Open to opportunities

Mike Marciniak

@mikemarciniak

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Senior React Native engineer passionate about building magical mobile experiences.

United Kingdom

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What I'm looking for

I am looking for opportunities in innovative projects that benefit others, with a focus on collaboration and strategic development.

I am a Senior React Native engineer with a strong focus on creating magical mobile experiences and scaling systems. My journey in mobile development has been marked by a commitment to building reliable applications, utilizing native components, and ensuring data security. I have extensive experience in translating Objective-C to Swift and vice versa, and I am proficient in both Expo and pure React Native setups using TypeScript.

Throughout my career, I have contributed to various projects, including decentralized crypto exchanges and centralized wallets, where I played a pivotal role in mentoring junior developers and enhancing user experiences. My responsibilities have ranged from building KYC flows to implementing feature flags and A/B testing, all aimed at improving user retention and satisfaction. I thrive in collaborative environments, working closely with product and design teams to bring innovative ideas to life.

In addition to my technical skills, I have a passion for projects that benefit others and a keen interest in clear strategic planning. I enjoy the challenge of working in diverse industries, including music, automotive, and finance, and I am always eager to learn and grow in my field.

Experience

Work history, roles, and key accomplishments

Game Engine Developer

Loud Beings

Oct 2024 - Mar 2025 (5 months)

Developed a JavaScript-based game exploring John Lennon's Dakota apartment through text commands. Integrated a custom API for dynamic game setup and a Spotify integration responsive to game progress.

JavaScript Game Development API Integration Spotify API Playtesting

Senior React Native Engineer

Token.com

Oct 2017 - Aug 2024 (6 years 10 months)

Built two major applications, Monolith (a decentralized crypto exchange) and token.com (a centralized wallet with video feed capabilities). Led hiring, mentoring, and architectural responsibilities including KYC flow, login systems, and video feed optimization.

React Native TypeScript Mobile Development Cryptocurrency KYC A B Testing User Retention Mentoring

React Native Engineer

Connected Space

Feb 2016 - Jul 2017 (1 year 5 months)

Developed an application connecting to an ODB (on-board diagnostics) device in cars to stream relevant data. Implemented geo-fencing for push notifications and designed custom graphs with animations.

React Native Push Notifications Animation Mobile Application Development

Javascript Developer

Betway

May 2013 - Jan 2016 (2 years 8 months)

Primarily developed casino games using ActionScript and JavaScript for publication on App Store and Play Store. Contributed to the development of betway.com, gaining experience with Angular and basic C#.

JavaScript ActionScript Game Development Web Development Angular C Mobile Gaming App Store Deployment

Mobile Web Developer

We Love Mobile

Feb 2011 - Apr 2013 (2 years 2 months)

Developed several mobile websites to promote various clients, including Coca-Cola, Nintendo, Peugeot, and Nestea. Gained foundational experience in mobile device compatibility and web development.

Mobile Development HTML CSS JavaScript Client Promotion Responsive Design

Education

Degrees, certifications, and relevant coursework

University of Greenwich

B.Sc., Web Technologies

Completed a Bachelor of Science in Web Technologies, focusing on the principles and practices of web development. Gained foundational knowledge in various web technologies and programming concepts.

Tower Hamlets College

Certificate, Web Design

Studied web design principles and techniques, gaining practical skills in creating and developing web interfaces. Focused on foundational aspects of visual design and user experience for the web.