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Matthew Kaulfers headshot

Matthew Kaulfers

Senior iOS Developer

iOS engineering that ships reliably — at scale.

Senior iOS Developer with 6+ years of experience building and scaling production applications for Fortune 500 clients. Strong in Swift/SwiftUI/UIKit, iOS architecture (MVVM/Clean), and backend integration (REST/GraphQL) with a product-builder mindset.

SwiftSwiftUIUIKitAVFoundationWKWebViewFastAPISupabaseStripe

Highlights

  • Built a reusable iOS video player SDK (AVFoundation/AVKit) deployed across Fox News, Fox Sports, and Fox Weather.
  • Shipped secure payment flows via WKWebView + JS bridging (PCI-aware).
  • Founder of InfiniTea.gg, a production SaaS platform serving 104 Discord servers and ~30k+ daily active users.

Trusted with

Fortune 500 mobile surfaces and regulated workflows — delivered with strong ownership, mentoring, and stakeholder communication.

TELUS International logo
T‑Mobile logo
Fox News logo
FOX Weather logo
Lidl US logo
iFit logo
Blue Cross Blue Shield logo

CORE FOCUS

  • Architecture & maintainability
  • Performance & reliability
  • Product-quality UX & accessibility
  • Instrumentation & analytics

SKILLS

Technical strengths

A pragmatic toolkit optimized for shipping high-quality iOS experiences, with backend fluency when needed.

iOS & Mobile

SwiftSwiftUIUIKitAVFoundation / AVKitCoreBluetoothWKWebViewAccessibilityPerformance Optimization

Architecture

MVVMClean ArchitectureVIPERFeature FlaggingA/B Testing

Backend & APIs

RESTGraphQLPythonFastAPISQLAlchemyMySQLBigQuery

Cross-Platform

KotlinJetpack ComposeAndroid SDKXamarin

Tooling & Delivery

XcodeAndroid StudioGitHub ActionsGitLab CI/CDSonarQube

EXPERIENCE

Work history

Selected roles and impact, pulled directly from my resume.

Founder & Lead Developer

InfiniTea.gg Remote

08/2024 — Present

InfiniTea.gg logo
  • Designed, built, and maintain a production SaaS platform supporting 104 active Discord servers and ~30,000+ daily active users.
  • Architected a multi-service system: Next.js web app, high-availability Discord bot (TypeScript), shared Python API layer.
  • Implemented Supabase (Postgres) persistence, RBAC, analytics, and real-time updates; integrated Stripe billing and plan enforcement.
  • Built for operational reliability: containerized deployments, environment isolation, secrets management, automated rollouts.
Next.jsTypeScriptPythonSupabaseStripeDockerCI/CD

Senior iOS Developer

TELUS International (Formerly WillowTree Apps) Remote

05/2022 — Present

TELUS International (Formerly WillowTree Apps) logo
  • Led end-to-end delivery of production iOS features across multiple Fortune 500 client apps (design → release → post-launch).
  • Designed and built a reusable iOS video player SDK (AVFoundation/AVKit) for Fox News, Fox Sports, and Fox Weather to standardize playback + analytics.
  • Implemented secure payment workflows for Wyndham Rewards via WKWebView + JavaScript bridging with PCI-aware security practices.
  • Developed MyLidl Rewards features and authored a business/user impact analysis contributing to a $1.3M contract extension.
  • Built a backend aggregation system with Python/FastAPI/SQLAlchemy integrating Google/Adobe/Apple data for AI/ML pipelines.
SwiftSwiftUIUIKitAVFoundationWKWebViewFastAPI

iOS/Android Developer

Spear Education Remote

12/2021 — 05/2022

Spear Education logo
  • Developed features across iOS, Android, tvOS, and Amazon platforms with consistent UX and behavior.
  • Optimized CI/CD pipelines, reducing build + release times by ~30%.
  • Migrated Android features from Java to Kotlin; modernized UIKit components into SwiftUI to accelerate delivery.
SwiftUIUIKitKotlinCI/CD

Xamarin Developer

iFit Remote

01/2021 — 12/2021

iFit logo
  • Improved Bluetooth connectivity reliability for fitness equipment, increasing pairing success rates by ~25%.
  • Supported feature flagging, A/B testing, and remote configuration to enable safer deployments.
XamarinCoreBluetoothExperimentation

iOS Developer

Blue Cross Blue Shield Remote

06/2020 — 12/2020

Blue Cross Blue Shield logo
  • Refactored existing iOS features to align with Apple HIG, reducing App Store rejection/removal risk.
  • Ensured HIPAA-aware secure data handling, storage, and transmission practices.
SwiftUIKitHIGHIPAA-aware

iOS/Android Developer (Growth from QA)

Stormbreaker Studios Remote

10/2019 — 12/2020

  • Transitioned from QA into full-stack mobile development on production iOS and Android apps.
  • Built CRUD, analytics, and reporting features using GraphQL, BigQuery, and MySQL.
GraphQLBigQueryMySQL

PROJECTS

Featured build: InfiniTea.gg

A production SaaS platform built and operated end-to-end.

InfiniTea.gg

Community onboarding, automation, analytics, and monetization tools.

InfiniTea logo

Scale

104 active Discord servers and ~30,000+ daily active users.

System

Next.js web app + TypeScript bot + shared Python API layer.

Data

Supabase (Postgres), RBAC, analytics, real-time updates.

Billing

Stripe subscriptions, entitlements, plan enforcement across services.

Next.jsTypeScriptPythonSupabaseStripeDocker

Leadership & impact

  • Mentored QA, Android developers, and interns transitioning into iOS roles.
  • Participated in technical hiring: iOS system design, architecture, and problem-solving.
  • Led learning sessions on AI-assisted development workflows to improve team velocity.

APPS

Notable products

A quick visual index of apps and brands I’ve worked on.

T‑Mobile app icon

T‑Mobile

Fox News app icon

Fox News

Fox Sports app icon

Fox Sports

Fox Weather app icon

Fox Weather

Lidl US app icon

Lidl US

Spear Online app icon

Spear Online

iFit app icon

iFit

Blue Cross Blue Shield app icon

Blue Cross Blue Shield

Six Flags app icon

Six Flags

Deer Valley app icon

Deer Valley

CONTACT

Let’s build something great

Reach out directly, grab the resume, or connect on the platforms below.