Senior Software Engineer · Custom Code, Mobile Apps, AI Systems

Fortune 100 and Fortune 500 work through Champlin Enterprises. Local businesses because community matters. 20+ years shipping production systems—end-to-end, no junior handoffs, no offshore layers.

What I build Web apps · iOS & Android · AI integrations
Stack TypeScript · Swift · Kotlin · PHP · .NET · Python

Start a project See recent work

Kevin Champlin — Senior Software Engineer based in Illinois

I live in this stack.

AI isn't a tool I tried — it's how I work. Eight-plus hours a day inside Claude Code, across dozens of production systems. I treat Claude like a senior engineer on day one: scoped tasks, verified diffs, no hallucinated commits.

The frontier I'm chasing right now: machine learning guided by AI. Claude designs the feature set, picks the model class, reads the validation curves, and rewrites the pipeline. The ML models do the quantitative lift. Diamond and Vantage are running this loop in production.

AI Showcase ai.kevinchamplin.com Public, interactive walkthrough of how I actually use AI day-to-day. Educational. Free.
Diamond AI MLB prediction engine Predictions auto-graded hourly. Self-tunes overnight from yesterday's accuracy. Live since opening day.
Vantage AI Self-tuning market analysis Three models — momentum, mean-reversion, sentiment — with weights that re-tune every grading cycle and Claude-driven insight commentary.

See it running Read how I run it

Featured offer · For VPs of Engineering

Find the AI integrations already hiding in your codebase.

Two-week audit. Three highest-ROI AI integrations identified, scoped, and ranked. One working pilot for the top pick. $15K flat, credited toward implementation if we build any of them.

For mid-market enterprises with 50–500 engineers, a codebase that's been in production three-plus years, and a board that mandated an AI strategy six months ago. No deck. No workshop. A senior engineer, two weeks, one shippable outcome.

See the audit Book a scoping call

Capabilities

Custom software built to ship—not to demo.

Web apps, mobile apps, and AI integrations engineered end-to-end by a senior engineer. Your code, your repo, your ship date. No middle layers.

Custom Software Development

Web apps, APIs, and internal platforms built for production. Full-stack engineering across TypeScript, PHP, .NET, and Python—designed to scale, documented to maintain, owned by you.

See how I engineer it

iOS & Android Apps

Native iOS (Swift/SwiftUI) and Android (Kotlin/Compose) apps—plus Kotlin Multiplatform when you need both without doubling the cost. App Store and Play Store ready.

See shipped apps

AI Integration & Training

LLM systems that survive production: agentic workflows, RAG pipelines, and custom tooling. Plus self-serve training through three published books and the Generative Identity Engine.

See AI capabilities

Enterprise WordPress

Custom themes, custom plugins, headless WordPress, and performance tuning. Content systems that stay fast at scale and integrate cleanly with the rest of your stack.

See WordPress work

About Kevin

Senior engineer. Builder by hand.

I build production software. Web, mobile, and AI systems shipped end-to-end. 20+ years of code behind me—PHP, .NET, Swift, Kotlin, TypeScript, Python—which means I skip the handoffs and ship the thing myself.

Most of my Fortune 100 and Fortune 500 work runs through Champlin Enterprises, LLC—senior engineering on AI integration, platform rebuilds, and custom software for companies like Wells Fargo and household-name consumer brands.

Senior engineering with Champlin Enterprises, LLC

I also work with local businesses—restaurants, nonprofits, chambers, the occasional chiropractor. Community matters. Same engineer who ships for a global apparel brand is the same one who'll build your storefront or your booking app.

Fortune 100 & 500 engineering Through Champlin Enterprises—AI integration, platform rebuilds, custom software under NDA.
Mobile & web builds iOS (Swift), Android (Kotlin), cross-platform (KMP), and full-stack web apps—shipped end-to-end.
Local businesses welcome Community work matters. Same senior engineer, same standards, scoped to fit.
Open-source skills Six Claude Code skills I use daily, published free on GitHub — context discipline, parallel agent audits, pre-deploy review.

Generative Identity Engine

New: CTA Builder — multi-product, multi-spokesperson ads in one click.

Business owners plug in their workspace narrative, hero products, and teammates once—then let CTA Builder craft campaign-ready stills with auto-generated copy. Surface the right people, the right SKUs, and the right CTA in a single batch.

🧑‍🤝‍🧑 Multi-voice ready Tag multiple teammates or spokespeople per render.

📦 Multi-product storytelling Highlight multiple SKUs or bundles in a single set.

✨ AI autofill Drafts headline, body, badge, and CTA from your company narrative.

📊 ROI for owners Ship platform-ready creative without hiring a performance team.

