TechJano · Portfolio
Built by a construction superintendent with over 15 years of field experience.
Shipped like product.
JANO Field™ is the flagship — field intelligence shipped to real jobsites. TechJano™ is the studio it grew into: offline-first, brand-cohesive, field-tested software, built across construction and beyond and held to the highest quality-control standard.
Construction & field intelligence
03 apps
JANO Field
Field intelligence for superintendents: daily reports, RFIs, LiDAR, weather, and 9 field calculators.
- Swift 6
- SwiftUI
- RealityKit
- CloudKit
Dig It
Utility mapping, digital 811 dig tickets, and crane safety for excavation crews. Single-tenant builds per General Contractor — narrated by Rusty, the AI field co-pilot.
- SwiftUI
- iOS 26
- MapKit
- Claude API
InspectorGadget
AR field-inspection copilot for Denver building compliance. On-device defect ML with TreeSHAP explainability and ePermits integration — every call is defensible.
- Swift 6
- ARKit
- CoreML
- TreeSHAP
Games & everyday
02 apps
MomWon
Six classic card games for iPhone & iPad — Solitaire, Poker, Pinochle — with 20+ themes, a deck builder, full accessibility, and a patient tutor. The first one, built for Mom.
- Swift 6.2
- SwiftUI
- FoundationModels
- CloudKit
Bob's Binder Booker
A Vacation Value Index calculator with a Neural Orb interface. It uses Photo OCR, voice input, and a Socratic AI concierge powered by Claude.
- SwiftUI
- Vision
- Claude API
- iOS 17+
Safety & social impact
02 apps
Haven
A private, offline-first safety toolkit for vulnerable youth — a secure document vault, off-grid peer connection, and local resources. No ads, no accounts, no cost.
- Swift
- React Native
- SQLCipher
- BLE mesh
SiteGuard
Real-time AI security for video and HLS streams — multi-stream risk scoring, a live operations console, and alert pipelines. On-prem, cloud, or air-gapped.
- FastAPI
- Next.js 15
- LangChain
- Supabase
Mobility & events
01 app
TechJano · The tools I built to keep learning
The tools I built to teach myself this craft.
I'm a solo developer who taught himself to code, so I built my own tools to learn faster and ship without cutting corners. These aren't products for sale — they're how one superintendent-turned-builder keeps getting better, one project at a time. I lean on AI the way I'd lean on any good tool: to learn the craft, never to replace the learning.
tonka-orchestrator
Scaffolds and iterates these apps across a constellation of models — local qwen on a Mac, Apple Foundation Models on device, and Claude — with a pre-flight discipline that classifies and routes each task before any code is written.
- Multi-LLM
- Ollama / qwen
- Apple FoundationModels
- Claude
jano-field-photo-report
Turns field photos of a construction defect into a professional diagnostic report — color-coded markup, labeled diagrams, root-cause analysis, a remediation plan, and a multi-page PDF, keyed to CSI MasterFormat divisions.
- Vision
- Annotation
- CSI MasterFormat
ios-swift-build
A reusable build playbook for native iOS — XcodeGen and xcodebuild, Swift 6 concurrency defaults, offline-first persistence patterns, privacy manifests, and signing through to TestFlight. The spine under every iOS app here.
- XcodeGen
- Swift 6
- Offline-first
- TestFlight
dispatch-and-grade
Delegates batches of work to sub-models, auto-grades the output, and keeps a scorecard per model and task type — so routing decisions get better with evidence instead of guesswork.
- Routing
- Auto-grading
- Scorecards
DocForge
A local document engine that turns structured content and a chosen look into a graded, standards-clean PDF — resumes, reports, one-pagers, decks — on a Typst typesetting spine, with a Chrome design lane and a quality-floor grader that won't let a sloppy document out the door.
- Typst
- Design system
- Quality-floor
About
From the field to the App Store.
I'm Terrence J. Kostelny. For 15 years I was a construction superintendent — running multi-million-dollar jobs where a missed detail costs real money and a missed safety call costs more. I build software the way I ran a site: offline-first, brand-cohesive, and held to the highest quality-control standard.
JANO Field came first — field intelligence for the people I used to work beside. TechJano is the studio it grew into. Since then I've shipped across construction (Dig It, InspectorGadget), consumer apps (MomWon — free forever, built for my mom), and social impact — Haven, born at Urban Peak's youth shelter, for the kids who haven't had a fair shake.
I'm a solo developer. I taught myself the programming languages these are built in, one project at a time, and I work to stay humble and teachable — there's no big team and no AI doing the work for me, just me learning the craft and the tools above that I built to learn it faster. Every product here is offline-first, privacy-respecting, and made to be used where it matters: a real jobsite, a kitchen table, or a kid's wrist.
- 15 years in the field
- 8 apps in testing
- 4 market sectors
- Offline-first, every one
Want a build matching these exact operating standards? kostelnyterrence@gmail.com.
Collaborate
Let's build something — together.
Open to the right collaborations. If any of these is you, reach out.
Build with me
Need a website or an app built to a real quality-control standard — offline-first, brand-cohesive, shipped on schedule? Let's scope it.
Start a build →Security consultants
Seeking security professionals to help verify and harden user-data protection across these apps — independent review, threat-modeling, and pen-testing partners welcome.
Verify our security →Impact Projects
I build free, no-ads apps for causes that matter (MomWon, Haven). If you're a non-profit — or want to collaborate on one — let's make something useful.
Collaborate free →