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.
• Deep fluency in REST APIs, OAuth 2.0, webhooks, WebSocket protocols, and HTTP debugging.
• Strong programming ability in at least two of: Python, JavaScript/TypeScript, Go, Java.
• Experience debugging distributed systems, reading logs, tracing requests, and correlating events across services.
• Clear, precise written and verbal communication.
• Default-to-yes attitude with extreme follow-through.

Strong Preference

• Experience working with health, fitness, or wearable data.
• Familiarity with data normalisation challenges: inconsistent schemas, missing fields, timezone chaos, unit conversion, provider-specific quirks.
• Prior experience in a high-velocity startup environment.
• 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.

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.

By submitting this application, I agree that my personal data will be collected, processed, and retained by the company solely for the purposes of managing and assessing my candidacy.