Available for new opportunities

Panagiotis
Vakalis

Senior iOS Engineer

Athens, Greece

Years of experience

About Me

Crafting iOS experiences
that last

I'm Panagiotis, a Senior iOS Engineer based in Athens with nearly a decade of experience across fintech, mobility, and high-traffic consumer apps. I've spent most of that time owning features end-to-end — from data layer design and architecture decisions through to UI, testing, and analytics — at companies like Kaizen Gaming, BEAT, and IBM.

I care about writing code which is testable, maintainable, and built to last, not just code which ships. Alongside my day job, I build open source Swift tools and work on ideas that push what mobile can do — including apps designed to make everyday life more accessible.

Architecture

MVVMMVCMVP-C

Quick facts

LocationAthens, Greece

SpecialityNative iOS Development

LanguagesSwift, Objective-C

FocusScalable, testable architectures

Skills & Stack

Tools of the trade

Swift · UIKit · SwiftUIExpert / Advanced

Architecture DesignExpert

Networking · RESTful APIsExpert

Testing · XCTest · XCUITestExpert

Combine · async/awaitAdvanced

CI/CD · Fastlane / BitriseExpert

Languages & Frameworks

SwiftSwiftUIUIKitCombineasync/awaitObjective-C

Apple Frameworks

CoreDataCoreLocationAVFoundationMapKit

Architecture Patterns

MVVMMVP-CMVCClean Architecture

Testing

XCTestXCUITestSnapshot Testing

Tools & CI

XcodeBitriseSPMCocoaPodsGitHub ActionsInstrumentsGit

Practices

Agile/ScrumAI ToolingClaudeChatGPTCursor

Open Source

Built in the open

Loadable

A lightweight Swift package that brings a clean, composable state machine for asynchronous loading operations — idle, loading, loaded, and failed states — with zero boilerplate. Designed to make async data flow in SwiftUI and UIKit predictable and testable.

swiftswiftuiuikitasyncstate-machineios

SwiftGitHubOpen source

View all on GitHub

Experience

Where I've shipped

Delivered end-to-end features across a large-scale sports betting iOS app, owning the full cycle from data layer (DTO → Mapper → UIModel) through UI and analytics instrumentation.
Designed and implemented a protocol-driven dynamic table view data source architecture, replacing hard-coded integer-indexed sections with a component-ordered, extensible layout system supporting mixed content types.
Built multiple greenfield features including a player filtering system (MVP, UICollectionView-based filter chips and segment toggle), a star players carousel with 3D jersey rendering and skeleton loading states, and a live chat integration (SwiftUI + UIKit) with event-state-aware lifecycle management.
Integrated and maintained third-party SDKs (StreamLayer, VirtualStadium) across their full lifecycle — initial delivery, iterative version upgrades, and deprecation of replaced solutions.
Extracted reusable UI components and utilities into an internal component library and SPM packages, supporting multi-brand theming (light/dark mode, per-brand configuration) across two app targets.
Applied MVP architecture consistently across new features and legacy refactors, using protocol-based contracts between Presenter, DataSource and View layers.
Maintained comprehensive test coverage using XCTest (unit tests with Given/When/Then structure, snapshot tests for all major UI components) and instrumented user interactions with Google Analytics and BI metadata.
Collaborated across mobile, backend and product teams to deliver complex, data-driven betting features under strict performance and regulatory constraints.