Billie Heidelberg Jr.
Full Stack Developer • Mobile Expert
Full Stack Developer • Mobile Engineer
I am a full stack developer, mobile engineer, and technical leader with 7+ years of experience building scalable web and mobile applications. I specialize in React, TypeScript, Node.js, and modern cloud-native architectures, with a focus on performance, reliability, and thoughtful user experience. I have led teams of 5 to 8 developers while remaining deeply hands-on in architecture, product delivery, and clean, maintainable code.
Alongside engineering, I have mentored 150+ developers through General Assembly's Software Engineering Immersive. Teaching strengthened my ability to communicate complex ideas clearly, support growing engineers, and collaborate closely with product and design teams. I bring a craftsman's mindset to building software and care deeply about creating tools that are both technically strong and genuinely helpful to users.
Today, I am focused on opportunities where I can contribute as a hands-on engineer, help shape technical direction, and build impactful products at scale. If you are looking for someone who blends strong fundamentals, leadership, and mentorship with a passion for shipping meaningful software, let's connect.
Work Experience
Full-Time Experience
Led full-time software engineering bootcamps, training aspiring developers in modern full-stack web development.
Key Achievements:
- Instructed 150+ students in full-stack development using React, Node.js, Express, MongoDB
- Designed project-based lessons emphasizing scalability and real-world application
- Mentored students 1-on-1 through portfolio projects and technical interviews
- Collaborated with instructional teams to evolve curriculum content
Leading provider of flexible and fully integrated digital applets for financial services. Promoted through four roles over seven years.
Key Achievements:
- Developed and maintained ETL pipelines for financial data transformation using PostgreSQL, MySQL, Python, and Groovy
- Designed and implemented SOAP and RESTful APIs and relational database models for enterprise-scale applications
- Built modular UI components and dashboards for client platforms, enhancing usability and accessibility
- Automated batch data workflows and integrations, reducing manual operations by 30%
- Trained 100+ developers across global teams in best practices and integration workflows
A major global advertising network known for award-winning campaigns.
Key Achievements:
- Developed interactive campaign pages and microsites using JavaScript, HTML5, and CSS3
- Collaborated with creative and UX teams to deliver pixel-perfect, responsive designs
- Implemented reusable components and animation sequences reducing development time by 20%
- Partnered with QA and production teams for high-profile brand campaigns
Freelance & Client Work
Comprehensive React Native mobile application and React admin portal for hair product discovery and community engagement. Delivered full-stack solution including mobile app, admin dashboard, content moderation, and partnership management.
Key Achievements:
- Built React Native mobile app with emoji reactions, community forum, and advanced user profiles
- Created React admin portal with advanced reporting, content moderation, and partnership management
- Implemented Firebase real-time features across both mobile and web platforms
- Developed comprehensive product catalog system with 3,500+ products and custom search
- Standardized UI components and modal designs across 200+ commits
- Integrated error logging system and real-time notifications
A social platform serving the non-monogamous and polyamorous communities.
Key Achievements:
- Engineered scalable discovery platform serving 2,000+ users with React, TypeScript, and Apollo GraphQL
- Designed and deployed AWS Lambda@Edge functions and CloudFront integrations for SEO performance
- Built global image caching pipeline using Sharp and S3, reducing bandwidth costs by 40%
- Developed event-driven architecture with Hasura event triggers and asynchronous job workers
- Integrated Twilio, Stripe, Mixpanel, and AWS SES for communication, payments, and analytics
- Managed infrastructure using Serverless Framework, Docker, and PostgreSQL
Modernized Airbnb's host ambassador platform with significant improvements in user engagement and support efficiency.
Key Achievements:
- Led full-stack modernization of host ambassador platform improving user engagement by 25%
- Implemented React components and Node.js APIs for enhanced platform functionality
- Optimized support workflows reducing response times and improving host satisfaction
- Collaborated with cross-functional teams to deliver scalable solutions
Full-stack e-commerce platform with Next.js frontend and Django admin portal for luxury fashion brand.
Key Achievements:
- Built responsive dark-themed UI with interactive product displays
- Implemented Django REST API for product management
- Created custom admin portal for client inventory management
Professional nonprofit landing page with community resources and mission-driven content.
Key Achievements:
- Designed responsive landing page with Next.js and Tailwind CSS
- Created mission-driven content sections for community engagement
- Implemented resource links and community initiative connections
Ventures & Co-Founded
Content discovery platform that promoted underground artists with engagement-focused ranking.
Key Achievements:
- Led full stack development with React, Node, and Postgres
- Prototyped engagement-based ranking to reduce popularity bias
- Owned sprints, backlog, and delivery in a lean environment
- Implemented authentication, creator onboarding, and feed performance improvements