Software · Web · AI Dev

Senior engineering for businesses that need it done right.

Two decades architecting enterprise systems, leading cross-functional teams, and translating ambitious business goals into working software. Now offering bespoke development and AI integration strategy from a small, senior-led studio on Long Island.

20+
Years engineering enterprise software
10+
Years pre-sales engineering
F500
Trusted advisor to Fortune 500 clients
3×
Continents · cross-functional teams led
Services

Three practices, one senior engineer.

Every engagement is led personally — not handed off to junior staff. From architecture decisions to the last line of code, you work with someone who has delivered at scale and sold to the C-suite.

01 — Software

Software Engineering

Enterprise-grade applications, internal tooling, mobile platforms, and the architecture decisions that hold them together. Polyglot across the modern stack.

  • Full-stack web applications
  • Mobile development (Android / cross-platform)
  • Custom SDKs & API design
  • Legacy modernization
02 — Web

Web Development

Performant, conversion-focused marketing sites, product UIs, and complex web applications. Built to last — accessible, fast, and maintainable.

  • Marketing & brand sites
  • Product dashboards & SaaS interfaces
  • E-commerce & CMS integrations
  • Performance audits
03 — AI

AI Consulting

Strategy and implementation for businesses figuring out how AI actually fits — without the hype. RAG pipelines, document intelligence, agentic workflows, and honest assessments of what's worth building.

  • LLM strategy & use-case discovery
  • RAG & document intelligence pipelines
  • Generative media workflows
  • AI-assisted development adoption
Approach

How the work gets done.

A small, senior-led process refined over twenty years of building software. No layers, no theater — just clear scope, frequent demos, and code you can actually maintain.

01

Discovery & framing

+
A working session — sometimes a single call, sometimes a week — to pressure-test the goal, map the constraints, and decide whether building is even the right answer. Honest scope before honest estimates.
02

Architecture & estimate

+
A written proposal with the architecture decisions, the trade-offs, and a phased estimate. You see the reasoning, not just the number.
03

Build in slices

+
Agile delivery in short cycles. A working build at the end of every sprint, demoed live, with priorities re-checked against the goal — not against the original plan.
04

Launch & support

+
Production launch, documentation handoff, and a defined window of post-launch support. Optional retainer for ongoing development.
Experience

A career building for the names you know.

Two decades across enterprise software, pre-sales engineering, and project management — selling, building, and supporting the mobile and software platforms inside Fortune 500 operations.

2025 — Present

Creator — KJD AI Chat

Independent · AI Product

Designed and built KJD AI Chat, a conversational AI assistant, end to end — currently in review as an Android app. Covers the full stack: LLM integration, prompt and conversation design, and the mobile front end. Try the demo →

2026

Contractor — MJS Courier Compliance System

Independent · Amazon DSP Client

Designed and built a driver messaging and compliance platform for an Amazon Delivery Service Partner: Cortex-report parsers, a multi-language coaching-text engine with manager review-and-send, an hours-and-breaks compliance engine, AI-written appraisals and dispute drafting, and a scorecard risk cockpit. Visit the site →

2021 — Present

Sr. Project Manager / Lead Engineer

Exono.me · San Francisco

Planning and delivering software across a cross-functional team in the US, Haiti, and the Philippines. Scope, partnerships with VARs, and hands-on integration of emerging tech including modern LLMs.

2018 — 2020

Sr. Android Sales Engineer

Panasonic · Newark, NJ

Customer-facing engineer for all Panasonic mobility business east of the Mississippi. Demo applications, partner SDK enablement, and coordination with Japan-based development teams on hardware SDK features.

2007 — 2017

Sr. Pre-Sales Engineer

Zebra / Motorola / Symbol · Holtsville, NY

Ten years as trusted advisor on enterprise mobility, barcode, and RFID rollouts across T&L, Retail, and Medical. Direct work with UPS, Bed Bath & Beyond, Toys R Us, Verizon, Pepsi, and others.

2000 — 2007

Software Engineer / Architect

Symbol · Gerber Tours · Novasync

Tier-3 SDK support and team lead at Symbol. Lead developer at Gerber Tours building the customer-facing web platform. Software architect at a 20-person mobile startup — where wearing every hat is how you learn the business.

— Clients & companies along the way
UPS Verizon Pepsi Panasonic Zebra Motorola Bed Bath & Beyond Toys R Us
Selected Work

Recent projects.

A snapshot of recent work — production sites and platforms currently live and serving real users. Click through to see them in action.

Web App Data Aggregation 2026

NovaSync

A real-time astronomy dashboard aggregating live data from NASA, ESA, JAXA, NOAA, and dozens of public observatories worldwide. Live ISS video, solar imagery, space weather, launches, and asteroid passes — synchronized in one window.

novasync.dev
TMR
Marketplace SaaS 2024–2025

TMR USA

Nationwide peer-to-peer marketplace for renting tennis ball machines and pickleball machines from local owners. Built on the Exonome platform — sellers list across 17+ states, customers book by city, owners earn from idle equipment.

tennismachinerentals.com
Web + Mobile App Logistics 2025

EZDrop.to

Same-day return-pickup service launching on Long Island — verified runners collect QR-coded packages from your door and drop them at UPS, FedEx, or Amazon. Built the web platform and the mobile app, including the runner-side gig workflow.

ezdrop.to
Educational Web App Language Learning 2026

European Portuguese Learner

A cross-linked suite for learning European Portuguese, built for my kids: an interactive study handbook, a 175-question adaptive quiz with Spanish comparisons, spaced-repetition flashcards, a drag-to-build sentence game, an illustrated comic, and a curated listening-resources hub — all with pronunciation guides and deep links between them.

kevinjoao.com/portuguese
MJ
Web App Logistics / Compliance 2026

MJS Courier — Driver Messaging & Compliance

A driver messaging and compliance system for an Amazon DSP. Parses Cortex report exports into personalized, per-driver coaching texts in five languages, routed through a manager review-and-send dashboard and logged as coaching history. Includes AI-written driver appraisals, a scorecard risk cockpit, an hours-and-breaks compliance engine, AI-drafted Amazon disputes, and a natural-language "ask the data" assistant.

mjscourier.com
Published Work

Books on the numbers behind everything.

A two-book series exploring the fine-tuning of the universe — the cosmological constants, physical laws, and probabilistic edges that make existence possible. One written for young readers, one for adults. Same big question, two audiences.

AI Dev

An honest partner for the AI conversation.

The hype cycle is loud. The real question — what's actually worth building, and what isn't — needs someone who has done both sides: delivered production software for two decades, and spent the last two years with hands deep in modern AI tooling.

Recent hands-on work spans LLM-powered document intelligence over thousands of PDF pages, ComfyUI text-to-image and image-to-video pipelines, custom LoRA training on RunPod GPU infrastructure, and agentic development with Claude Code across .NET and web projects.

Discuss your AI strategy
RAG / Document Intel
Natural-language querying over your knowledge base
Generative Media
Image & video pipelines, custom LoRA training
Agentic Workflows
AI-assisted development & automation
Strategy
Where AI fits, and where it doesn't (yet)
INPUT CONTEXT OUTPUT

Let's build something.

Whether you have a defined project, a vague AI ambition, or a legacy system that needs love — a 30-minute call is the best way to find out if we're a fit.

Email
Location
Bethpage, NY