Pawel Kozielecki
Senior iOS Developer | Swift & SwiftUI
Salary / Daily rate
Gdańsk, Poland
Freelance
Can come onsite
Skills
Languages
About me
Intro
Senior iOS Developer and Tech Lead with 20+ years of architecting scalable mobile solutions. Demonstrated success creating high-performance apps with 90%+ test coverage for finance, gaming, and travel sectors while leading 100+ person engineering teams. Offering expert Swift/SwiftUI development, modern architectural patterns, and technical leadership that bridges business requirements with elegant implementations.
Work experience
Tech Lead, Mobile Applications
White Hat Gaming
Sep 2023 - Present
3 years 2 months
Remote, OR 97458, USA
- Architected and implemented a modular and scalable white-label casino iOS app with extensive configuration options, achieving over 90% test coverage. - Crafted an efficient, multi-brand application pipeline while ensuring zero regressions. - Developed a secure and robust geo-positioning module to ensure app compliance with iGaming and betting authorities. - Built a scalable cross-modular navigation framework that effectively managed complex UI scenarios.
Netguru
Nov 2019 - Aug 2023
3 years 10 months
Gdańsk, Poland
Mobile Software Architect (iOS)
Sep 2021 - Aug 2023
2 years
Gdańsk, Poland
- Maintained technical stack and architecture for 50+ mobile apps, ensuring optimal performance and scalability. - Led internal initiatives to enhance code quality, promote software craftsmanship, and establish best practices within a 100+ person mobile engineering department. - Technically led the development of high-profile iOS apps (Fintech, MedTech), ensuring their successful delivery. - Crafted and advocated for the adoption of a scalable, open-source, cross-platform Swift networking module with over 95% test coverage.
iOS Tech Lead
Nov 2019 - Oct 2021
2 years
Gdańsk, Poland
- Maintained technical stack and architecture for 50+ mobile apps, ensuring optimal performance and scalability. - Led internal initiatives to enhance code quality, promote software craftsmanship, and establish best practices within a 100+ person mobile engineering department. - Technically led the development of high-profile iOS apps (Fintech, MedTech), ensuring their successful delivery. - Crafted and advocated for the adoption of a scalable, open-source, cross-platform Swift networking module with over 95% test coverage.
Senior Software Engineer, Mobile Tech Lead
Lufthansa Systems Poland
Jan 2018 - Oct 2019
1 year 10 months
Gdańsk, Poland
- Managed mobile apps technical stack and architecture ensuring optimum performance and scalability. - Revamped legacy UAV tracking app architecture using modern iOS tech stack (Swift 4.x) to enhance configurability, performance, and battery life, achieving over 90% unit test coverage. - Developed a high-performance mapping tool capable of rendering 500+ geolocated vector shapes within one second, utilizing multithreading, smart caching, and predictive data loading techniques. - Built a secure, automated app CI/CD pipeline.
Co-founder, Technical Director
Two Goats Software LTD
May 2014 - May 2018
4 years 1 month
Derby, UK
- Architected, implemented, and deployed 10+ mobile, web, and desktop applications. - Conducted comprehensive discovery processes to understand client requirements, technical constraints, and business objectives.
Co-lead Mobile Software Developer, Team Pilot
AirHelp
Nov 2015 - Jan 2018
2 years 3 months
Gdańsk, Poland
- Modernized a legacy travel assistant iOS app by redesigning its architecture and migrating to Swift, enhancing scalability and performance while achieving over 80% test coverage. - Created a provider-agnostic user tracking framework to enable cross-platform session transfers and detailed conversion tracking, empowering data-driven decision-making. - Created an efficient, extensible boarding pass scanner that extracts flight information, reducing user friction and increasing compensation claim completion rates 10x.
Young Digital Planet
Nov 2008 - May 2014
5 years 7 months
Gdańsk, Poland
Senior Software Developer
Oct 2012 - May 2014
1 year 8 months
Gdańsk, Poland
- Successfully delivered 20+ native and cross-platform mobile applications, desktop applications, and websites. - Led internal knowledge-sharing initiatives for a team of 50+ people. - Mentored and guided junior developers in their professional development.
Software Developer
Nov 2008 - Oct 2012
4 years
Gdańsk, Poland
- Successfully delivered 10+ web and desktop applications. - Conducted client workshops to identify business needs and optimize processes.
Ph. D. Student and Researcher
Gdansk University of Technology
Sep 2007 - Dec 2008
1 year 4 months
- Participated in two EU and domestic research projects (including the EU FP7 INDECT program). - Implemented 3 web and desktop applications. - Published 3 research papers and presented at international conferences.
Front-end Developer
Wirtualna Polska
Feb 2007 - Oct 2007
9 months
Gdańsk, Poland
- Implemented website interfaces from provided design layouts. - Developed interactive web applications and features using JavaScript and Adobe Flash.
Front-end Developer
Albion Direct Ltd.
Jun 2006 - Oct 2006
5 months
Derby, UK
- Designed and implemented the company's website and online store. - Deployed workstation for high-quality art piece reproduction and prints.
Education
Gdańsk University of Technology
Master of Science (MSc)
2002 - 2007
5 years 1 month
Licenses & certifications
The Complete Prompt Engineering for AI Bootcamp
Issued: Mar 2025
Kotlin Multiplatform Masterclass - KMP, KMM - Android, iOS
Issued: Mar 2025
Prompt Design in Vertex AI
Issued: Feb 2025
LLM Engineering: Master Al, Large Language Models & Agents
Issued: Jan 2025
The Bubble Beginners Bootcamp Course
Issued: Jan 2025
Claude Mastery: Learn Prompt Engineering with Claude AI
Issued: Nov 2024
AI-Agents: Automation & Business with LangChain & LLM Apps
Issued: Nov 2024
Build Generative AI Apps and Solutions with No-Code Tools
Issued: Nov 2024
Hacking and Pentesting iOS Applications
Issued: Oct 2024
Communication, Leadership & Management - 3 in 1 Masterclass
Issued: Oct 2024
The Personal Development Mega Course (20 Courses In 1)
Issued: Sep 2024
17 in 1: Complete Personal Transformation Masterclass
Issued: Sep 2024
SELF-CONFIDENCE: Confidence & Self Esteem Guide
Issued: Jul 2024
Android Jetpack Compose: The Comprehensive Bootcamp
Issued: Jul 2024
The Complete Android 14 & Kotlin Development Masterclass
Issued: Jun 2024
10X SUPERHUMAN Learning: Speed Reading & Memory Booster
Issued: Jun 2024
The Complete Personal Development Course - 22 Courses in 1
Issued: May 2024
Listening Skills - The Ultimate Workplace Soft Skills
Issued: Mar 2024
iOS 17, SwiftUI 5, & Swift 5.9: Build iOS Apps From Scratch
Issued: Feb 2024
Async/Await and Actors - Concurrency in Swift
Issued: Jan 2024