9:41

Jan Grünwaldt

Software Engineer

Specialized in mobile development (Flutter) with experience across backend systems, cloud infrastructure, and full-stack solutions.

100K+
Users Reached
4.6★
App Store Rating

Professional Experience

Software Engineer — Mobile (Flutter, Firebase)
Feb 2024 - Present
Yukawa Exponential GmbH | Remote
SWAN
  • Brought on as the second mobile engineer for SWAN, building a social commerce platform for beauty content consisting of a mobile app and a smart mirror
  • Delivered major product features in first 6 months - including live streaming, paid video content and a complete e-commerce overhaul, that ultimately led to a $10M extended seed investment
  • Conducted technical interviews for Flutter developer positions, contributing to team growth from 7 to 14+ members
  • Introduced project-specific Cursor rules (patterns, tests, localizing), boosting AI output quality
Everskin
  • Owned mobile development in a cross-functional team of 5 for everskin, a Swiss personalized skincare startup, delivering an iPad app for dermatologists and consumer Android/iOS apps
MATS
  • Led mobile development for MATS, an endurance athlete coaching app startup, driving modernization of app architecture and state management with BloC and extending core app features
  • Engineered a high-performance rewrite of the workout calendar, transforming the app's flagship feature from at lowest 16FPS to 86-120FPS and decreased initial load time by 45%
  • Built a smart trainer feature for spinning bikes, including complex UI with real-time workout graphs, while collaborating with a teammate who handled BLE connectivity
Full-Stack Engineer (Flutter, NestJS, TypeScript, SQL, Firebase, Google Cloud)
Jun 2022 - Mar 2023
knips.io | Oslo, Norway
  • Built features in Flutter and developed backend APIs with NestJS as part of a 7-person team at knips.io, a seed-stage startup building a B2B mobile-first newsletter SaaS
  • Delivered key features under tight deadlines for investment rounds
  • Introduced 50+ lint rules, and a feature-first folder structure to improve code maintainability
  • Led integration test effort, wrote 129/168 tests and automated integration tests with Codemagic
Co-Founder / Full-Stack Engineer (Flutter, TypeScript, Firebase)
Dec 2019 - Dec 2021
OurFlat GbR | Tübingen, Germany
  • Co-developed and launched OurFlat, a shared living app with 100K+ downloads and 4.6★ rating (app store)
  • Designed and implemented scalable backend services with Firebase (Firestore, Functions, Analytics, A/B Testing), including TypeScript Cloud Functions with 100% test coverage
  • Built CI/CD pipelines with GitHub actions for 1-click deploys and to run 100+ Flutter integration tests
Software Engineer Intern
Aug 2020 - Sep 2020
itdesign GmbH | Tübingen, Germany
  • Worked as part of an agile software development team using SCRUM
  • Implemented features of a CRM web app in Java
  • Maintained and extended complex automated test suite
  • Introduced Selenide into the tech stack, resulting in faster and less flaky tests
Software Engineer Working Student
Oct 2018 - Jun 2019
itdesign GmbH | Tübingen, Germany
  • Worked as part of an agile software development team using SCRUM
  • Developed new automated GUI tests using Java, Selenium, and TestNG for a large web application
  • Documented test results in Jira and Confluence
  • Updated test infrastructure using Jenkins and MSSQL to support the latest application versions and speed up result evaluation
Software Engineer Intern
Aug 2018 - Oct 2018
yWorks GmbH | Tübingen, Germany
  • Implemented features of an interactive sequence-diagram editor for a customer using the yFiles WPF framework and C# with Microsoft Visual Studio and Git.
  • Ported and enhanced application demos from yFiles HTML to yFiles WPF, using JavaScript, C# and WPF
  • Created a compatibility layer for the import of GraphML files to Graphity, a diagram editor for confluence, using TypeScript, Git and JetBrains WebStorm.
Software Engineer Working Student
Nov 2017 - Mar 2018
Tiksys GmbH | Tübingen, Germany
  • Implemented key features of a mobile application to track work time with server-based data synchronization
  • Implemented app customization and in-app payment features using JavaScript, Framework7, and Cordova
Software Engineer Intern
Jul 2016 - Oct 2016
Tiksys GmbH | Tübingen, Germany
  • Implemented an editor for easy creation and updating of surveys in a survey web application
  • Added customizable survey style as a new selling point using PHP, SQL, HTML/CSS, and jQuery
  • Developed an HTTP-API-Client in Java that is fully configurable via XML and can create API response statistics that allowed us to detect temporary spikes in API response time as the cause of lag

Technical Skills

Programming Languages

TypeScript/JavaScript Dart Python SQL C# PHP Java/Kotlin HTML/CSS

Frameworks & Libraries

Flutter NestJS Node.js Firebase Google Cloud

Tools & Technologies

Firebase Suite Google Cloud GitHub Actions CI/CD Git Sentry Figma

Education

M.Sc., Informatics
University of Oslo | Oslo, Norway
Aug 2021 - Dec 2023

Specialization: Programming and System Architecture
Master's Thesis with SINTEF Research Institute: "Digital Twin for DevOps: Data-Driven Continuous Monitoring of DevOps Systems and Teams"

B.Sc., Informatics
University of Tübingen | Tübingen, Germany
Oct 2017 - April 2021

Awards: Graduated with Distinction, German National Scholarship (2018, 2019)

Exchange Student
Tufts University | Boston, USA
Sep 2019 - May 2020

Fulbright Travel Grant

Get In Touch

Email
jan@jangruenwaldt.com