~ kolja ~
~ hi, i'm ~

Kolja
Blauhut

founding engineer

Five-plus years building & shipping production web, mobile, and real-time systems in early-stage startups. Berlin & New York City, US citizen.

~ about ~

The Tale So Far

Founding full-stack engineer with five-plus years of experience taking products from idea to production. Strong focus on 0→1 development, performance, and close collaboration with design and product teams.

01.Experience
Bounti
~ Founding Software Engineer ~
Jan 2023 — Nov 2025

Learning management platform for frontline workers — bounti.co

  • Owned and shipped core LMS features from 0→1, including course creation, assignment logic, and update workflows (React, Node.js, PostgreSQL)
  • Built the employee-facing course completion experience with real-time progress tracking
  • Led end-to-end development of the Audit feature for structured store-level compliance checks
  • Implemented and maintained the ABR video encoding pipeline for scalable training content delivery
  • Partnered closely with design and product to iterate rapidly based on user feedback
Circls
~ Founding Software Engineer ~
Aug 2022 — Jan 2023

Remote-work video communication startup

  • Built and shipped the cross-platform Electron app enabling real-time video communication
  • Designed and implemented seat management infrastructure across frontend and backend (TypeScript, Node.js)
  • Delivered core product features in a small founding team environment with rapid iteration cycles
Luca
~ Full-Stack Software Engineer ~
Mar 2021 — Jul 2022

German COVID tracking app with 40M users during the pandemic — luca-app.de

  • Designed optimized exposure-notification API endpoints, reducing infrastructure costs by €30k/month
  • Worked on a secure certificate chain mechanism ensuring encryption keys were signed by the German government, preventing injection of fake public keys
  • Assisted debugging and mitigation during time-critical production incidents in close collaboration with the CTO and backend lead
02.Apps
Early Access
~ AI journal for goals ~

DayArc Journal

One short AI-guided journal conversation in the morning, one before bed — and a record of how the day actually went. Evening reflections recall your specific morning goals by name. No streaks, no badges, just honest daily check-ins.

visit site →
Coming Soon
~ Dividend tracker for Interactive Brokers ~

DividendFlow

Connects to your IBKR account to track what you've earned, forecast what's coming, and ping you the moment a payout hits. All data processed locally on-device — nothing leaves your phone.

visit site →
03.Projects
hand-tuned

Levenshtein SIMD

~ C++ ~

Highly optimized Levenshtein distance using the Myers bit-parallel algorithm accelerated with ARM Neon SIMD intrinsics. Built for a TU Berlin stream-processing competition.

view on github →
tiny + fast

Bloomit

~ TypeScript ~

Efficient Bloom filter library for TypeScript / JavaScript focused on minimal memory footprint and high performance.

view on github →
2.5-D

Doom Device

~ C++ ~

Software rendering engine using raycasting and portals to draw scenes in the spirit of the original DOOM. Runs on web canvas and an ESP32 microcontroller.

view on github →
MDN

Handwriting Transformer

~ Python ~

Transformer that generates realistic synthetic handwriting sequences by emitting continuous probability distributions over pen coordinates and sampling trajectories.

private work
04.Say Hello

hello!

Berlin, Germany  ~  New York City, NY

koljablauhut@gmail.com
~ thanks for scrolling ~