to over 500 wearable, sensor, and biomarker sources through a single normalized schema. 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 the 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 2 am 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 normalized 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 normalization edge cases.
• Investigate issues that span multiple systems — from our API gateway and webhook retry logic, through our data normalization 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.

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 normalization 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.

Strong Preference

• Experience working with health, fitness, or wearable data.
• Familiarity with data normalization 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.

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.