Elliot Steffensen

End-to-end encrypted chat on a bare-metal RISC-V microcontroller with no OS or standard library. ChaCha20-Poly1305 AEAD, bit-banged software UART with ISR-driven RX, and a framed protocol with CRC16 integrity. Python client shares the same C crypto code via ctypes.

Team project for KTH course II1302: real-time harbor berth monitoring with a FastAPI + PostgreSQL backend, React + TypeScript frontend, and ESP32 sensor nodes over MQTT. Built the ESP32 firmware, designed the MQTT topic schema and a two-tier PKI (service + device CAs with short-lived device certs), wrote the Docker Compose dev environment and GitHub Actions CI, and scaffolded the backend and frontend. Self-hosted on a homelab with Komodo for deployments, Traefik for ingress, and Grafana + Loki for observability.

HTTP/1.1 library in C using only the standard library and POSIX. Wire-format request parser with incremental I/O for socket use, response serializer, and a case-insensitive open-addressing hashmap for header storage. Built against RFC 9110 and RFC 9112.

Fullstack habit tracking app built with SvelteKit, deployed on Cloudflare Workers with D1 (SQLite). Designed the REST API with Drizzle ORM, Zod validation, ETag caching, rate limiting, and atomic batch operations.

Python pipeline that fetches upstream ICS calendars, classifies events via configurable pattern-matching strategies, and outputs per-course tokenized feeds with template-based rewriting and ETag caching.

Bachelor's degree (2024–2027). Coursework in computer hardware engineering, data structures & algorithms, digital design, concurrent programming, and networks.

Design and deliver training programs for competitive youth sailors, focused on racing technique and tactics.

Maintained product master data quality in automated warehouse management systems. Automated repetitive data verification tasks to reduce manual processing time.

600 nautical mile race starting and ending in Helsinki

Race around Gotland island, Sweden's biggest yearly offshore race