Billie Heidelberg Jr.
Full Stack Developer | Educator | Team Leader
Hi, I'm Billie đź‘‹
I am a results-driven full stack developer and technical leader with 7+ years of experience building and scaling web applications. I specialize in React, TypeScript, Node.js, and cloud-native architectures. I have led teams of 5 to 8 developers and ship with a focus on performance, reliability, and user experience.
I am also an educator and have mentored 150+ developers through General Assembly’s Software Engineering Immersive. Teaching sharpened my ability to break down complex ideas, coach junior engineers, and collaborate closely with product and design. I care about building tools that make people’s lives easier and I value teams that lead with empathy and clear communication.
I am currently exploring full-time opportunities where I can contribute hands-on code, lead by example, and help teams deliver user-focused products at scale. If you are looking for someone who blends strong fundamentals with mentorship and impact, let’s connect.
Work Experience
Full Stack Engineer
Specialized social platform focused on safety, privacy, and inclusive discovery for an ENM and polyamorous community.
Key Achievements
- Implemented client-side distance filtering and a virtualized discovery grid for performant browsing
- Built Lambda@Edge SEO previews and integrated with CloudFront via CloudFormation
- Delivered global image caching and optimization, improving perceived load and reducing bandwidth
- Hardened the app with error boundaries, defensive checks, retries, and graceful fallbacks
Technologies
Technical Trainer
Designed onboarding and training for API and integration developers at a fintech platform serving large institutions.
Key Achievements
- Built developer onboarding programs covering ETL, data mapping, and integration workflows
- Created internal tools and documentation that reduced ramp-up time for new developers
- Supported production incidents and escalations across multiple financial clients
- Led workshops on REST API design, data quality, and troubleshooting processes
Technologies
Integration Developer
Developed integrations and data services for financial clients with a focus on quality and reliability.
Key Achievements
- Built ETL pipelines for transactions, holdings, and account data
- Developed RESTful services and contributed to relational schema design
- Partnered with QA and support to resolve production data issues
- Improved processing reliability with batch jobs and ACL generation scripts
Technologies
CTO and Co-Founder
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
Technologies
Software Immersive Instructor
Instructor and mentor for full-time software engineering bootcamps focused on modern full stack development.
Key Achievements
- Taught React, Node.js, Express, MongoDB, Python, and Django across multiple cohorts
- Guided 150+ students through intensive project-based learning and code reviews
- Created supplemental resources and labs aligned to industry practices
- Provided structured interview prep, portfolio reviews, and career coaching
Technologies
Front End Developer
Front-end development for financial services software, building responsive interfaces and client-facing digital solutions.
Key Achievements
- Developed digital solutions for 20+ financial institutions managing $500M+ in assets
- Created responsive interfaces serving 5,000+ daily active users
- Collaborated with cross-functional teams to deliver 12+ major product releases on schedule
- Participated in agile processes achieving 95% sprint completion rate
Technologies
Jr Front End Developer
Built interactive campaign pages and motion-driven ad experiences with tight performance budgets.
Key Achievements
- Developed HTML5 and JavaScript campaign experiences for major brands
- Optimized animations and assets for performance and reach
- Partnered closely with creative to hit brand and accessibility goals
- Delivered on fast timelines across concurrent campaigns
Technologies
Front End Developer (Contract)
Short term contract improving internal ambassador tooling and UX polish.
Key Achievements
- Refactored dashboard components to improve clarity and consistency
- Improved navigation and page structure for partner workflows
- Contributed fixes within a compressed delivery window
- Collaborated with product and design for smooth rollout
Technologies
Side Projects
Personal builds and experiments that inform my product thinking and engineering approach.
Smart Trader
January 2025 - Present
AI-assisted trading journal that helps traders log, analyze, and improve decision making with actionable insights.
- Built the full stack with Next.js, TypeScript, and Supabase
- AI-assisted trade reviews reduce manual analysis time for users
- Interactive charting for trade and performance insights
- Accessible UI with responsive layout and dark mode
Baby Tracker
August 2025 - Present
Privacy-first baby tracking API and app with self-hosting and data ownership focus.
- Designed multi-tenant API with Django REST Framework and Postgres
- JWT auth, OpenAPI docs, and Docker-based deployment
- Exploring AI-assisted routines and insights for sleep and feeding