Senior iOS developer with 10+ years building production apps in Swift, SwiftUI, and Objective-C, plus 20+ years across software engineering and IT infrastructure. Proven record shipping mission-critical iPad and iPhone applications for aviation, logistics, automotive, and financial services clients. Currently leading personal open-source work in agentic AI systems and SwiftUI tooling for specialized domains. Strong focus on architecture (MVVM/MVC), dependency injection, testing (TDD/BDD, XCTest), CI/CD (Bitrise/Concourse/Fastlane), and reliable hardware + networking integrations.…

Jeffrey B. Kunzelman

PRO

Senior iOS developer with 10+ years building production apps in Swift, SwiftUI, and Objective-C, plus 20+ years across software engineering and IT infrastructure. Proven record shipping mission-critical iPad and iPhone applications for aviation, logistics, automotive, and financial services clients. Currently leading personal open-source work in agentic AI systems and SwiftUI tooling for specialized domains. Strong focus on architecture (MVVM/MVC), dependency injection, testing (TDD/BDD, XCTest), CI/CD (Bitrise/Concourse/Fastlane), and reliable hardware + networking integrations.…

Available to hire

Senior iOS developer with 10+ years building production apps in Swift, SwiftUI, and Objective-C, plus 20+ years across software engineering and IT infrastructure. Proven record shipping mission-critical iPad and iPhone applications for aviation, logistics, automotive, and financial services clients.

Currently leading personal open-source work in agentic AI systems and SwiftUI tooling for specialized domains. Strong focus on architecture (MVVM/MVC), dependency injection, testing (TDD/BDD, XCTest), CI/CD (Bitrise/Concourse/Fastlane), and reliable hardware + networking integrations.

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Skills

Experience Level

iOS
Expert
Swift
Expert
API
Expert
AWS
Expert
Python
Expert
GitHub
Expert
UI
Expert
Claude
Expert
GraphQL
Expert
SQL
Expert
C
Expert
PowerShell
Expert
Google Cloud
Expert
React Native
Expert
Objective-C
Expert
Prompt Engineering
Expert
Web Design
Expert
HTML5
Expert
GitHub CoPilot
Expert
Docker
Expert
SQLite
Intermediate
Jira
Intermediate
ChatGPT
Intermediate
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Language

