· 6 min read
Splitmix32: Thirteen Lines of Beautiful Randomness
I went looking for a seeded PRNG in TypeScript and found splitmix32, a 32-bit pseudorandom number generator so elegant it made me want to understand every single bit.
Alberto Schiabel
@jkomyno · DX Software Engineer · Speaker · Computer Scientist
@jkomyno
DX Software Engineer · Computer Scientist
Conference Speaker Tbilisi, Georgia
Currently building agentic applications.
Previously shipped tools used by over a million developers.
$ Let's work together. Email me or book a meeting(opens in new tab).
Warehouse Route Optimization
I built a warehouse optimizer from scratch, solo, before LLMs: barcode scans, stock selection, pick routes, and inventory updates. In microseconds, it computes virtually optimal constrained routes that'd require hours to solve with a mathematically exact solver.
View case study →
Lambda Days 2024
My introductory talk on Effect, the composable functional framework for TypeScript. It offers type-safe errors, fiber-based concurrency, resource safety, and built-in tracing.
View talk →
Barcode Scanners Are Keyboards
How UPC-A barcodes encode data, how scanners decode them, and why your barcode reader acts like a keyboard.
Read article →Projects
Open-source tools, investigations, and enterprise platforms I've built.
package-resolution
Systematic investigation of how ESBuild, Rolldown, Vite, Webpack, and RsBuild resolve conditional exports in package.json. Motivated by bundler issues integrating the Prisma 6/7 Query Compiler (WebAssembly) with metaframeworks that each use their own bundlers and configuration.
Bundlers JavaScript TypeScript
uniku
Universal TypeScript ID generator that unifies UUID v4/v7, ULID, TypeID, CUID v2, Nanoid, KSUID, ObjectID, TSID, and XID under a single ESM-only package. Tree-shakeable and built for Node.js, Deno, Bun, browsers, and edge runtimes.
TypeScript Unique ID Generation Library
CZ Fuel Pipeline Optimization
Built the data and execution layer for a MILP-based optimizer that plans multi-product pipeline flows, tank constraints, and train imports for CEPRO with CTU Prague researchers.
Mathematical Optimization MILP Python
Tools
Self-contained interactive utilities I've built for everyday use.
TypeScript Playground
Write, type-check, compile, and run TypeScript in the browser. Powered by CodeMirror 6, the TypeScript language service, and a native Web Worker.
CodeMirror 6 TypeScript ES modules Web Worker
runs locally Unique ID Generator
Generate and inspect UUID v4/v7, ULID, TypeID, CUID v2, Nanoid, KSUID, ObjectID, TSID, and XID. Powered by my library uniku.
uniku crypto.getRandomValues
runs locally Experience
Roles in developer tooling, AI infrastructure, and open source.
May 2025 – Present
Framework-agnostic infrastructure layer for AI agents. Open-source CLI and SDK give LLMs access to 1000+ apps and integrations.
- – Built the Composio CLI from scratch with Effect.ts and Bun, designed for AI agents and humans alike. Progressively replacing the web app for core workflows: OAuth2 login, project discovery, remote tool execution, and type-safe codegen across 1000+ supported apps
- – Shipped features across the open-source TypeScript and Python SDKs giving agents access to 1000+ apps and integrations
- – Implemented server-to-server OAuth2 authentication flows and backend services for the Composio platform
TypeScript Effect.ts Bun Python Next.js AI SDK
Apr 2022 – May 2026
ORM internals, Rust-to-Wasm compilation pipeline, open-source. Features shipped to ~1M developers.
