About
About
Andriy Oblivantsev — senior backend and data engineer in Santa Cruz de Tenerife, Spain (remote-friendly, CET).
Software since 2001 (IT apprenticeship in Nuremberg); 20+ years shipping web, GIS, data platforms, and self-hosted infrastructure. The through-line is the same problem in different eras: turn messy sources into reliable, observable systems — PHP/CMS and Flash client sites, Java/Oracle backends, Mapbender geoportals, Go/PostGIS marketplace search, Python/dbt CRM ETL (Dyvenia), and today Graph RAG + production voice on Matrix under produktor.io.
Contact: eslider@gmail.com · GitHub · produktor.io
Languages: English B2 · German C1 · Ukrainian C1 · Russian C1
Now (2025–2026)
Freelance via ProProdukt SL — own company, parallel to employment history above. Current build focus:
| Area | What | Read more |
|---|---|---|
| Knowledge RAG | Markdown → Neo4j + Qdrant → Matrix bot / voice | go-second-brain |
| Voice / WebRTC | Synapse, coturn, LiveKit, Jitsi — ~2 years production across 3 orgs | Matrix / VoIP |
| Agent delivery | Gitea issues → PR automation, Telegram | ai-fabric |
| Platform ops | k3s, OnlyOffice, Gitea, Ollama, Grafana/Loki | produktor stack |
| Go libraries | Config merge, OnlyOffice oo CLI, hOCR, Ollama clients | toolkit · go-config essay |
Writing: Go config: many good pieces, no whole picture (Medium, 2026-05-02) — why nested Go config needs an explicit map-in-the-middle; ties to go-config.
Repo inventory and metrics: Projects tab. Engagements with project links: Clients.
Career arc
| Period | Engagement | Focus | Story |
|---|---|---|---|
| 2025–present | Freelance (ProProdukt SL) | Graph RAG, WebRTC, agents, trading | produktor.io |
| 2024–2025 | Markets Platform (contract) | TradePlatform backend (~2k commits) | Markets Platform |
| 2023–2025 | Dyvenia (employee) | Python ETL — Atttiva/IDflow, FastAPI, dbt, CRM pipelines | Dyvenia · dyvenia.com |
| 2019–2021 | Immowelt AG (employee) | Go geosearch 80M+ addresses, AWS serverless | Immowelt |
| 2014–2018 | WhereGroup (employee) | Mapbender product — Digitizer, 1M+ users | WhereGroup |
| 2012–2013 | Keynote SIGOS (employee) | Java, Oracle/MySQL/PostgreSQL backends | SIGOS |
| 2006–2012 | GRID subcontractor | PHP/CMS via VisBack/VisCMS — 50+ client sites | GRID · gridfactor.de |
| 2006–present | ProProdukt SL (own company) | VisCreation → produktor.io — always parallel | VisCreation era |
Other client work: Pack und Cup (2016–2023) · Dreamteam HOCR (2022–2023) · Edelweiss healthcare (2025–present).
Technical skills
Languages
Go · Python · TypeScript/JavaScript · C#/.NET · PHP · Java · Kotlin · Bash · SQL
Data & pipelines
PostgreSQL/PostGIS · TimescaleDB · ClickHouse · DuckDB · Neo4j · Qdrant · Redis · Kafka · dbt · Parquet · Oracle · MinIO
Cloud & platform
AWS (Lambda, ECS, Fargate) · Kubernetes · Docker / Compose · Terraform · GitHub Actions · Linux · Azure (client work)
Observability
Grafana · Loki · Promtail · Prometheus · Sentry · n8n
Real-time voice / video
WebRTC · coturn (TURN/STUN) · LiveKit · Jitsi · Matrix VoIP / MatrixRTC · Element
AI & automation
RAG · knowledge graphs · Ollama · agent orchestration (AI Fabric) · OCR/hOCR · GDPR-aware handling
Web & GIS
React · Vue.js · Mapbender · WebGIS · Node.js
Education
- IT Specialist — Application Development (Fachinformatiker): IHK Nuremberg (2006) — apprenticeship at D2S/SYSTEMS (post, 2003–2006)
- Software Developer: BPS — Best Practice Strategies (2013)