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Senior Product Engineer
Northwind Labs · Zurich · Hybrid
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Product engineer with 8 years across startups and scale-ups, currently leading a 5-person squad. I ship end-to-end: React front-ends, Node and Python APIs, and the event pipelines behind them. Two 0-to-1 products launched, one taken from private beta to 40k monthly active users. Happiest when I'm talking to users on Monday and shipping the fix on Thursday.
Experience
Senior Product Engineer / Tech Lead
Northwind Labs · Zurich, CH
2022 — Present
- Led the rebuild of the onboarding flow (React, TypeScript, Remix) — activation up 18% and support tickets down 31% in one quarter.
- Designed the event streaming pipeline (Kafka, ClickHouse, dbt) powering live product analytics for 40k monthly active users.
- Introduced trunk-based delivery with feature flags; release frequency went from weekly to ~12 deploys a day.
- Mentored three engineers to mid/senior level and started the RFC process now used across all four product teams.
- Cut cloud spend 24% (~CHF 90k/year) by right-sizing services and moving cold analytics data to object storage.
Full-stack Developer
Helio · Remote (EU)
2019 — 2022
- Built the Stripe billing integration and self-serve plan management used by 2,300 paying teams.
- Cut p95 API latency from 900ms to 220ms through query tuning, Redis caching and N+1 elimination.
- Shipped the public REST + webhook API, including docs and an OpenAPI-generated TypeScript SDK.
- Set up the first CI pipeline (GitHub Actions, Playwright) taking test coverage from 12% to 71%.
Frontend Developer
Studio Kestrel · Barcelona, ES
2018 — 2019
- Delivered eleven client web apps in React and Vue, from wireframe to production hand-off.
- Built a shared component library that cut new-project setup from two weeks to three days.
- Brought every delivered site to WCAG 2.1 AA and Lighthouse performance scores above 95.
Projects
trailheadgithub.com/sarivera/trailhead
Open-source CLI that scaffolds data pipelines from a YAML spec. 1.2k GitHub stars.
- Used in production by four companies; 30+ external contributors.
- Plugin system for custom sources and sinks, fully typed in TypeScript.
Zurich Frontend Meetupzurichfrontend.ch
Co-organiser of a 600-member meetup; run quarterly evenings and the CFP process.
- Spoke on 'Streaming UIs with React Server Components' (2024).
Education
MSc Computer Science · ETH Zurich — Focus on distributed systems and data engineering. Thesis on incremental stream joins (grade 5.75/6).
2015 — 2017
BSc Informatics Engineering · Universitat Politècnica de Catalunya — Graduated with honours. Erasmus semester at TU Delft.
2012 — 2015