Sergio.
Sergio Jimenez Jimenez

Senior Software Engineer · AI Enablement Sergio Jimenez Jimenez

Cloud-native data platforms, applied ML in production, and end-to-end product ownership.

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Currently
Pdftools (Smallpdf)
Based in
Basel, Switzerland
Building
Liftory

About

Senior engineer with ten years building production systems for regulated industries. At Pdftools I own the AI enablement platform, shipping Smart Redact (AI-based removal of personally identifiable information) and an OCR service for 180+ languages. Before that, I architected the Grand Solver at Swiss International Air Lines, a real-time cost-optimization system for Lufthansa Group flight operations.

References and certifications

What I do

Selected work

Liftory

2025 → present

An AI product I own end to end. Fitness tracking with an agentic GenAI chat worker. More than 100 registered users.

  • Founder and sole owner. Took the product from idea to Proof of Concept to a live app on the App Store and Google Play with more than 100 registered users, owning the roadmap, the release cadence, and adoption. Shipped an Ionic and Angular mobile app, native watchOS (Swift) and Wear OS (Kotlin and Jetpack Compose) companions with bidirectional phone-to-watch sync, a Next.js marketing site at liftory.ch, and a .NET 10 backend on PostgreSQL.
  • Built an agentic AI worker on the Microsoft Agent Framework (MAF) that designs personalized training plans through multi-turn conversations, calling domain tools over the Model Context Protocol (MCP) and grounding its answers with RAG over a curated fitness corpus. Orchestration is model-agnostic, with typed, schema-constrained tool calls. Applies the automated planning, reasoning, and NLP from my MSc in Artificial Intelligence.
liftory.ch

Selected experience

  • Pdftools (Smallpdf)

    Senior Software Engineer, AI Enablement

    Aug 2025 - present

  • Pdftools (Smallpdf)

    Senior Software Engineer

    Oct 2022 - present

  • Swiss International Air Lines (Lufthansa Group)

    Lead Engineer, Flight Operations Optimization (OPSD)

    Sep 2021 - Oct 2022

  • Swiss International Air Lines (Lufthansa Group)

    Software Engineer

    Jul 2019 - Sep 2021

  • Neueda

    Senior Software Engineer · Software Engineer

    Apr 2018 - Jun 2019

  • Wilken Software Group

    Software Developer

    Oct 2017 - Apr 2018
Full work history and education

Open source and earlier explorations

A procedurally generated planet rotating in the Godot editor

Procedural graphics

Procedural Planet

A real-time procedural planet generator. Layered noise shapes the terrain, a custom shader colours it by elevation, and gradient controls reshape an entire world as you adjust them.

Godot 3.2C#ShadersNoise
View on GitHub
A CHIP-8 game running on a phone screen

Emulator

CHIP-8 Emulator

A CHIP-8 virtual machine written from scratch in Flutter. A steady clock drives the fetch-decode-execute loop, so the classic 8-bit ROMs run natively on Android and iOS.

FlutterDartEmulation
View on GitHub
Sweetspot Android app login screen

Mobile, award-winning

Sweetspot

An Android and Android Wear app in Java, with user authentication and phone-to-watch synchronisation. It won the company's internal contest.

AndroidJavaAndroid Wear
View on GitHub
A game built in the course</> game dev

Teaching, free course

How to make games

A free, start-to-finish course I wrote on building cross-platform games with Cocos2d-x. Twelve chapters take you from an empty project all the way to shipping on Android.

  • Setup
  • Sprites
  • Animations
  • Input
  • Collisions
  • Audio
  • Menus and UI
  • Ship to Android
Cocos2d-xC++Spanish
Open the course

Credentials and references

Verified certifications, university degrees and a professional reference. Documents shared on request.

Certifications

Documents

  • Reference letterSwiss International Air Lines
  • MSc Artificial IntelligenceUniversidad Internacional de La Rioja (UNIR)
  • Master's, Mobile Applications DevelopmentUniversitat Oberta de Catalunya (UOC)
  • BSc Computer ScienceUniversity of Oviedo
Download CV (PDF)

Get in touch

Let's build somethingreliable.

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English · C1Spanish · NativeGerman · A2 / B1