David Siewert
Full-Stack TypeScript Developer
10+ years of professional development experience
Expert in modern Typescript/Web-frameworks and tools
Performance- and UX-driven in all stages of development
About
Full-stack engineer specializing in building complex web platforms from the ground up, spanning product design, real-time systems, and scalable infrastructure.
I’ve built real-time, collaboration-heavy platforms such as Leg.tj, Gruppenplan.com, and Postmaschine.com entirely from the ground up — spanning product design, frontend architecture, backend systems, and infrastructure.
My approach is product-driven: I focus on clarity, reliability, and long-term sustainability, ensuring systems scale gracefully and remain enjoyable to use and maintain.
Strong in React.js / Solid.js, Node.js / Bun, Convex, and event-driven architectures, with a focus on quality, maintainability, and stability.
Projects
LEG.TJ
The national platform that connects government and development partners to plan, track, and improve education support in Tajikistan
Postmaschine.com
Postmaschine is the smarter way to handle digital marketing, combining cutting-edge AI with human expertise to fully automate content creation, scheduling, and publishing
Gruppenplan.com
Efficiently organize and optimize group. Easily assign individuals to rooms, manage group preferences, and streamline planning for hotels, campsites, tents, and more. Ideal for tour operators, teachers, and event organizers.
Open Source
astro-ui
A library of reusable UI components for Astro projects.
solid-ui
A library of reusable UI components for Solid.js projects.
email-generator
A lightweight, self-hostable service for rendering HTML emails.
Experience
Lead Developer of LEG.TJ
October 2025 - December 2025Eductrade / EU Delegation in TJ
(3 Month)Empowered donors to manage over $100M in education funding across Tajikistan
Developed a web app with Convex backend for real-time data sync and collaborative workflows
Architected and deployed a scalable object storage infrastructure for securely storing official reports, policies, and long-term institutional data
Lead Developer of Postmaschine.com
July 2025 - September 2025Mora Montage UG
(3 Month)Built a modern Solid.js interface optimized for UI/UX responsiveness, and top-tier performance
Integrated Convex runtime to power real-time data synchronization and interactions
Automated end-to-end content production with AI to create dynamic, on-brand multimedia content at scale
Lead Developer of Gruppenplan
January 2022 – June 2025earlywings GmbH
(3.5 years)Analyzed, modeled, and implemented business processes in software (e.g., using EventStorming)
End-to-end development and operation of a complete full-stack application
Developed a real-time system enabling seamless team collaboration
Implemented authentication, authorization, role-based access control (RBAC), and access management
Designed and implemented an event-driven architecture for complete process traceability
Created intuitive user interfaces with a strong focus on speed and usability and responsiveness
Developed multilingual support (English and German) for the entire application
Secured infrastructure against DDoS attacks and cyber threats using Cloudflare
Set up, configured, administered and hardened all Linux servers
Full-Stack Software Developer
July 2017 – December 2021assona GmbH
(4 years)Developed server-side REST services in Java using Spring Boot 2.0
Built Kubernetes infrastructure using Rancher and Helm
Created a custom CI/CD pipeline with GitLab CI, including unit, integration, and system tests
Developed frontend applications with TypeScript, React.js, and Material UI (MUI)
Set up, integrated, and operated Keycloak for authentication and authorization
Introduced E2E testing based on Playwright
Designed and built microservices using event-sourcing architecture
Startup Development
September 2016 – August 2017Early state startup
(1 year)Conceptualized business model for startup
Introduced agile and lean startup principles to structure development efforts
Collaborated closely with a small founding team across technical and business roles
Learned function programming and Scala
Software Developer
October 2013 – August 2016ID Information und Dokumentation im Gesundheitswesen GmbH & Co. KGaA
(3 years)Developed reporting tools for the German Federal Cancer Registry Law
Migrated GWT web applications to AngularJS
Established Continuous Integration (CI) with Jenkins
Education
Master of Science in Informatics
Technical University of Berlin
2013 – 2015Bachelor of Science in Informatics
Technical University of Berlin
2009 – 2013Skills
languages
frontend
tools
backend
OS
architecture
teamwork
Steps
A collaborative approach focused on delivering quality results
Discuss
01Let's talk about your project goals, challenges, and vision. I'll listen carefully to understand your needs.
Design
02I'll create thoughtful solutions that balance aesthetics, functionality, cost and user experience.
Build
03Clean, scalable code that brings designs to life with attention to performance and maintainability.
Ship
04Deploy with confidence. I ensure smooth launches and provide support to keep things running perfectly.
Ready to Build Something Amazing?
Let's collaborate on your next project.
Get In Touch