⚡ Zero-cost trial with instant CTA Builder access
🎯 Keeps every face, product, and tone on-message across ratios
📈 Business owners save ~$4–6K/mo on agencies and media freelancers

Experience GIE free See CTA Builder workflow

Giving a TED talk on stage, confident pose, audience in the background, professional lighting

Avg render time (latest batch) 12 seconds

Social posts launched 4,100+

Reference angles needed Front · Left · Right

New from Kevin Champlin

Three books on practical AI — for operators, builders, and everyday users.

Just Use It is the no-jargon guide to ChatGPT, Gemini, and Claude for parents, students, business owners, and seniors. The Operator's Edge gives small business owners a 30-day plan to deploy AI across the whole business. Ship It is the field report on using AI to build two working apps in a single afternoon.

Available on Amazon Kindle
No technical background required
Read in a weekend, apply the same week

See all three books Just Use It on Amazon

Open source

The skills I use every day, free for anyone to drop in.

Six skills I built and lean on every day — context discipline, parallel agent audits, pre-deploy review. MIT-licensed, no signup, no upsell. Clone the repo, copy a folder into ~/.claude/skills/, and you're shipping with the same toolkit I am.

token-discipline Stretch your context window. Seven habits that keep long sessions cheap.
lean-context Emergency mode for conversations that are running long. Checkpoint, audit, lock down.
superteam Seven parallel specialist agents auditing your project end-to-end.
review Pre-deploy security & quality scan with severity-ranked findings.
frontend-design Distinctive, production-grade frontends that avoid generic AI aesthetics.
ux-designer Modern UX best practices for SaaS — conversion, accessibility, anti-patterns.

Browse the repo on GitHub Read the writeup

Why hire me

One engineer. Full accountability. Shipped code.

20+ years in production

Code shipped at Fortune 100 banks, global consumer brands, and your-block local businesses. Same engineer, same standards.

Full-stack, cross-platform

Web, iOS, Android, APIs, and data—engineered together so your product doesn't live on a handoff boundary.

AI that survives production

LLM integrations built past the demo: guardrails, verification, cost control. Real systems, not prototypes.

Ships without ceremony

Direct work. Weekly demos if you want them. Code you own, in your repo, the moment it's written.

From the journal

Notes on AI strategy, agentic workflows, and leading teams through adoption.

For more writing, see the Champlin Enterprises, LLC blog.

May 8, 2026

Enhancing Throughput: A Practical Approach to Legacy Modernization

Boost throughput in your organization by modernizing legacy systems. Discover strategies for effective implementation and common pitfalls to avoid.

Enhancing Delivery Speed with AI-Driven Workflow Automation

Improve your delivery speed through AI workflow automation. Learn practical steps for implementation and potential pitfalls to avoid.

Enhancing Throughput with Private AI Tools

Learn how integrating private AI tools can significantly improve throughput in your organization.

Frequently asked questions

What does Kevin Champlin build?

Custom web applications, iOS and Android apps, and AI integrations—shipped end-to-end. Kevin engineers full-stack systems across TypeScript, Swift, Kotlin, PHP, .NET, and Python. Code lives in your repo, owned by you, built to scale in production.

Does Kevin work with Fortune 500 companies?

Yes. Most enterprise work runs through Champlin Enterprises, LLC—senior engineering for Fortune 100 banks, global consumer brands, and household-name apparel and beverage companies. Engagements are under NDA; the standard is not.

Does Kevin take on local business projects?

Absolutely. Local businesses, restaurants, nonprofits, chambers, and small operators are welcome. Community matters. The same senior engineer who ships for Fortune 500 clients builds local projects with the same standards, scoped to fit.

How does pricing work?

Send the build details—what you’re trying to ship, the constraints, the date—and I’ll come back with a number, not a brochure. Flat fee where possible. Senior engineering rates, not consultancy retainers. No bait-and-switch.

Does Kevin offer AI training?

Yes—self-serve. Three published books covering practical AI for operators, builders, and everyday users. Plus the Generative Identity Engine (GIE), a hands-on platform for multi-product, multi-spokesperson AI campaigns. Training through content and tools, not hour-billed coaching sessions.

What tech stacks does Kevin work with?

20+ years across PHP, .NET, C#, TypeScript, JavaScript, Swift, Kotlin, and Python. Mobile in Swift/SwiftUI (iOS), Kotlin/Compose (Android), and Kotlin Multiplatform (cross-platform). AI integration with Claude, GPT, Gemini, and custom agentic toolchains. Legacy modernization across Visual Basic and Classic ASP when it comes with the territory.

Start a project

Custom software, a mobile app, or an AI integration?

Send me the details—what you're building, what's in the way, what ship date you need. I'll reply within 24 hours with a realistic plan, not a sales pitch.

Location Gurnee + La Salle, IL · working globally
Fit Fortune 100/500 via Champlin Enterprises · local businesses welcome
How it runs Your repo, your code, direct with me. Weekly demos if you want them.

Direct email

hello@kevinchamplin.com

Response window

Usually within 24 hrs