English
Fluent

Work Experience

Owner and Software Engineer at River.io LLC
September 1, 2025 - Present
Design and ship native iOS and Android apps end to end: CareTime (caregiver time-tracking with EVV and a SHA-256 audit chain), ClientAPT (an encrypted appointment manager live on the App Store and Google Play), MaterialsAndPractices (organic-farm records), and sloth (passive network-security analysis in C99). Test-first with 1:1 unit-test parity across platforms and zero third-party dependencies. Also operate a multi-agent AI operations platform and agents that manage real-world rental units.
Information Technology Specialist at VARC Inc.
November 1, 2024 - Present
Established enterprise coding standards and an AI-assisted code review process for a production PowerShell automation library, enforcing error handling, input validation, and consistency. Applied CI/CD patterns to PowerShell deliverables and built reusable command-line components consumed by internal tools.
IT Specialist at VARC Inc.
November 1, 2024 - August 31, 2025
Automated Microsoft 365 user provisioning, manager assignments, group memberships, and license management with descriptive error handling and fail safes. Developed custom Co-Pilot agents to support HR and IT workflows, streamlining documentation, onboarding, and training. Reduced repetitive administrative tasks, saving staff time and minimizing errors. Improved consistency and efficiency of IT operations through PowerShell automation and Microsoft Graph integration.
Solo Developer at MaterialsAndPractices — SwiftUI Compliance App
January 1, 2024 - Present
Developed a native SwiftUI iOS/iPadOS app for USDA NOP organic-certification record-keeping with offline-first Core Data and CloudKit sync, including testing tailored to a regulated record-keeping domain.
Founder / Lead Engineer at OpenClaw — Multi-Agent AI Platform
January 1, 2024 - Present
Built a Python multi-agent platform using the Anthropic Claude API, engineering failure-mode handling and test coverage for auth errors, rate limits, and token-budget exhaustion against a live LLM API.
Information Technology Manager at Cosan Foundation
June 1, 2021 - September 1, 2024
Managed network infrastructure across two sites (Cosan and Arcosan, AZ) using Ubiquiti UniFi, including the historic Cosan site. Migrated web hosting to DreamHost, reducing operating costs by $5K+/month, and migrated phone systems to VoIP for additional $2.5K+/month in savings. Directed fiber and Cat6 shielded cabling upgrades to address lightning-related infrastructure issues, with full training documentation for ongoing maintenance. Managed vendor relationships with Lumen, Adobe, Autodesk, Google, and other infrastructure providers.
Information Technology Manager at Cosanti Foundation
June 1, 2021 - September 30, 2024
Managed network infrastructure across two sites (Cosanti and Arcosanti, Arizona) using Ubiquity Unify. Oversaw vendor relationships with Lumen, Adobe, Autodesk, Google, and other IT infrastructure providers. Migrated the company’s web presence to Dreamhost, reducing operating costs. Led VOIP phone system migration. Directed fiber and network upgrades and updated wiring to Cat 6 shielded cable; authored training documentation for future maintenance.
Lead iOS Developer at AgPilotX
January 1, 2021 - August 31, 2023
Provided field reliability for an iPad aviation guidance system used by aerial-application pilots, delivering real-time guidance and telemetry and integrating with aircraft hardware (Bluetooth/Wi-Fi controllers, valve systems, heads-up displays) where software defects have safety consequences.
Lead iOS Developer at Cosanti Foundation
January 1, 2021 - August 31, 2023
Developed AgPilotX, an agricultural aviation guidance system for aerial spraying and seeding using iPads. Utilized Swift and MVVM architecture for system integration with aircraft hardware, including Bluetooth/Wi-Fi controls, valve systems, and heads-up displays.
Senior iOS Developer at Haulynx
July 1, 2019 - November 30, 2020
Contributed to a logistics app for long-haul truck drivers, managing electronic driver logs and load management. Implemented CI/CD systems using Bitrise, providing data-driven insights with Splunk and Amplitude metrics. Led the migration from Google Firebase to AWS GraphQL DB.
iOS Consultant at Maven Car-Sharing (General Motors)
August 1, 2018 - May 1, 2019
Built test infrastructure and automated delivery pipelines for the Maven iOS car-sharing application. Introduced Nimble/Quick BDD-style testing and improved deployment efficiency with Concourse CI.
iOS Consultant — Maven Car-Sharing at General Motors
August 1, 2018 - May 31, 2019
Built the team’s test infrastructure and automated delivery pipelines on Concourse CI (pipeline-as-code) with environment promotion and automated test gates feeding continuous deployment to test fleets. Introduced Nimble/Quick BDD and established TDD practices.
Consultant at General Motors
August 1, 2018 - May 31, 2019
Developed test infrastructure and automated delivery systems for Maven, a car-sharing app. Introduced new testing protocols using Nimble/Quick and enhanced deployment efficiency with Concourse CI.
Lead Mobile Developer at GPS Insight
January 1, 2016 - August 31, 2018
Led the redesign and complete rewrite of the primary iOS app within eight months. Served as designer and lead developer for asset-tracking applications using Google Maps.
Development Anchor at AAA Insurance
April 1, 2015 - December 31, 2015
Led a team of six developers building iOS and Android apps for AAA insurance customers. Collaborated with Pivotal Labs to bring development in-house, retaining BDD and rapid delivery methods using Spring Boot.
Senior Software Engineer at Charles Schwab
October 1, 2011 - December 31, 2014
Developed native iPhone and iPad clients for IT service management. Built operational intelligence tools using Splunk, creating unified dashboards for app and mobile infrastructure monitoring.
Senior Developer at Ashley Furniture Industries
December 1, 2009 - May 31, 2011
Developed and launched the iAshley iPad sales catalog app for over 500 company sales professionals and Ashley HomeStores.
Principal Systems Engineer at DHL
March 1, 2004 - May 31, 2009
Developed sales and tracking applications for the Blackberry OS, streamlining operational efficiency for DHL’s sales force.
Web Master at Cosanti Foundation
September 1, 2001 - March 31, 2004
Designed and maintained the Cosanti Foundation’s main website, www.arcosanti.org.
Webmaster at Cosan Foundation
January 1, 2001 - January 1, 2004
Designed and maintained arcosan6.org (webmaster).
Software Developer at IBM / State of Washington / Target Stores / Thomson Reuters
December 31, 1991 - December 30, 2001
Held various programmer and developer roles.

