Peter Sjolin

Senior Software Engineer with 20+ years of experience building production systems across fintech, real estate, blockchain, and high-scale marketing platforms. Over the last 6+ years I’ve specialized in Go, designing secure, low-latency backend services, distributed systems, and API-driven architectures deployed with Docker and cloud infrastructure. I’ve built and operated end-to-end systems including: • A production ledger and blockchain indexer in Go (ETH, MATIC, USDC) with reconciliation logic and full API test coverage • High-throughput marketing SMS infrastructure sending millions of messages per day • A Rust-based DEX arbitrage bot performing large-scale token comparisons • Solidity smart contracts (flashloans, escrow, NFTs, zk-SNARK integrations) deployed and tested with Foundry • JWT-secured, wallet-authenticated web platforms using IndexedDB + Web Crypto for secure client storage I’m comfortable owning projects from schema design and cryptography decisions through CI/CD, Docker Compose, cloud deployment, monitoring (Prometheus, Datadog), and production debugging. Security, encryption, and data integrity are recurring themes in my work (AES-256-GCM, HMAC indexing, key management, reconciliation systems). I’ve worked extensively in fully remote environments and prefer senior backend or protocol-level roles where I can design systems, lead architecture decisions, and build reliable, scalable services in Go or Rust. I’m especially interested in distributed systems, blockchain infrastructure, fintech platforms, and developer tooling.