LEG.TJ
The national platform that connects government and development partners to plan, track, and improve education support in Tajikistan
Astro WebsiteSolid.js Web AppConvex BackendTypeScriptTailwindCloudflare NetworkBackblaze B2
Visit WebsiteDavid Siewert
Full-Stack TypeScript Developer
Solo full-stack typescript developer. Building Products from idea to production.
About Me
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.
Languages
EnglishGermanRussian
Projects
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
Astro WebsiteSolid.js Web AppConvex BackendTypeScriptTailwindCloudflare NetworkBackblaze B2Hetzner VPS
Visit Website
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.
Astro WebsiteReact.js Web AppBun BackendTypeScriptCloudflare NetworkHetzner VPS
Visit WebsiteOpen Source
astro-ui
TypeScript • Tailwind CSS • Astro
A library of reusable UI components for Astro projects.
solid-ui
TypeScript • Tailwind CSS • Solid.js
A library of reusable UI components for Solid.js projects.
email-generator
React Email • TypeScript • Cloudflare Worker
A lightweight, self-hostable service for rendering HTML emails.
utils
TypeScript • Library
A comprehensive collection of TypeScript utilities for common development tasks.
Experience
Lead Developer of LEG.TJ
Eductrade / EU Delegation in TJ
October 2025 - December 2025 (3 Month)
- •Designed and built the entire platform from scratch, from Design/UI/UX to infrastructure
- •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
Semesterkur UG
July 2025 - September 2025 (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
earlywings GmbH
January 2022 – June 2025 (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
assona GmbH
July 2017 – December 2021 (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
Early state startup
September 2016 – August 2017 (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
ID Information und Dokumentation im Gesundheitswesen GmbH & Co. KGaA
October 2013 – August 2016 (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 – 2015
Thesis: Using Machine Learning to Improve the Quality of Search Algorithms in General Game Playing
Bachelor of Science in Informatics
Technical University of Berlin
2009 – 2013
Thesis: Development of artificial intelligence for a multiplayer real-time game
Skills
languages
JavaScalaJavaScriptTypeScript
frontend
Solid.jsReact.jsNext.jsAstroViteRsbuildHTMLCSSTailwind
tools
GitGitHubGitLablinear.appDockerCI/CDJenkins
backend
BunNode.jsSQLSQLiteLitestreamCloudflareKubernetesConvex
OS
DebianFedoraBash scriptingFish shell
architecture
Functional Programming (FP)Test-Driven Development (TDD)Domain-Driven Design (DDD)Event Sourcing (ES)Command Query Responsibility Separation (CQRS)MicroservicesRESTful API Design
teamwork
Agile methodologies (Agile, Scrum, Kanban)Mentoring and coaching junior developersStructured coordination of tasks, processes, and documentation
Technical Features
Lightning Speed
Achieves 90+ scores on Google PageSpeed Insights for exceptional load times and user experience
Unhackable Security
100% secure static architecture with zero database or server-side vulnerabilities
Edge-Hosted
Deployed on Cloudflare Pages for instant global edge network distribution
Zero Maintenance Cost
100% free infrastructure with no recurring hosting or maintenance fees
CDN Accelerated
Cloudflare CDN ensures ultra-low latency and fast content delivery worldwide
Accessibility First
Semantic HTML5 with proper ARIA labels, landmarks, and logical section divisions
Optimized Readability
Carefully crafted typography and spacing for effortless reading experience
Light/Dark Mode
Seamless light/dark theme switching that respects system preferences
Fully Responsive
Pixel-perfect adaptation across all devices, screen sizes, and orientations
Privacy-First Analytics
Internal routing bypasses adblockers for accurate, uninterrupted insights
Media Optimization
Aggressively compressed images, icons, and SVGs without quality loss
Smart Caching
Custom _headers configuration for optimal browser and edge caching strategies
SSL/TLS Encrypted
Automatic SSL/TLS certificates ensuring end-to-end encrypted connections
Human-Touch
Hand-written and/or meticulously reviewed AI code by an experienced developer