Csongor Keller

Available to hire

As a Freelance Full-Stack Software Engineer and former CTO, I am passionate about building scalable platforms, distributed systems, and impactful user experiences.

About

As a Freelance Full-Stack Software Engineer and former CTO, I am passionate about building scalable platforms, distributed systems, and impactful user experiences. With a strong foundation in software engineering, AI, and leadership, I bridge business needs and technical execution across diverse industries—from insurance and telecom to real-time media and deeptech AI.

I specialise in designing and managing high-performance systems, mobile and web applications, and machine learning pipelines.
I thrive in fast-paced environments and enjoy mentoring cross-functional teams while driving product innovation from ideation to launch.

Hard skills: NodeJS, Python, Flutter, JavaScript, AWS, GCP, AI/ML, Agile/Scrum and many more

  • Joined July 2025

Languages

  • EnglishFluent
  • HungarianFluent
  • GermanIntermediate

Industry experience

  • Software & Internet
  • Professional Services
  • Government
  • Education
  • Transportation & Logistics
  • Telecommunications
  • Financial Services
  • Media & Entertainment

Projects · 8

Flutter app — complete design and full development for Android and iOS.

  • App Developer
  • Back-End Developer
  • UX Designer

Create custom routes to discover hidden gems along your ride. Simply mount your device on your bike and enjoy the adventure. Available on Android and iOS.

  • App Developer
  • Back-End Developer
  • UX Designer

Need a Break is your go-to companion for breaking out of negative thought loops — offering small, thought-provoking challenges to shift your focus and reset your mind.

  • App Developer
  • Back-End Developer
  • UX Designer

Stress, anxiety, and panic attacks can disrupt daily life — but you don’t have to face them alone. Rootd offers guided meditations and practical tools to help you stay calm and in control, right from your pocket. Available on Android and iOS.

  • App Developer
  • UX Designer

A unique platform designed for co-living communities to share events, stay updated with news, and build their own social environment. Available on Android and iOS.

  • App Developer
  • Back-End Developer
  • UX Designer

Students can instantly enroll in classes, watch video materials, download articles, chat, post, share content, and more — all in one place. Tutors can upload videos, share learning materials, and answer student questions in real time. Available on Android and iOS.

  • App Developer

Work experience· 5 roles

CTO · Syntric AI - NetherlandsDec 2023 – Jul 2025 · 1 yr 8 mos

At Syntric AI, we generated 3D-based synthetic datasets to enhance the face recognition systems of our clients (border control, law enforcement, VR/AR). As the CTO, my responsibilities included developing a distributed data generation pipeline, synthesizing photorealistic facial expressions, hair, lighting, reflection changes, aging, and area-based mesh morphing variations among virtual humans to create diverse facial structures. Additionally training facial recognition AI models for data validation (VGG16 and AdaFace). Building a hyper-scalable infrastructure management pipeline with auto-scaling capabilities and custom alerting integrations. This system operated on cloud platforms such as AWS and GCP, managing over 50 GPU instances concurrently and dynamically adjusting resources to optimize cost-efficiency and rendering speed. Leading a cross-functional team of artists, software, and AI engineers, implementing agile processes. I built a product team from zero to four 3D artists, two

CTO · Octopus Visuals - NetherlandsDec 2021 – Jul 2025 · 3 yrs 8 mos

Octopus Visuals operated as a boutique web and mobile development agency with a core focus on enhancing the online presence of businesses struggling with limited visibility. As the CTO and lead developer my duties were: Frontend development in React and Flutter for web, Flutter native app development for Android and iOS, iOS native app development, Backend development in Laravel, NodeJS, and Python. Some of my projects: IPTV-EPG: IP-TV streaming native app for iOS and Android, XClass: Video-based learning native app for students in Ghana, HULI: Routing and navigation native app for cyclists in the UK, Dynalogic: Warehouse scanning native app for faster parcel deliveries, ItsCoastal: Luxury yacht and property rental platform in CA (app + web app) and many more.

Mobile and webapp development manager · Generali Insurances - HungaryDec 2019 – Jul 2025 · 5 yrs 8 mos

During my time at Generali, I led both the maintenance and development processes for customer-facing native apps and admin panels. My duties were: ensuring a high level of user-friendliness as output in the implementation of features for both native apps and customer-facing admin panels; focusing on customer needs while developing the online contract management system; overseeing the development of native applications; writing clear specifications for UX design and development teams, thoroughly testing and documenting any issues; actively participating in the planning of native apps and websites; contributing to the company's efforts in going more and more digital; maintaining the online analytical system and channeling insights back to the development.

Project manager, Scrum master · Angry Bytes / Ex Machina Group - NetherlandsDec 2019 – Jul 2025 · 5 yrs 8 mos
Data scientist · Planet of the Apps mobile agency - HungaryDec 2018 – Jul 2025 · 6 yrs 8 mos

Education

Bachelors in Electrical Engineering · Obuda University - Budapest2016 – 2018

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