Dylan Călin | Senior Python & Data Engineer

Technical Expertise

Core competencies across enterprise Python data engineering, resilient web crawlers, cloud integrations, and relational database architectures.

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High-throughput ETL pipelines, asynchronous data engines, schema modeling, and automated reporting.

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Headless browser crawlers for dynamic sites, with session handling, rate limiting and automatic recovery.

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Automated cloud CRM uploads, scheduled tasks, desktop robotic automation, and event-driven bots.

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Relational modeling, connection pooling, compound indexing, query execution profiling, and disaster recovery.

Institutional databases since 2020, freelance automation since 2022, and self-published apps since 2019.

Public-sector institution · Bucharest, Romania

Dec 2020 – Present

Administer the institution's relational databases (MySQL, PostgreSQL, Oracle, SQLite): schema migrations, query profiling and index tuning, scheduled backups and recovery, and security compliance.
Designed and built a Python ingestion and lookup engine (PyQt6 desktop app plus FastAPI service) that searches several departmental databases in one step, cutting manual lookup effort by ~85%.
Wrote parsers that turn unstructured operational logs and dispatch feeds into clean relational records, with validation and deduplication that keep schemas consistent across sources.
Built incident analytics (frequencies over time windows, geographic clustering, peak-hour detection) that feed auto-generated Word and Excel briefs for leadership, replacing manual report drafting.
Developed an internal Flask/MySQL web app for multi-criteria record matching and entity resolution across departments.
Designed and shipped the staff canteen app (Flutter client, MySQL backend) for reservations, portions and inventory: the only way staff order from the canteen, live on both stores.

Independent · Remote

2022 – Present

Built scrapers for 10+ social media platforms and other sites, tracking creator and competitor accounts to give clients the data behind their marketing strategy.
Deliver ETL pipelines that clean scraped data and sync it straight into clients' Airtable CRMs (REST API) and Google Sheets (service accounts, gspread).
Deploy and monitor scheduled workers on PythonAnywhere and Linux (cron, systemd) with error webhooks and log retention, so collection and reporting run unattended.
Built subscription Telegram bots: Reddit monitoring via PRAW with real-time channel alerts, PostgreSQL with connection pooling, and Stripe recurring billing.
Automated data extraction from legacy desktop software with no API (PyAutoGUI, Pandas) and parsed unstructured legal and administrative documents into structured tables and Excel deliverables.

Self-published · Apps Hub

2019 – Present

Took 6 apps from idea to the App Store and Google Play on my own: architecture, offline-first storage (SQLite, Drift), Supabase backend with Row-Level Security, RevenueCat subscriptions, store compliance and releases.
Live: GriLEX (exam prep for Police, Gendarmerie and MAI candidates), Popota (the institution's canteen ordering app), Grile TCO (1K+ downloads), Sensor Toolkit, Flip Rush, and Minesweeper The Original.
Built 30+ apps, utilities and games in total, including a deductive SAT solver that guarantees every Minesweeper board is solvable without guessing, and physics games built on Flame and Forge2D.

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