Education

B.A. in Liberal Arts at Winona State University
January 1, 1988 - December 31, 1992
Digital Media Design at Minneapolis College of Art and Design
January 1, 1999 - December 31, 2001
Online Courses in Software Engineering at Stanford University
January 1, 2010 - December 31, 2010
ITIL v3 Foundation at Hewlett Packard
January 1, 2008 - January 1, 2008
Recertification (ITIL v3) at Hewlett Packard
January 1, 2016 - January 1, 2016
Computer Science Coursework at Stanford University (Online)
January 1, 2010 - July 18, 2026
Sun Certified J2EE Developer at Sun Microsystems
January 1, 2000 - July 18, 2026
B.A., Liberal Arts at Winona State University
January 1, 1992 - July 18, 2026
ITIL v3 Foundation at Hewlett-Packard
January 1, 2008 - January 1, 2016
Computer Science Coursework at Stanford University (Online)
January 1, 2010 - July 18, 2026
J2EE Developer at Sun Microsystems
January 1, 2000 - July 18, 2026
Digital Media Design at Minneapolis College of Art and Design
January 1, 1999 - January 1, 2001
B.A., Liberal Arts at Winona State University
January 1, 1992 - July 18, 2026

Qualifications

ITIL V3 Foundation Certification
January 1, 2008 - December 31, 2016
J2EE Certification
January 1, 2000 - December 8, 2025
Online Courses in Software Engineering
January 1, 2010 - December 31, 2010
ITIL v3 Foundation
January 1, 2008 - July 18, 2026
ITIL v3 recertification
January 1, 2016 - July 18, 2026
Sun Certified J2EE Developer
January 1, 2000 - July 18, 2026
ITIL v3 Foundation
January 1, 2008 - January 1, 2016

Industry Experience

Software & Internet, Professional Services, Education, Non-Profit Organization, Government, Financial Services, Transportation & Logistics, Agriculture & Mining, Healthcare, Other
    Crane: Vendor-Neutral Healthcare Workforce Marketplace

    ![Crane](https://www.twine.net/signin

    Crane is a graph-backed, vendor-neutral marketplace for healthcare contingent labor. A provider posts a shift, every credentialed agency competes for it at the same instant, and only a credential-compliant clinician can be placed, with exact auditable money end to end.

    Built with Elixir (Bandit and Plug), a Neo4j graph, and an encrypted PHI vault. Five load-bearing invariants, each enforced in code with its own test: no PHI on the graph, atomic simultaneous broadcast, a hard credential gate, exact integer-cent money, and tests as the oracle.

    What it includes

    • Server-rendered dashboards for providers, agencies, clinicians, finance, and least-privilege operators
    • GAAP double-entry accounting, credential expiry alerts, PDF invoices, 1099 payouts, and geofenced clock-in
    • A pluggable integration layer (EVV, payroll, ATS, credential-wallet import) and a ReBAC authorization model
    • Deployed and internet-exposed over HTTPS via a hardened, database-private topology

    More: https://www.twine.net/signin

    Materials and Practices: Records and Compliance for Organic Farms

    ![Materials and Practices](https://www.twine.net/signin

    A universal iPhone and iPad app for small-scale organic farms, built with SwiftUI, Core Data, and CloudKit, with zero third-party dependencies.

    What it does

    • USDA-sourced plant-cultivar database, grow management, and soil-health monitoring with a pH spectrum and lab integration
    • Agricultural lease management with payment tracking, and worker time tracking with overtime detection
    • FDA FSMA harvest-safety checklists and full traceability of organic amendments
    • CloudKit sync across devices; fully localized in English and Spanish

    Live on the App Store: https://www.twine.net/signin

    sloth: Passive Wi-Fi and Network Security Analysis (C99)

    ![sloth](https://www.twine.net/signin

    sloth is a fully passive Wi-Fi and network security analysis tool written in C99 for Linux (ncurses + libpcap + nl80211). It observes and never emits: no packet injection, no scanning, no kernel-state changes.

    What it does

    • 23 live ncurses views: 802.11 beacon, probe, and deauth sniffing, plus ARP / mDNS / NBNS / DHCP / SSDP device discovery
    • TLS ClientHello and JA3 fingerprint capture
    • Synthesized alerts for port scans, deauth floods, NXDOMAIN bursts, threat-intel hits, and periodic beaconing
    • Forensic JSONL log and per-alert pcap for downstream analysis

    Engineering

    Written in C99 from the kernel-facing code up, backed by 50 C unit tests with a fake_platform shim so the kernel-facing code is testable on any host.

    Source and releases: https://www.twine.net/signin

    ClientAPT: Encrypted Appointment Book for Solo Service Pros

    ![ClientAPT](https://www.twine.net/signin

    A privacy-first appointment book for solo service providers whose client list is itself confidential. Native iOS (Swift, SwiftUI, SwiftData) and Android (Kotlin, Jetpack Compose, Room) at feature parity, with zero third-party dependencies.

    What it does

    • On-device only: it never touches the network, iCloud, Siri, or Spotlight
    • Encrypted vault behind an app PIN, a second per-client PIN for flagged clients, and a duress PIN that opens a believable decoy vault when unlock is coerced
    • Test-driven, with 1:1 unit-test parity across the two platforms

    Live on the App Store: https://www.twine.net/signin
    Google Play: https://www.twine.net/signin