Lef Filippakis

I keep ending up building the same thing: the developer-experience layer on top of a complex platform, so other engineers ship safely and fast. Four roles, same pattern.

At Filed today (AI tax prep for CPA firms), I'm Principal engineer across infrastructure, AI platform, and backend. Three pieces of work I'd point to first: an agentic production-triage service tied behind a Slack-bot interface that consolidates logs and databases into a conversational DevEx (sandboxed, read-only, network-policied); reusable GitHub Actions workflows for LLM-powered PR review adopted across the org; and a multi-region Gemini load balancer that moved productionrate-limiting from workflow-blocking to non-event.

Before that at Visa, I built Ratchet: an internal MLOps framework that bundled IaC, a CLI, and CI/CD into a single Python tool. Data Scientists shipped regulated-industry ML to GCP Vertex AI through a transparent framework, maintaining a YAML config while GitHub Actions handled the rest. Service standards, deploy-and-rollback discipline, and observability defaults baked in. I gave two public talks on the design at NDSML Summit and the Stockholm MLOps Community meetup.

Earlier at Northvolt, I built the company's most-used internal Python library: a multi-backend data-access SDK across Redshift, ElasticSearch, S3, PostgreSQL, Timescale, and Athena. Daily-driver for 30+ engineers; organic adoption beyond the original team with feature requests; production-line incident debugging on the factory floor. I grew the team from 1 to 5 and founded the internal data community (0 to 100+ engagedemployees per month).

What I'm looking for: fully-remote Senior, Staff, Lead, or Principal IC roles.

Strong-fit profiles: AI-infrastructure platforms (Modal, Grafana, Databricks-shape), developer-experience teams, agentic-systems work, observability craft. Python-first (advanced async, libraries with broad userbases), TypeScript, Go (working).

Outside the dayjob: MSc in Complex Adaptive Systems and Engineering Physics from Chalmers; NordSec 2018 publication on predicting real-world software exploits; Arcturus, a browser-based virtual analogsynthesizer built ~95% by Claude Code agents in an autonomous loop I designed; Tibberios, a home-energy management tool on GitHub.