Martin von Wysiecki

Sheet 01FULL STACK DEVELOPER

Full-Stack
Developer
& Tech Solutions

Building scalable web applications, mobile apps, and database solutions for startups and enterprises worldwide.

View Selected WorkGet In Touch
Fig. 01 — Portrait
Fig. 01 — PortraitRev. 2026
Name
M. von Wysiecki
Role
CEO / Developer
Base
Mannheim, DE
Status
Available Q3

What I build

02 / Services & Expertise02

Item 01

Web Applications

Custom web applications built with React, Node.js, and modern frameworks. Scalable, secure, and user-focused solutions.

  • React
  • Node.js
  • PHP
  • TypeScript

Item 02

Database Solutions

Database architecture, optimization, and integration with MySQL and MariaDB. Robust data management for enterprise applications.

  • MySQL
  • MariaDB
  • Python
  • API Design

Item 03

Mobile Development

Native iOS applications with Swift and cross-platform solutions. Performance-optimized apps for modern mobile experiences.

  • Swift
  • iOS
  • React Native

03 / Beyond the Screen

Three decades of crafting digital experiences

Fig. 02 — Studio, Mannheim
Fig. 02 — Studio, Mannheim

CEO and Full-Stack Developer with expertise in modern web technologies, mobile development, and database architecture.

From building pharmaceutical web applications to digital learning platforms, I deliver scalable solutions for startups and enterprises worldwide.

Years
30+
Projects
50+
Languages
3

Developer Tools

04 / Free Utilities04

Free, privacy-friendly developer utilities. Everything runs in your browser — no data leaves your device.

JSON Formatter

Format, minify, and validate JSON with syntax highlighting and error detection.

Base64 Encoder/Decoder

Encode and decode Base64 strings with full UTF-8 support.

Regex Tester

Test regular expressions with real-time match highlighting.

Cron Explainer

Translate cron expressions into human-readable schedules.

JWT Decoder

Decode JWT tokens and inspect header, payload, and claims.

Color Converter

Convert between HEX, RGB, and HSL color formats.

All tools

From Brief to Production

05 / How I Work05

  1. Scope

    Requirements, constraints and a fixed definition of done, written down before any code.

  2. Architect

    Data model, API surface and deployment shape agreed up front, so scaling is not a rewrite.

  3. Build

    Short iterations on a staging environment you can open and comment on at any point.

  4. Operate

    Dockerised deployment, monitoring and maintenance — the project keeps running after launch.

Get in touch

06 / Contact06

Ready to discuss your next project? Let's talk about how we can bring your ideas to life.

Write an Email
Location
Mannheim, Germany
Response
Within one working day
Martin von Wysiecki — Full-Stack Developer & Tech Solutions