
Krzysztof Banaczyk
@krzysztofbanaczyk
Senior iOS Engineer at Big Blue Marble, improving tvOS apps and building real-time healthcare systems.
What I'm looking for
At Big Blue Marble, I maintained and customized tvOS applications for multiple clients, improving performance, stability, and user experience across product configurations. I also proposed and implemented technical and process improvements to development workflows.
Through Callstack, I designed and implemented reliability-critical real-time communication between Apple Watch and iPhone for medically sensitive biometric data synchronization. I’ve also delivered iOS products across healthcare, SaaS, and consumer domains, including a production e-learning product at Funmedia and NFC-based mobile payment experiences at NextApps.
Experience
Work history, roles, and key accomplishments
Senior tvOS Engineer
Big Blue Marble
Jul 2026 - Present (3 months)
Proposed and implemented technical and process improvements, enhancing development workflows and strengthening collaboration between UX/UI designers and engineering teams. Maintained and customized tvOS applications for multiple clients, improving performance, stability, and user experience.
Apple Watch Technical Lead | Senior iOS Engineer
Callstack
Jul 2023 - Apr 2026 (2 years 9 months)
Designed and implemented reliability-critical real-time communication between Apple Watch and iPhone for medically sensitive biometric data synchronization. Collaborated with US stakeholders and drove technical decisions around architecture, maintainability, release readiness, and compliance with regulated software quality processes.
Senior iOS Engineer
Codibly
Sep 2021 - Jun 2023 (1 year 9 months)
Led end-to-end delivery of iOS applications across commercial product initiatives, owning architecture, implementation, and technical decisions. Built advanced mobile experiences involving AR, UWB, BLE, GraphQL, and real-time connectivity.
Swift Mentor (Part-time)
OpenClassrooms
Sep 2017 - Jan 2023 (5 years 4 months)
Mentored 10+ aspiring iOS developers through a structured long-term mobile engineering program, providing technical guidance, code reviews, and architecture feedback. Helped developers build practical engineering skills across Swift, iOS architecture, and production-quality mobile development practices.
Senior iOS Engineer
NextApps
Mar 2019 - Jul 2021 (2 years 4 months)
Led end-to-end delivery of technically complex iOS product initiatives, owning architecture, implementation, and technical decisions. Built mobile payment experiences integrating with POS infrastructure through NFC and secure challenge-response communication.
Product Leader | Senior iOS Engineer
Funmedia
Jan 2020 - Mar 2021 (1 year 2 months)
Built and led delivery of a production mobile e-learning SaaS product from the ground up, owning iOS architecture, implementation, and technical direction. Recruited and technically led Android development, aligning architecture and delivery across the mobile product scope.
Education
Degrees, certifications, and relevant coursework
Wrocław University of Technology
Master of Science in Engineering, Engineering
2009 - 2014
Master of Science in Engineering degree from Wrocław University of Technology, completed in 2014.
Availability
Location
Authorized to work in
Salary expectations
Social media
Job categories
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