Eight years helping an EdTech platform grow to more than ten million users. Then an agency-built product takeover and LLM pipelines in production.
I get up to speed quickly in existing codebases and take ownership through production.
"Borut delivered immediate value after joining our team." Selected organisations I've worked with
Direct long-term engagements with Edukey and TES Global; the rest delivered as the engineer on projects contracted through partner agencies.
Most recent first, back to my eight years on ClassCharts.
An AI tutoring and exam-preparation platform used by more than 13 million secondary-school students across web, iOS and Android. I replaced message-count entitlements with cost-based usage metering across every plan tier, built the AI tutor's memory pipeline, and added credit top-ups with the usage administration interface.
Took over an agency-built investment-intelligence platform covering 20+ global markets. Worked hands-on across the application, AI layer and infrastructure, alongside colleagues in frontend, backend/data APIs and design. The company wound down in March 2026.
Backend engineer on a smart-city programme where several vendor teams built five city domains at the same time. I designed and built 20+ microservices on Kubernetes and the event-driven layer from the IoT gateways inward, on Kafka and Cassandra. The C4 architecture models I made from the specifications became the reference the vendor teams built against.
Joined as the first developer alongside the CTO and stayed through the growth of ClassCharts from hundreds of thousands of users into a platform serving more than ten million pupils, parents and teachers across the UK education system, and through its acquisition by TES Global. The scope moved with it: building the product, then rebuilding the web app from jQuery to React in place, then taking mobile from an Android-only native app to React Native on both platforms, then the infrastructure through Rackspace, GCP and AWS, then onboarding the teams that arrived with the acquisition.
" I worked with Borut for 8 years, he was our longest serving developer and he was an excellent person to work with. Borut always feels & displays a high level of responsibility to the project and the team and brought immense value to what we were trying to achieve, he understood our vision & grew with our codebase to become a hugely valued developer who you could rely on & would always deliver. Time keeping, attention to detail & working with others were never a problem. Borut worked on each of our products, working with different team members, platforms and codebase & responsibilities. I have zero hesitation in recommending Borut as he is an intelligent & hard working individual with a good sense of humour and liked by the rest of the team - he was a huge asset! " " Borut delivered immediate value after joining our team. He brought clarity to complex problems, unlocked efficiency, and significantly increased throughput. He quickly identified mission-critical technical debt and resolved it on schedule. Borut communicates clearly with both technical and non-technical stakeholders and consistently connects technical concepts to practical business goals. His experience enables him to leverage AI to accelerate delivery without compromising quality. We were fortunate to have him on board and would gladly collaborate with him again or recommend him for any project. " I join an engineering team for the long term and work directly with you.
Senior Software Engineer, including full-stack and product engineering roles, or a hands-on Technical Lead. I get to know your codebase and work with your team to deliver and maintain production software. EU employment or a long-term B2B contract, remote-first.
Employment & Career →My last client engagement ran from April to June 2026, on an AI tutoring platform used by millions of students. Since July I have been building my own software products and AI-assisted engineering tooling; once I join a team, that work carries on in my own time or pauses.
A guest-engagement platform for independent hospitality venues, replacing the patchwork of reservation widgets, menu PDFs, mailing tools and paper loyalty cards most of them juggle. I chose the domain, designed the product and built all of it: multi-tenant operator app, public property pages, API, background workers and the guest portal that closes the loop after a visit. Live in beta.
guestavo.com →
I have coded with AI every day for several years now, on client work as much as my own: Tabnine first, then Cursor, then Claude Code a couple of weeks after it came out, and Codex alongside it now. The part that matters is the harness around them rather than the prompting. Versioned workflow definitions with a gate and a model tier per phase, MCP servers that let agents read and write real project state instead of guessing at it, and a hard rule that nothing public ships without a human reviewing it. Guestavo was built on tooling I wrote myself.
Read how it works →Beyond the products above: data and pipeline work, desktop and productivity apps, and open source - all outside client work, all where I owned the architecture as well as the code.
A personal platform that takes in around 100,000 financial news articles a day from 5,000+ feeds, newsletters and archives and lines them up against real-time market prices. An event-driven pipeline on BullMQ and RabbitMQ moves each article through self-hosted models for embeddings, clustering, entity recognition and sentiment, and into storage split by job: PostgreSQL, ClickHouse, Meilisearch, Qdrant and Redis.
A desktop app for real-time voice transcription, built in Rust with Tauri and shipped for macOS. Multi-provider by design (Soniox and OpenAI in the cloud, Ollama locally) behind a bring-your-own-key model, with a floating overlay for live feedback and a transcription history with saved audio. Audio capture, streaming and native desktop integration in one, which is a very different set of problems from web work.
An open-source all-in-one productivity platform: calendar, tasks, habits, notes, focus sessions and mood tracking in one product rather than six separate tools. Full ownership end to end - data model, API, web client and deployment - which is really an exercise in keeping six interlocking domains coherent in a single codebase.
Contributor to Babylon.js, the open-source WebGL 3D engine maintained by Microsoft and used by thousands of developers. Contributions upstream into an engine that size mean working to someone else's review standards and API constraints, which is a useful counterweight to owning every decision on your own projects.
These are just highlights. The full list spans educational platforms, energy management systems, IoT infrastructure and more open source work.
View All ProjectsI started coding in 2004 with plain HTML sites. The work that shaped me most was eight years inside one EdTech product, ClassCharts: from the first developer hire to a platform with more than ten million users, through a jQuery-to-React rewrite, two generations of React Native apps and three cloud migrations. What teams say they value is that I take ownership, communicate honestly about tradeoffs, and stay with a system long enough to be accountable for it.
These days I work mostly in TypeScript, React, Node.js, PostgreSQL and Python on Docker and Kubernetes, across product code, data pipelines and infrastructure. I have shipped LLM-backed features in production: classification pipelines, alerting and search.
Outside work: motorsport (hence WeWentCarRacing), DJing, and the occasional contribution to a 3D engine.
Open to a long-term engineering role, employed or on a B2B contract.
Send the role description with your stack and timing.
My client work has been contracted B2B through Corco Labs, because most of my clients were abroad and could not employ me in Slovenia.
Senior Software Engineer