Hey, I'm Nemanja

iOS developer based in Barcelona. I've spent 8 years crafting mobile experiences with SwiftUI and UIKit that users actually enjoy using.

Check out my projects

What I Do

iOS App Development

Native iOS applications built with Swift, SwiftUI, and UIKit. From MVPs to enterprise-scale apps serving millions of users.

Architecture & Code Quality

Clean, maintainable codebases with MVVM, dependency injection, and comprehensive testing. I build apps that scale.

Performance Optimization

Profiling, memory management, and optimization to ensure smooth animations and battery-efficient apps.

Legacy Modernization

UIKit to SwiftUI migrations, Objective-C to Swift conversions, and architecture refactoring for aging codebases.

My Background

I'm a senior iOS developer based in Barcelona with 8+ years of experience building native applications for startups and enterprises. My work spans healthcare, transportation, and social platforms, with a focus on creating performant, maintainable codebases that scale.

I specialize in Swift, SwiftUI, and UIKit, with extensive experience in complex UI implementations, API integrations, and app architecture. I've led development on apps serving millions of users, optimized legacy codebases, and built MVPs from scratch.

I value direct communication, clean code, and shipping quality products on time. Whether you need to build a new product, scale an existing app, or modernize your iOS codebase, I can help you deliver a solution that works for both your users and your business.

Contract Work

Selected client projects from my iOS contracting work with startups and enterprises.

Circlin: Buy & Sell Fashion

iOS Architect & Backend (Contract) - Video-first marketplace for pre-loved fashion. Architected iOS app and built GraphQL backend services.

Calendly Mobile

Short-term Contract - Implemented "Schedule in Real Time" feature with calendar API integration and performance optimization.

Car:Go Anywhere

Lead iOS Developer (Full-time) - Belgrade's Uber alternative serving 50k+ users. Led complete app overhaul and architecture redesign.

Cub: Self-Care Pet

A unique self-care app that gamifies your daily routines. Care for your virtual pet by completing real-life tasks and building healthy habits.

HapticLabs Player

Experience music in a new dimension with haptic feedback. This innovative player syncs vibrations with your favorite tunes for an immersive listening experience.

Included Health

Contract via Vicert - Healthcare platform refactoring. Led UIKit to SwiftUI migration following company merger.

Meridian Sport Srbija

Stay up-to-date with the latest sports news, live scores, and in-depth analysis from Serbia and around the world.

Promly for High School

A social platform designed for high school students to connect, collaborate, and access mental health resources.

Open Source

Swift libraries and tools I've built for the iOS developer community.

InstrumentsMCP

MCP server that gives AI agents access to Xcode Instruments. 29 tools for profiling CPU, memory, energy, leaks, hangs, launch time, SwiftUI, and network - all returned as structured JSON.

View on GitHub

SwiftHealth

CLI tool that evaluates Swift project health with a 0-100 score. Analyzes Git metrics, code quality, dependencies, and build performance.

View on GitHub

FloeKit

Elegant, modular UI building blocks for SwiftUI - design system, components, and utilities with built-in theming and accessibility.

View on GitHub

FloeNet

Lightweight and elegant networking layer for Swift apps - minimal, modern, and testable.

View on GitHub

Copy4LLM

Chrome extension that extracts web content into clean, LLM-optimized markdown. Perfect for feeding content to ChatGPT, Claude, or any AI.

View on GitHub

Indie & Personal Projects

Products I design, prototype, and ship on my own to explore new ideas and delight people I care about.

Midori - Matcha Ratio

A minimalist brewing companion that instantly calculates perfect water-to-matcha ratios for ceremonial, premium, and culinary grades.

Project Details App Store

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Daily Planner

A thoughtfully designed daily planning app that helps you focus on what matters most. Simple, beautiful, and distraction-free.

Coming Soon

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Budget Tracker

Smart budgeting made simple. Track expenses, set goals, and build better financial habits with intuitive insights.

Coming Soon

Get In Touch

Have a project in mind? Let's discuss how I can help bring your iOS app to life.

Or reach out directly:

nemanja@nemanjavlahovic.com