Hamnkapten
1,100+
tests across 14 crates
Sauna booking system for the Gothenburg boatyard where I work. Guests book in a web app, staff run it from a desktop or web admin, and PostgreSQL rules out double bookings. Closed source, in development.
Eric Jingryd
Open to opportunities. Gothenburg · Stockholm · Remote or hybrid
Software Engineer · Rust, security and Linux systems
I build secure systems - mostly in Rust, and in TypeScript, Python, and whatever the problem calls for - from JWT authentication and system hardening to desktop applications and CLI tooling. Every project starts with the same question: how do we make this safe by default?
Working in
Rust
TypeScript
Python
Bash
C
Featured Projects
What I've been building
Constraint Engine
140 ms
median solve, was 42 s
Constraint-satisfaction engine in Rust behind an Actix-web service. AC-3 propagation, MRV and LCV heuristics, parallel backtracking over bitset domains. Closed source.
Raven Nest MCP
46
tools, in the MCP Registry
Pentesting toolkit that runs as an MCP server. Wraps 22 security tools and opt-in Metasploit behind a 6-layer safety architecture.
Linux Hardener
2,300+
tests on 6 distributions
Security automation for Linux with 8 hardening plugins, signed checkpoint rollback and compliance reports against ten frameworks. CLI and desktop app, on the AUR.
BitNet Toy
1.58-bit
weights, no ML crates
BitNet b1.58 from scratch in Rust. SIMD matmul, autograd, a transformer and a CUDA back-end on tensor cores.
Security-First Portfolio
12
headers, each on /security
This site. Actix-web with JWT auth, RBAC and rate limiting. I pentested it myself and publish every control.
Technical Skills
Where I spend my time
Security
Authentication & Authorisation Cryptography (Argon2id) OWASP Top 10 / ASVS Penetration Testing OSINT & Threat Analysis
Backend
Rust (Actix-web) TypeScript (Bun) PostgreSQL & SQLx MCP Server Development RESTful + JSON-RPC
Systems
Linux (Arch daily driver) Virtualisation & Containers Bash & Shell Scripting systemd & Service Management Kernel Hardening
ML & Performance
Machine Learning (Rust + CUDA) cuBLAS / Tensor Cores AVX-512 SIMD Transformer Architectures Quantisation (BitNet b1.58)
DevOps
Git & GitHub CI/CD (GitHub Actions) Docker Compose Automated Testing
Frontend
HTMX (Hypermedia) Tauri Desktop Leptos / WebAssembly Tailwind CSS Alpine.js Accessibility (a11y)
Exploring
Kubernetes Distributed Systems Cloud Infrastructure
Let's Build Something
I'm looking for a team that cares about code quality, security, and having a good time doing it, in a software engineering role on backend, systems or security work. I live in Gothenburg and I'm open to hybrid, remote, or Stockholm.