Aleksi Heinonen

Technical founder & full-stack engineer · MBA

I design and ship production systems end to end.

AI agents, Rust infrastructure and IoT platforms — architecture, code, tests, infrastructure and launch, delivered by one engineer. Every claim on this site is measured.

Available for contracts from October 2026 · remote or Tallinn / Helsinki

Start a project → See the work

Portrait of Aleksi Heinonen
Tallinn, Estonia
5
complete systems built end to end, from hardware to cloud
900k+
lines of code across Rust, TypeScript, Python, C# and C
7,300
transactions per second measured on my own Rust blockchain
EN · FI
working languages, including production voice AI in Finnish

Selected work

Systems I have designed, built and run

  1. 01 A sharded proof-of-stake blockchain in Rust A DAG-based layer-1 designed for agent-to-agent payments: consensus, execution, sharding, proving, SDKs, wallet and explorer — built from scratch. Distributed systems · Rust 2026 7,300 TPS measured, 2 shards × 2 validators, exact supply conservation
  2. 02 Finnish-language AI phone agent for electricity utilities An AI agent that answers fault-report calls in Finnish, turns them into structured fault reports and connects to the utility's on-premise outage system. Voice AI · B2B SaaS 2026 300k lines of TypeScript across backend and frontend
  3. 03 Autonomous AI marketing crew with its own video studio A team of AI agents led by an AI director that plans, writes, produces long-form video and publishes across social media — with compliance checks and a human in the loop only where it matters. Multi-agent AI · Content automation 2026 10 specialised agent roles, coordinated by an AI director
  4. 04 IoT energy and machine-health platform, from circuit board to cloud Sensor hardware, firmware, gateways, automated control and a machine-learning analytics platform that learns how rooms and machines behave, cuts energy use and predicts maintenance needs. Embedded · IoT · Machine learning · End to end 2022–2026 6 analytics layers, from raw telemetry to maintenance recommendations
  5. 05 Evidence-based health platform with an AI assistant A consumer health platform with cited long-form articles, condition guides and an AI chat grounded in the platform's own reviewed content. Full-stack · AI · Content 2026 268k lines of application code (backend and frontend)

Services

What I can build for you

01

AI agents and automation

Voice agents, multi-agent crews and content pipelines wired into real business systems — with guardrails, approvals and audit trails.

02

Product builds, end to end

From architecture to a running SaaS: backend, frontend, billing, infrastructure as code, CI/CD and monitoring.

03

IoT, control and machine learning

Sensor hardware, firmware and gateways through to control algorithms and ML analytics that predict maintenance.

04

Rust and distributed systems

High-throughput services, consensus and cryptography, with property tests, fuzzing and formal specifications.

How I work

Fast, without cutting corners

  1. Plan A written plan and acceptance criteria before any code.
  2. Build Small, reviewed increments with tests from day one.
  3. Measure Performance, cost and errors tracked, not guessed.
  4. Hand over Documentation and infrastructure as code, so your team owns the result.

Contact

Have a system to build?

Contract, fixed-scope project or technical rescue. Tell me what you need and by when.

hello@aleksiheinonen.com

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