Samuli Heljo Oy
Software services.
I'm Samuli Heljo, a freelance application, data and cloud engineering professional with 25 years of experience delivering digital solutions across the public and private sectors.
About
My core strengths include full-stack, data and cloud engineering and DevOps, backed by proven leadership and collaboration skills.
Throughout my career I've designed, built and run production systems end to end, from user interfaces and APIs through data pipelines to cloud infrastructure, CI/CD and operations. I stay hands-on and own the architecture and technical decisions.
Today much of my work centres on agentic software engineering: building with frontier LLMs and AI coding agents, and designing agent-driven workflows with solid testing, evaluation and engineering judgment kept in the loop.
Expertise
Agentic software engineering
Building software with frontier LLMs and AI coding agents. I design agent-driven engineering workflows where models plan, write, test and review code, with engineering judgment and quality control kept firmly in the loop.
Agentic workflows
Designing and building AI agents that automate real business processes. LLMs connected to your tools, data and APIs, with clear guardrails, evaluation and human oversight where it matters.
Full-stack web & mobile engineering
Modern web and mobile applications from user interface to backend services and APIs, built on the TypeScript, Node.js, Go, Rust, Python and React Native ecosystems.
Cloud engineering
Architecture and delivery on AWS and Google Cloud: serverless and container platforms, networking, security and scalable, cost-aware infrastructure.
DevOps & infrastructure as code
Automated delivery pipelines, containerised workloads and reproducible infrastructure defined in code.
Data engineering
Data pipelines, streaming and analytics platforms, along with relational and document databases.
Leadership & delivery
Agile project management, Scrum and Kanban, requirements and testing. I take projects end to end, from client relations and sales through to delivery.
Content platforms
Headless content management integrated with modern frontends.
Contact
Have a project in mind? Let's talk.