- – Ported bloated, I/O-heavy Rust modules to TypeScript-friendly Wasm libraries in v5 and v6, shipping Driver Adapters from MVP to GA and enabling Prisma on Cloudflare Workers and Vercel Edge
- – Led the Prisma 7 release, the largest architectural refactoring in Prisma's history, surfacing breaking changes that even EMs and PMs had lost track of. Designed and implemented prisma-client, the new default Client generator, born from my bundler/metaframework resolution research
- – Pitched, designed, and implemented prisma.config.ts, a central TypeScript-first configuration system later adopted for Prisma's paid products like Prisma Postgres
- – Write the core infrastructure of Prisma Next, a full TypeScript rewrite that enables long-requested features like strongly-typed JSON columns with Standard Schema support
- – Interviewed 30+ candidates and onboarded 4 engineers into a team that scaled between 2 and 11 people over multiple org reshuffles
Rust WebAssembly TypeScript Node.js Cloudflare Workers
Jan 2023 – Nov 2023
MILP-based optimizer for Czech Republic's national fuel pipeline network
- – Built the data and execution layer for a MILP-based optimizer scheduling petroleum across 1,100 km of pipeline
- – Modeled multi-product pipeline flows, tank constraints, and train imports with Python
- – Reduced monthly planning time from days to hours
Python Flask Celery Oracle DB SCIP
Jun 2019 – Aug 2019
Bachelor's thesis internship, distributed serverless architecture on AWS
- – Designed and implemented a distributed serverless architecture on AWS using Go, Protobuf, and Redis Cluster
- – Built an interactive monitoring dashboard with React and TypeScript
Go Protobuf Redis AWS React TypeScript
May 2018 – Mar 2022
Part-time, sole engineer on enterprise apps for logistics and manufacturing
- – Sole engineer on a 14-package warehouse logistics platform, cutting walking distance by 47-83% through route optimization
- – Evolved the optimization engine through three generations: TypeScript, C++/N-API, Rust/Wasm
- – Streamed and processed 100+ MB CSV files between browser and backend via gRPC
- – Built controller apps in Qt/C++ and Haskell for proprietary hardware
TypeScript Rust WebAssembly C++ React Node.js gRPC MSSQL
Feb 2017 – Sep 2017
Founding Engineer · Skydreamer
co-founder remoteGroup travel app that turns traveling with friends into a "Swipe and Match" game. TechCrunch Disrupt 2017
- – Led development of the first React Native prototype, including Firebase-driven OAuth2 login and in-app group chats, navigating ambitious ever-changing design choices and tight deadlines
- – Interviewed and onboarded 10+ international engineers in a fully remote team
React Native Firebase JavaScript
Jul 2016 – May 2019
One-person R&D department: prototyped new product ideas while maintaining full-stack platforms for smart building management and digital process automation
- – Ran all R&D for the company, experimenting with technologies and product concepts to find new market opportunities
- – Built and maintained full-stack web platforms for smart building management and digital process automation (DPA); part of this work eventually became VirtusFlow
- – Introduced automated testing to fix 1000+ bugs in a legacy codebase
Node.js TypeScript Python PostgreSQL Redis
Education
Formal education in computer science and software engineering.
Mar 2021 – Jan 2022
Research Internship
MSc Thesis research in Submodular Optimization with Probabilistic Methods
Czech Technical University in Prague(opens in new tab) · 2021
Sep 2016 – Dec 2021
Master's Degree (3 + 2 years)
Computer Science (Software and Artificial Intelligence)
University of Padua(opens in new tab) · Graduated with honors
Sep 2011 – Jul 2016
High School Diploma
Computer Science
Technical Technological Institute Volterra, San Donà di Piave(opens in new tab) · 100/100
Speaking
Conference talks and meetup presentations on TypeScript, Rust, and developer tools.
19 talks & workshops 10+ countries Rust · Wasm · TypeScript · DX
Armada JS Talk
Coping with JavaScript cross-Runtime Incompatibilities
Dec 2024 Novi Sad
RustFest Zürich Talk
Towards Zero-Copy Binary (De)Serialisation in TypeScript
Jun 2024 Zürich
Lambda Days Talk
An Effect-ful functional framework for TypeScript
May 2024 Kraków
Skills
Languages, frameworks, and tools I reach for when building. I've used many more over the years; these are the ones that stuck.
Current
TypeScript Node.js + Bun Effect SQL Cloudflare Workers @ai/sdk Claude Code
Rusty (shipped before, would need to catch up)
WebAssembly Rust Python 3 Keras C++17 Redis AWS Lambda Haskell React
Writing
Blog posts and technical articles on what I'm working on or learning.
· 12 min read
Barcode Scanners Are Keyboards With Extra Steps
From bars and spaces to keystrokes in your input field. How UPC-A barcodes encode data, how scanners decode them, and why your barcode reader acts like a keyboard.
Gists
Code snippets and idioms I keep coming back to.
Reviews
What colleagues and collaborators have said about working with me.
Alberto, you consistently bring boldness, clarity, and thoughtfulness into the room. You hold us accountable, you are precise in your words, and you always read the room with grace. Thank you for embodying the spirit of open, constructive dialogue!
Alberto is an extremely knowledgeable software developer. He is also a collaborative engineer with lots of insight that goes beyond development. He has a keen eye for detail and is always looking to improve his knowledge. I highly recommend Alberto!
Bookmarks
Articles, tools, and resources by other people that shaped how I think about software.
47 bookmarks articles, tools & resources
Article Christos Tzamos
Can LLMs Be Computers?
Tool justrach
nanobrew
Article Drew Breunig
Tutorial: Learn DSPy by Building a Deep Research Agent
Article Cyrus Najmabadi
Persistence, Facades and Roslyn's Red-Green Trees
Connect
Where to find me on the internet.