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Theo Kallioras

@theokallioras

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Senior iOS engineer and product-minded mobile tech lead, shipping native apps end-to-end.

Costa Rica

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What I'm looking for

I seek senior-level iOS roles or fractional mobile tech lead positions where I can own the iOS stack, improve architecture and testing, mentor teams, and help products grow with data-driven releases.

I am a Senior iOS Engineer and product-minded builder with experience designing and shipping native iOS apps since 2015 for startups and established businesses worldwide. I partner with founders from idea to App Store, shape scope and UX, and deliver maintainable architectures (Swift/SwiftUI/UIKit, offline-first data layers), owning the iOS stack end-to-end as a senior IC or fractional mobile tech lead.

My recent work includes leading product and engineering on consumer pet-health apps and safety-critical ALPR tools, improving stability and performance with automated tests and profiling, and introducing CI/CD, ASO and AI-assisted workflows to accelerate delivery and growth. I also design and deliver iOS training curricula and mentor engineers to raise team capability.

Experience

Work history, roles, and key accomplishments

Current

Senior iOS Engineer

Current

pulsify.io

Apr 2020 - Present (6 years 2 months)

Independent consultancy where I design, build and ship native iOS products end‑to‑end, typically as a fractional Senior iOS Engineer / mobile tech lead for startups. Partner with founders from idea and discovery through UX, technical design, implementation and launch.

Swift SwiftUI UIKit MVVM RevenueCat CI CD Automated Testing Vapor

Senior iOS Engineer

Carma Project

Aug 2019 - Apr 2023 (3 years 8 months)

Core member of the in‑house team, leading the architecture and development of three native iOS apps (one public, two enterprise) for a safety‑critical ALPR platform. Owned the mobile codebases end‑to‑end, working directly with the CTO/CEO/product to turn safety and business needs into shipped features.

Swift UIKit SwiftUI MVVM Realm Xcode Instruments Camera APIs Performance Profiling

Technical Training Director

Code.Hub

Jan 2021 - Jan 2022 (1 year)

Designed and delivered the iOS Academy curriculum for Accenture cohorts, delivering 60+ hours of training on Swift, SwiftUI and UIKit and mentoring final projects to align hiring outcomes.

Curriculum Design Swift SwiftUI UIKit Mentoring IOS SDK Technical Leadership

iOS Developer

Freelance

Aug 2015 - Aug 2019 (4 years)

Shipped native iOS apps for multiple clients across fitness, social and hospitality, building UIs, networking, persistence and geolocation features from 2015–2019.

UIKit Alamofire Firebase Core Data REST APIs CI CD App Store Deployment