About Me
Get to know me
Sebastian Tekieli
CTO & Solo Dev with AI Team
I build autonomous AI systems that work while I sleep. My 19 years in tech (including 7 years as CTO scaling a team from 3→26 people at DataFeedWatch) taught me one thing: true scalability isn't bigger infrastructure, it's smarter automation.
As CTO, I focus on building scalable architectures and efficient development teams. My approach combines technical expertise with the ability to strategically plan and manage projects.
In the past, I founded and ran several technology startups, which gave me a unique perspective on product development and technology business management.
Our Experience
Over 20 years of experience building and scaling digital products for leading companies.
Trainer - Booking System
June 2025 - September 2025
Web-based training hall booking system for fitness studios. Platform enables external trainers to easily reserve time slots with capacity control. Features intelligent reservation validation system, automated monthly billing, and advanced calendar with real-time visual capacity indicators. Perfect for fitness studios and training facilities.
Learn moreTechnologies used:
Ruby on Rails 8, PostgreSQL, Hotwire (Turbo + Stimulus), Tailwind CSS, Redis Cache, Devise
EDK Shop
March 2025
Online store for Extreme Way of the Cross (EDK) built on PrestaShop. Implemented integrations with Apaczka.pl for shipping and InPost parcel locker selection. Orders are automatically synced from PrestaShop to Subiekt GT via Sybsync, triggering automatic invoice generation. Secure payment processing is handled via Przelewy24.
sklep.edk.org.plTechnologies used:
PrestaShop, PHP, MySQL, Apaczka.pl API, InPost API, Subiekt GT, Sybsync, Przelewy24 API
Yumio
December 2024
Mobile application for food recognition and diet management. Built using React Native and Expo, with TensorFlow.js for AI-powered food detection, Firebase for authentication, and comprehensive diet tracking capabilities.
Learn moreTechnologies used:
React Native, Expo, TypeScript, TensorFlow.js, Firebase, Redux Toolkit
EDK Donations
January 2024 - Present
Donation platform for Extreme Way of the Cross (EDK) with custom integration with Polish payment gateway Przelewy24. Built using modern web technologies, with a focus on user experience and secure payment processing.
wspieram.edk.org.plTechnologies used:
Next.js, React, TypeScript, Tailwind CSS, Przelewy24 API
EDK Routes
October 2023 - Present
Web platform for Extreme Way of the Cross participants providing route management and tracking capabilities. Developed frontend architecture using modern web technologies.
trasy.edk.org.plTechnologies used:
Next.js, React, TypeScript, Tailwind CSS
Punkta
May 2022 - Present
Online multi-agency insurance product platform. Leading the Ruby Competence Center as IT Director/CTO, conducting security audits, and managing development teams.
punkta.plTechnologies used:
Ruby on Rails, React, PostgreSQL
inFakt
November 2021 - April 2022
Accounting automation platform for entrepreneurs. Led implementation of Open Banking (PSD2) integration and managed the Ruby development team.
www.infakt.plTechnologies used:
Ruby on Rails, React, Open Banking API
Cominer.io
November 2018 - November 2020
Founded and developed an email discovery platform for lead generation. Built a simple yet powerful tool for finding and verifying email addresses by domain name, with an integrated email verification system.
Technologies used:
Ruby on Rails, React, PostgreSQL
DataFeedWatch
March 2014 - April 2021
Leading feed marketing solution processing millions of data points daily. Built and scaled the platform from the ground up, growing the technical team from 3 to 26 people.
www.datafeedwatch.comTechnologies used:
Ruby on Rails, Angular, AWS
GoTranslate.pl
October 2013 - October 2015
Founded and developed an online translation platform connecting clients with professional translators. Created a streamlined system for ordering, managing, and delivering translations with an automated workflow.
Technologies used:
Ruby on Rails, JavaScript, PostgreSQL
Interia.pl Group
February 2009 - February 2014
One of Poland's largest web portals. Led development of main sections including News, Jobs, and INTERIA.TV.
www.interia.plTechnologies used:
PHP, JavaScript, MySQL
RMF.FM
February 2011 - September 2011
Architect and developer for the RMFOn.pl platform. Responsible for setting up the development environment, technology consulting, and implementing key features including the admin panel.
www.rmf.fmTechnologies used:
PHP, JavaScript, MySQL
Onet.pl
September 2006 - January 2009
Leading Polish web portal. Developed and maintained multiple topic sites including the new homepage, Skype integration, and various vertical portals.
www.onet.plTechnologies used:
PHP, JavaScript, MySQL
DevOps & Cloud Infrastructure
Building scalable and secure cloud solutions
Cloud & Infrastructure
- AWS & GCP
- Kubernetes / GKE / OpenShift
- Terraform & Infrastructure as Code
- CI/CD (Jenkins, GitLab CI)
- Multi-cloud Environments
DevOps Tools
- GitOps Methodologies
- Ansible & Puppet
- Shell Scripting
- Python for Automation
- Large Language Models (LLM)
Security & Compliance
- Security Best Practices
- Compliance (GDPR, ISO 27001)
- Vulnerability Management
- Access Control & IAM
- Security Monitoring
Experience & Expertise
Seasoned DevOps Engineer with over a decade of experience architecting and managing resilient, cloud-agnostic infrastructures for complex sectors such as military, airlines, and banking.
Specializing in Kubernetes, Terraform, and CI/CD automation, focusing on creating scalable, secure solutions from blueprint to production. Leveraging GitOps methodologies to drive efficiency and automation across the development lifecycle.
Led process automation initiatives using Large Language Models (LLMs), streamlining workflows and enabling smarter, more efficient operations.
Certifications
References
See what people I've worked with have to say
Conference Talks & Meetups
Sharing knowledge and experience with the developer community
Build Mobile Apps the Rails Way
KRUG #4 2025
A presentation exploring Hotwire Native as a solution for building mobile applications using Ruby on Rails. The talk covers the challenges of mobile development, comparing native, cross-platform, and progressive web apps, and demonstrates how Hotwire Native enables Rails developers to build native mobile apps using their existing web development skills. Key topics include Bridge Components for web-to-native communication and real-world examples from production apps.
Our Technologies
We use cutting-edge technologies to create high-quality digital products that meet your requirements.
Programming Languages
Ruby
Elegant object-oriented language ideal for rapid web application development.
JavaScript/TypeScript
Modern languages for creating dynamic web and mobile applications.
PHP
Versatile scripting language used for creating dynamic websites and web applications.
Frameworks
React
JavaScript library for building interactive user interfaces.
Next.js
React framework for creating efficient web applications with SSR and SSG.
Ruby on Rails
Ruby framework for rapid web application development following "convention over configuration".
Frontend
Tailwind CSS
Utility-first CSS framework for rapidly building custom interfaces.
React Native
Framework for creating native mobile applications using React.
Expo
Platform and toolset for React Native, accelerating mobile app development.
Backend
Node.js
JavaScript runtime environment for building scalable backend applications.
Express.js
Minimalist web framework for Node.js to create APIs and server applications.
Ruby on Rails API
API mode in Ruby on Rails for creating efficient and secure backends.
Databases
PostgreSQL
Advanced SQL database management system with JSON support.
MongoDB
Non-relational document database, ideal for applications with dynamic schemas.
Redis
Efficient in-memory database, perfect for caching and session storage.
Transform Your Digital Vision
We create stunning websites and mobile apps that deliver real business results. From simple landing pages to complex e-commerce solutions, our expert team helps you stand out in the digital world.
Ready to start your project? Let's talk about how we can help you achieve your digital goals.