iOS Engineer since 2012

iOS Engineer
from Hamburg

I develop native iOS apps that are used by thousand of users. Always focus on clean code, modularity, and performance.

Design
Code
Tooling
Sebastian Boldt Portrait Placeholder

Core Skills

Swift & SwiftUI
Point-Free Ecosystem
Modular Architecture
UX and UI Design

iOS Development Expertise

Focus on Clean Architecture, Modular Design and Maintainability.

Architecture & Modularity

I mainly use the Composable Architecture and the Point-Free ecosystem to keep complex logic clean, testable, and easy to follow. I also build scalable modular apps using Swift Package Manager, and I’m just as comfortable setting up solid architectures in plain SwiftUI/Swift without any external libraries.

The Composable Architecture Modular Architecture White-Labeling

Framework Knowledge

Extensive experience with SwiftUI and UIKit, including large codebases. If need I can also provide proficiency in older technologies like Objective-C and UIKit.

Swift SwiftUI Objective-C UIKit

Expertise in International and Local Development Environments

I am an experienced mentor and presenter that worked in large, international mono-repo and multi-repo environments and also smaller local setups.

Large Team Collaboration CI/CD Management Release Automation

Projects

Outside of my job, I explore ideas through personal projects.

Pianoo
Chords. Scales. Progressions.

Active Closed Source App

Pianoo is your ultimate musical companion—whether you're writing your first song, practicing jazz improvisation, or simply exploring new ideas on the piano.

Swift SwiftUI Core MIDI Core Audio The Composable Architecture SQLiteData CloudKit In App Purchases

HabitBe
The habit tracker for minimalists.

Active Closed Source App

HabitBe is a lightweight weekly habit tracker without unnecessary bells and whistles. Developed using core technologies like the Composable Architecture, Core Data, CloudKit and SwiftUI.

SwiftUI The Composable Architecture CoreData WatchKit WidgetKit Combine

More Projects

Jelly

A popular open-source library for animated, non-interactive, and interactive view controllers transitions.

Swift UIKit Core Animation Cocoapods
Active Open Source
Soundrocket

My first app in the App Store (2015). Discontinued and open sourced after API setting.

Objective-C UIKit StoreKit
Inactive Open Source

Work Experience.
Insights into my career.

10/2022 - Present
Lead Developer Mobile Applications (iOS) - Aviv
04/2016 - 10/2022
Software Engineer Mobile Applications (iOS) - Immowelt/Immonet
02/2015 - 03/2016
Mobile Application Developer (iOS) - Fashionfreax
08/2013 - 10/2014
Software Developer (C++ / QT / iOS / Android) - IPT Wismar

Education.

Master's degree in Multimedia Engineering, Hochschule Wismar

Bachelor's degree in Multimedia Engineering, Hochschule Wismar

Multimedia Engineering covers microprocessor technology and electronics, image processing and computer graphics, audio and voice technologies, system- and hardware-dependent programming, networking and communications, and application and web programming.

Blog & Publications

I stopped writing new posts to focus on other projects and, partly, because of the rise of large language models. Here are some of my earlier articles.

Get in touch

If you’d like to chat about my projects or share feedback, feel free to reach out anytime.