Lead software engineer

Technical Leader, Software Architect, and Full-Stack Engineer

Staff Engineer specializing in distributed systems, cloud-native architecture, and full stack engineering. Over 15 years of experience designing, modernizing, and scaling high-availability systems that support national-scale operations. Proven track record leading cross-functional Agile and Waterfall teams, driving architectural strategy, and delivering reliable software in fast-moving enterprise environments.

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15+Years experience

CloudSystems and services

ArchitectureScalable and reliable

Full-stackFrontend to backend

AIAgentic systems

RoboticsAutomation and control

Featured work

Projects

A mix of professional systems, independent software, games, and coding demos.Systems, software, games, demos and more.

Selected case studies

A focused view of how I build.

These projects represent the range of problems I solve—from enterprise retail platforms and accessible scheduling to simulation software and games. Each case study emphasizes the decisions, integrations, and outcomes behind the finished work.

Additional public projects are available on GitHub. Much of my production work is proprietary, but I can discuss its scope, constraints, and my technical ownership in a professional conversation.

Propane Kiosks

Enterprise Platform

Built reservation and dispensing workflows for propane kiosks across 2,000+ Home Depot stores, integrating physical hardware with payments, accounting, and inventory state.

Overview Kiosk Demo Automated Exchange

Zippedi shelf-scanning robot inside a Home Depot store

Retail Vision Mapping

Vision Mapping

Enterprise Integration

Built the data-matching layer that connected shelf imagery from autonomous Zippedi robots to The Home Depot's store layouts and planograms, translating camera observations into physical aisle, bay, shelf, and product context.

Overview Bloomberg LíneaBloomberg Case Study

Accessible Scheduling

SaaS Web App

A scheduling platform for nurses and client care work. It reduced manual scheduling from roughly 10 hours to about 5 minutes while handling availability, travel, certifications, overtime, and client needs. Built with Angular, Spring, and MongoDB.

Overview Code

Multiverse Adventurers Guild

Publishing & Tabletop RPG

The first release from my independent publishing house: a setting-flexible tabletop roleplaying system with dynamically linked rules and a playable, locally saved character sheet. Built with ReactJS and TypeScript.

Overview New Site Code

SOPHIA

Molecular Dynamics Simulator

A Java desktop research application built for the Physics Department at the Georgia Institute of Technology. SOPHIA imports molecular models, runs molecular-dynamics and energy-minimization simulations, and provides interactive 3D playback and graphing for analyzing the results.

Overview Demo Code

Trial by Rotation

Game

A Unity game jam project about spinning tops battling in an absurd courtroom arena. Built in C# with Unity, WebGL support, custom AI, music, graphics, and more. Made for The Very Serious Juniper Dev Game Jam.

Overview Play The Jam Code

John Bieniek's Portfolio

Angular Web App

This responsive portfolio brings project case studies, interactive demos, and professional experience together in one Angular application. It uses server-side rendering, prerendered routes, reusable components, and production-ready social metadata.

Overview Code

Java Demo Site

Demo Lab

A technical demo site with runnable Java examples for algorithms, collections, streams, strings, records, enums, sealed interfaces, and backend-style utility functions. Hosted on AWS Elastic Beanstalk and built with Java, Spring, SQL, and GraphQL.

Overview Swagger UI Code

About

Engineer, builder, and problem solver.

I’ve worked on high-scale enterprise systems, independent SaaS-style software, creative technical projects, and games. I care about clean architecture, practical interfaces, stable systems, and software that people can actually use.

Outside of software, I build and repair things, work on a small homestead, play bass, make art in many mediums, and perform with various groups.

Enterprise systemsHigh-availability services, cloud platforms, reliability, modernization, and support.

Project managementLeadership, budgeting, hiring, accountability, mentoring, story creation, SLO definition, development, and execution.

Product ownershipRequirements, architecture, implementation, deployment, and iteration.

Broad knowledgeRetail, e-commerce, finance, healthcare, robotics, arts, and other areas of specialization.