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Hi, I'm William Henk—Senior Mobile Engineer with 7+ years of experience leading the design and development of high-impact mobile applications across SaaS, fintech, e-commerce, gaming, and logistics. I specialize in building cross-platform apps from the ground up using React Native, Flutter, Swift, and Kotlin, delivering production-grade iOS and Android experiences at scale. I’m passionate about integrating AI into mobile experiences, including LLM copilots, voice assistants, and creative AI for video, audio, and interactive content. I also have strong skills in cloud-native deployment (AWS, GCP, Azure), backend integration, and DevOps automation, and I focus on building performant, secure, and user-centric products that drive growth and engagement.…Hi, I'm William Henk—Senior Mobile Engineer with 7+ years of experience leading the design and development of high-impact mobile applications across SaaS, fintech, e-commerce, gaming, and logistics. I specialize in building cross-platform apps from the ground up using React Native, Flutter, Swift, and Kotlin, delivering production-grade iOS and Android experiences at scale. I’m passionate about integrating AI into mobile experiences, including LLM copilots, voice assistants, and creative AI for video, audio, and interactive content. I also have strong skills in cloud-native deployment (AWS, GCP, Azure), backend integration, and DevOps automation, and I focus on building performant, secure, and user-centric products that drive growth and engagement.

William Henk

Developer, Web Developer, Full Stack Developer, +3

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Hi, I'm William Henk—Senior Mobile Engineer with 7+ years of experience leading the design and development of high-impact mobile applications across SaaS, fintech, e-commerce, gaming, and logistics. I specialize in building cross-platform apps from the ground up using React Native, Flutter, Swift, and Kotlin, delivering production-grade iOS and Android experiences at scale. I’m passionate about integrating AI into mobile experiences, including LLM copilots, voice assistants, and creative AI for video, audio, and interactive content. I also have strong skills in cloud-native deployment (AWS, GCP, Azure), backend integration, and DevOps automation, and I focus on building performant, secure, and user-centric products that drive growth and engagement.…Hi, I'm William Henk—Senior Mobile Engineer with 7+ years of experience leading the design and development of high-impact mobile applications across SaaS, fintech, e-commerce, gaming, and logistics. I specialize in building cross-platform apps from the ground up using React Native, Flutter, Swift, and Kotlin, delivering production-grade iOS and Android experiences at scale. I’m passionate about integrating AI into mobile experiences, including LLM copilots, voice assistants, and creative AI for video, audio, and interactive content. I also have strong skills in cloud-native deployment (AWS, GCP, Azure), backend integration, and DevOps automation, and I focus on building performant, secure, and user-centric products that drive growth and engagement.

Available to hire

Hi, I’m William Henk—Senior Mobile Engineer with 7+ years of experience leading the design and development of high-impact mobile applications across SaaS, fintech, e-commerce, gaming, and logistics. I specialize in building cross-platform apps from the ground up using React Native, Flutter, Swift, and Kotlin, delivering production-grade iOS and Android experiences at scale. I’m passionate about integrating AI into mobile experiences, including LLM copilots, voice assistants, and creative AI for video, audio, and interactive content. I also have strong skills in cloud-native deployment (AWS, GCP, Azure), backend integration, and DevOps automation, and I focus on building performant, secure, and user-centric products that drive growth and engagement.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior Mobile Engineer at Variant Labs

October 1, 2024 - Present

Led the development of an AI-powered mobile game app using Flutter, integrating real-time voice, video, and character generation with HeyGen and Mubert, increasing player engagement by 20%. Built a cross-platform fitness app in React Native with real-time tracking, smart recommendations, and subscriptions, boosting user retention by 18%. Integrated LLM copilots and RAG-based assistants with Pollo and PixelLab.ai, delivering personalized AI-powered experiences that increased app engagement and user stickiness. Architected and deployed scalable backend services with AWS Lambda, DynamoDB, S3, and Firebase Functions, ensuring low-latency global performance. Implemented secure in-app purchases using Apple Pay, Google Pay, and Stripe, supporting over 50K monthly transactions. Optimized app performance by 30% via caching and rendering enhancements. Secured user data and payments with OAuth2, JWT, and custom anti-fraud protections tailored to mobile threats. Delivered products from ideation to

Mobile Engineer at Awesomic

September 1, 2024 - September 26, 2025

Developed cross-platform iOS/Android apps in React Native, enabling real-time project tracking, chat, and task workflows — improved client engagement by 30%. Built mobile-first collaboration features including push notifications, activity feeds, and async messaging — reduced turnaround time by 25%. Integrated backend APIs via GraphQL, PostgreSQL, and Redis, achieving <200ms response times across key mobile workflows. Implemented automated CI/CD pipelines using GitHub Actions, Docker, and Fastlane, cutting mobile release errors by 40%. Collaborated with founders, designers, and backend teams to define and execute the mobile-first product roadmap.

Full Stack Developer at DoorDash

February 1, 2022 - September 26, 2025

Built production-ready features across web and mobile platforms using React.js, Node.js, React Native, Flutter, and Kotlin. Optimized APIs using GraphQL, REST, and PostgreSQL, reducing average response time by 25% and improving app responsiveness. Improved checkout and order-tracking flows for mobile and web, increasing order success rates by 12% during peak traffic. Streamlined deployments with AWS Amplify, Docker, and Azure DevOps, boosting release efficiency by 30%. Helped design scalable systems to handle high-volume traffic and real-time orders with minimal latency.

Web Developer at H-E-B Digital

June 1, 2020 - September 26, 2025

Built internal tools using the MERN stack (MongoDB, Express, React, Node.js) to automate workflows and improve efficiency. Developed early mobile features with React Native (iOS) and Java (Android), enabling grocery ordering for 10K+ users. Collaborated with QA and product teams to ensure stable releases and minimize regressions in production environments. Contributed to feature planning, sprint grooming, and Agile ceremonies, helping the team deliver on-time product iterations.

Senior Mobile Engineer at Variant Labs

October 1, 2024 - Present

Led the development of an AI-powered mobile game app using Flutter, integrating real-time voice, video, and character generation with HeyGen and Mubert, increasing player engagement by 20%. Built a cross-platform fitness app in React Native, supporting real-time tracking, smart recommendations, and subscriptions — boosting user retention by 18%. Integrated LLM copilots and RAG-based assistants with tools like Pollo and PixelLab.ai, delivering personalized, AI-powered experiences that increased app engagement and user stickiness. Architected and deployed scalable backend services with AWS Lambda, DynamoDB, S3 and Firebase Functions, ensuring low-latency global performance. Implemented secure in-app purchases using Apple Pay, Google Pay, and Stripe, supporting over 50K monthly transactions. Optimized app performance by 30% via mobile-specific techniques including code splitting, caching, and rendering enhancements. Secured user data and payment flows with OAuth2, JWT, and custom anti-f

Mobile Engineer at Awesomic

September 1, 2024 - September 26, 2025

Developed cross-platform iOS/Android apps in React Native, enabling real-time project tracking, chat, and task workflows — improved client engagement by 30%. Built mobile-first collaboration features including push notifications, activity feeds, and async messaging — reducing turnaround time by 25%. Integrated backend APIs via GraphQL, PostgreSQL, and Redis, achieving <200ms response times across key mobile workflows. Implemented automated CI/CD pipelines using GitHub Actions, Docker, and Fastlane, cutting mobile release errors by 40%. Collaborated closely with founders, designers, and backend teams to define and execute the mobile-first product roadmap.

Full Stack Developer at DoorDash

February 1, 2022 - September 26, 2025

Web Developer at H-E-B Digital

June 1, 2020 - September 26, 2025