Bartosz Osiej

19 · Poland · Rust, eBPF, compilers. Built a programming language (192 tests, PyPI), eBPF ransomware tracker, 4 security tools. Everything ships, nothing rots. Open to first paid role.

Joined on Aug 21, 2026

Bartosz Osiej

Sep 21

Externum launches today: one typed source Python, Bash or bytecode (with honest benchmarks)

#showdev #python #compilers #programming

2 min read

Bartosz Osiej

Sep 21

Externum — a typed language that compiles to Python, Bash and bytecode (Show DEV)

#showdev #python #compilers #opensource

1 min read

Bartosz Osiej

Sep 21

I ship open-source security tools solo — here's the full stack, the pricing, and the (zero) revenue so far

#rust #security #opensource #ebpf

4 min read

Bartosz Osiej

Sep 20

I'm Building a Post-Quantum Bitcoin in Rust — and a Test Caught a Real Consensus Bug Tonight

#rust #bitcoin #security #blockchain

3 min read

Bartosz Osiej

Sep 20

Your Antivirus Only Watches. Mine Kills: Building a Detect-and-Respond Agent in Rust + eBPF

#rust #security #linux #ebpf

3 min read

Bartosz Osiej

Sep 19

Externum: a typed language that transpiles to Python and Bash — and its own benchmark caught two real bugs

#compilers #python #bash #programminglanguages

4 min read

Bartosz Osiej

Sep 18

Detecting ransomware with eBPF in Rust

#ebpf #rust #security

4 min read

Bartosz Osiej

Sep 16

bip-calendar

#automation #buildinpublic #opensource

4 min read

Bartosz Osiej

Sep 15

Building a Solana-like validator in Rust: what PoH, Tower BFT and Sealevel actually force you to think about

#rust #blockchain #consensus #systems

3 min read

Bartosz Osiej

Sep 15

eBPF verifier limits are a design constraint: what CO-RE field offsets and bounded loops taught me

#ebpf #rust #kernel #linux

3 min read

Bartosz Osiej

Sep 15

Catching ransomware with eBPF: what execve/openat tracing taught me about false positives

#ebpf #rust #linux #security

2 min read

Bartosz Osiej

Sep 15

A web OS that 'never booted': the two bugs that looked like kernel failures but were 404s and z-index

#web #typescript #debugging #deploy

2 min read

Bartosz Osiej

Sep 15

I made my portfolio readable to AI crawlers: llms.txt, JSON-LD and a 40-method distribution stack

#seo #ai #llms #automation

3 min read

Bartosz Osiej

Sep 5

I built a Linux Security Module that lives in-tree and boots from upstream

#security #linux #kernel #c

3 min read

Bartosz Osiej

Aug 26

I built an eBPF ransomware detector in Rust

#rust #ebpf #linux #security

4 min read

Bartosz Osiej

Aug 26

I built a programming language that compiles to Python, Bash, and binary

#programming #python #rust #compilers

3 min read

DEV Community

Bartosz Osiej

Badges

Writing Debut

Externum launches today: one typed source Python, Bash or bytecode (with honest benchmarks)

Externum — a typed language that compiles to Python, Bash and bytecode (Show DEV)

I ship open-source security tools solo — here's the full stack, the pricing, and the (zero) revenue so far

I'm Building a Post-Quantum Bitcoin in Rust — and a Test Caught a Real Consensus Bug Tonight

Your Antivirus Only Watches. Mine Kills: Building a Detect-and-Respond Agent in Rust + eBPF

Externum: a typed language that transpiles to Python and Bash — and its own benchmark caught two real bugs

Detecting ransomware with eBPF in Rust

bip-calendar

Building a Solana-like validator in Rust: what PoH, Tower BFT and Sealevel actually force you to think about

eBPF verifier limits are a design constraint: what CO-RE field offsets and bounded loops taught me

Catching ransomware with eBPF: what execve/openat tracing taught me about false positives

A web OS that 'never booted': the two bugs that looked like kernel failures but were 404s and z-index

I made my portfolio readable to AI crawlers: llms.txt, JSON-LD and a 40-method distribution stack

I built a Linux Security Module that lives in-tree and boots from upstream

I built an eBPF ransomware detector in Rust

I built a programming language that compiles to Python, Bash, and binary