
Hi! I'm Zack.
I'm a full stack developer and life-long learner with a deep passion for problem solving and tech. With a rich background in the music industry, working alongside artists and music labels, I've transitioned my creative mind and audio engineering skills into the world of software development. When I'm not at my computer, I like to spend my time learning Japanese, keeping fit and producing music.
Experience
Zack Hanni
Software Engineer
I build exceptional and accessible digital experiences for web and mobile.


Senior Software Engineer
Leadr
August 2025 - Current
Senior engineer contributing to Leadr’s core employee development platform—software used by managers and organizations to improve communication, track performance, and identify strengths and gaps across teams.
- Collaborate across product, design, and engineering to deliver high-impact features that improve organizational engagement, performance tracking, and leadership development workflows.
- Built and maintained complex front-end interfaces using React, TypeScript, and Emotion CSS, ensuring accessibility, performance, and design fidelity from Figma specifications.
- Designed reliable client–server integrations leveraging Node.js, REST APIs, and TanStack Query to optimize caching, reduce network load, and improve perceived performance across the application.
- Partnered with backend teams to refine API contracts, resolve data shape inconsistencies, and improve resilience across distributed services.
- Improved developer workflows by contributing reusable components, shared utilities, and documentation that raised team velocity and consistency.
React Developer w/ Node.js
Fedstack, Leidos
May 2025 - July 2025
Engineered a mission-critical Single Page Application (SPA) for the Federal Aviation Administration (FAA), enabling real-time flight path monitoring, route editing, and safer airspace management.
- Built advanced geospatial mapping capabilities using React Leaflet, GeoJSON, and Polylines to render dynamic aircraft positions and projected trajectories.
- Engineered a real-time Reroute Tool supporting interactive route creation, conflict detection, and airspace validation.
- Led a state management migration from React Context to Zustand, significantly improving performance and reliability.
- Simulated real-time aircraft movement using interval-based coordinate updates with optimized rendering.
- Resolved complex rendering defects including event propagation issues, race conditions, and stale state synchronization.
Full-Stack Developer | React Native Developer
Smart Mark
August 2023 - April 2025
Led full-stack development across mobile, web, and IoT platforms using React Native, Next.js, Node.js, Supabase, and AWS.
- Developed a React Native IoT Smart Home App integrating SmartThings and Home Assistant APIs to manage and automate 100+ smart devices.
- Implemented a real-time data processing server using Node.js and Apache Kafka, powering high-throughput event consumption and REST API exposure.
- Built a lightweight CRM solution with Next.js and SQLite, including OAuth 2.0 authentication via Microsoft Identity Platform.
- Created a location-based mobile quiz experience for 500+ users, integrating analytics for engagement tracking and automated prize workflows.
- Maintained and deployed 16+ production websites using AWS and GoDaddy, improving stability through automation and performance optimizations.
Front-End React Developer
Sounds Like Soma
January 2018 - August 2023
- Designed and developed custom web applications for music labels and studios using React, Ruby on Rails, and Jekyll.
- Created reusable press kit templates in React, adopted by 20+ artists and labels, with global deployments through Vercel.
- Managed over 50 TB of multimedia content across multiple studios, implementing secure archiving and retrieval systems.
- Rebuilt the studio’s primary website using Rails, Jekyll, and Bootstrap, driving 5+ years of consistent SEO growth.
Side Projects
About
🌱 How It Started
My journey into software began with late nights on Codecademy, the guidance of a patient mentor, and hands-on learning through freelance gigs. Things took off at Sounds Like Soma, a Philadelphia-based recording studio, where I managed the studio’s website and IT infrastructure. There, I had the unique opportunity to collaborate with global recording artists and record labels—designing promotional landing pages and crafting dynamic electronic press kits that helped bring their stories to life.
👨💻 Where I Am Now
Most recently, I served as the lead full-stack web and mobile developer at a Philadelphia-based PR agency. The role challenged me to constantly explore new technologies—from real-time data processing and IoT integrations to modern frameworks like React Native and Next.js. It pushed me to grow not just as a developer, but as a creative problem-solver and collaborator.
🔍 What I'm Looking For
In my next chapter, I'm looking to join a team of curious, motivated professionals building software that has a real-world impact. I thrive in environments that value continuous learning, shared knowledge, and thoughtful engineering. If you're building something meaningful—and need someone who can turn bold ideas into functional, scalable products—I'd love to connect.
Drop a line
This website was designed in Figma, coded in Visual Studio Code, built with Next.js, and deployed with Vercel by yours truly.








