STEF OLTHOFF

Technical founder at Bloom.

Experience
Bloom Nov 2025 – Present
Technical Founder
  • Founding engineer and sole technical hire. Own a Dockerized TypeScript monorepo and all infrastructure on DigitalOcean, including Postgres.
  • Shipped an AI indexing pipeline on Google Gemini and Twelve Labs Marengo – natural-language search across millions of images and videos.
  • Architected media upload and storage on Redis and BullMQ queues into Cloudflare R2, fronted by a Next.js grid that renders tens of thousands of items instantly via CDN-cached Cloudflare Transformations.
  • Created an Electron desktop app that scene-detects a 2+ hour video with ffmpeg and exports 40+ GIFs in seconds.
  • Made markdown editing collaborative in the style of Google Docs, on Yjs CRDTs that make conflicts impossible.
  • Stood up billing on Stripe with tiered plans and trials, an internal feature flag system, and PostHog instrumentation on retention and conversion.
  • Backed it all with 750+ Vitest suites (unit plus integration against real Postgres) and 65 Playwright end-to-end specs, plus commit-time static gates that block unsafe database mutations and untyped escape hatches before CI.
Tetra Tech Jul 2023 – Oct 2025
Lead Full-Stack Engineer
  • Lead engineer across ~20 climate data projects supporting scientists at NOAA and the NSF.
  • Delivered a particle simulation app for coastline oil spills and lost-vessel search, used by regional coastal offices for emergency training.
  • Gave New England Aquarium researchers a Next.js dashboard for the endangered Right Whale – mating trends, injuries, and the health status of every identified animal.
  • Wrote a React and D3 charting library for granular climate data, then wrapped the components as WordPress plugins so non-technical staff could build their own tools.
  • Unified credentials across the team's 50+ NOAA micro-applications behind a centralized JWT authentication system.
NewFoundry Jun 2020 – Jun 2021
Full-Stack Engineer
  • Lead developer on 8 client projects at a software shop, spanning every stack and stage of maturity.
  • Replaced a pen-and-paper medication system that risked dangerous mixups with a React Native app for in-home caregivers.
  • Launched a custom search engine for a digital coupon catalogue on AWS CloudSearch, fine-tuning the weighting algorithm.
Wisely Sep 2018 – Mar 2020
Lead Engineer, Sentiment
  • Took a proof-of-concept from zero revenue to $1.1M ARR and 300+ national restaurant brands in 18 months, on Vue, TypeScript, and Postgres microservices.
  • Owned the review ingestion pipeline – tens of thousands of AWS SQS jobs per day across 10 APIs including Google Maps, Facebook, and TripAdvisor, with abstractions that unified webhooks and deduplicated batch backfills.
  • Sole engineer for the first year, then led a team of three. The product played a key role in Wisely's $187M acquisition by Olo in 2021, and now powers guest intelligence for 600+ brands.
University of Michigan Jan 2017 – Sep 2018
Software Engineer
  • Built a Coursera integration for the university using Python, Jupyter Notebooks, and Docker.
Education
University of Michigan
Bachelor of Science in Computer Science, 2018