In development
Real-time Multiplayer · Game
Shadow Seek
A real-time multiplayer hide-and-seek game for two players.
- Next.js
- NestJS
- TypeScript
- PostgreSQL
Case study
Software Developer · Full-Stack Development · Digital Products
Digital products that turn ideas into experiences that work.
I build modern websites and web applications that combine professional design, clear user guidance and dependable technology.
Available for new projectsKaufbeuren, Bavaria · Germanyneue fische · Software Development
- Kaufbeuren, Bavaria · Germany
- neue fische · Software Development
- TypeScript · React · Next.js · NestJS · PostgreSQL
- Remote & on-site
01
Not just code. A product that works.
A website is not an end in itself. It should build trust, answer questions and turn visitors into enquiries — on every device, in every language your audience speaks.
That is why I combine development, UX/UI, product thinking and commercial goals. The result is a digital product that looks professional, runs reliably and moves your business forward.
- 01
A clear product
Structure, content and user flow follow one goal — not chance.
- 02
Strong user experience
Fast, understandable, accessible and considered on every screen size.
- 03
Dependable engineering
Type-safe implementation, clean architecture and a deployment that holds.
02Selected work
Projects that are live.
Every project here is reachable, usable and documented. Open the live version or read the case study.
03Services
What I build for you.
From a single landing page to a complete web application — including running it and developing it further afterwards.
Business Websites
Modern websites for companies, freelancers, professionals and personal brands.
Individual quote · based on project scope
Landing Pages
Focused pages for advertising, product launches, service offers and enquiries.
Individual quote · based on project scope
Full-Stack Web Applications
Frontend, backend, API, authentication, database and deployment.
Individual quote · based on project scope
MVP Development
The first working version of your digital product.
Individual quote · based on project scope
Interactive Experiences
Web animation, Three.js, game interfaces and unusual digital experiences.
Individual quote · based on project scope
Website Redesign
Rethinking the structure, visuals and user path of an existing website.
Individual quote · based on project scope
Maintenance & Development
Support, bug fixing and further development of existing projects.
Individual quote · based on project scope
Tell me about your project.
All services
Sergey Endrass (Badin)
Software Developer · Full-Stack Developer · Digital Product Builder
04About
Sergey Endrass (Badin)
I am a software developer based in Kaufbeuren, Germany, building modern websites, full-stack applications and interactive web products.
After my practice-based training in software development and full-stack web development at neue fische, I have kept developing my own projects — work that brings together frontend, backend, databases, real-time communication, product design and deployment.
What interests me is less the individual technology than the question of whether a product actually works in the end: for the people using it, and for the goal behind it.
How I measure the work
A clear product
Every page and every feature has a reason. Whatever does not help does not ship.
Strong user experience
Understandable without explanation, fast on any device, operable by keyboard.
Dependable engineering
Strict TypeScript, clean separation of concerns, a deployment you can follow.
05Training
Practice-based training at neue fische
Practice-based training in software development and full-stack web development at neue fische. Building real applications with modern frontend and backend technologies — from the first product idea through to deployment.
The training was built around real development throughout: building your own applications, working in a team, delivering in agile workflows and presenting the results afterwards.
Instead of isolated exercises, the focus was on complete projects — with frontend and backend, database, authentication, testing and deployment.
- Building real applications
- Frontend and backend development
- Teamwork and agile workflows
- Presenting the products built
Practice-based professional training — not a university course and not an academic degree.
neue fische
What it covered
- Frontend
- HTML
- CSS
- JavaScript
- TypeScript
- React
- Next.js
- Backend
- Node.js
- NestJS
- REST APIs
- Authentication & Authorization
- Databases
- MongoDB
- Mongoose
- PostgreSQL
- TypeORM
- Quality & craft
- Responsive Web Design
- Accessibility
- Testing
- Workflow & collaboration
- Git
- GitHub
- Teamwork
- Agile Workflows
- Deployment
06Technologies
What I work with.
A deliberately narrow stack: TypeScript from the database all the way to the interface.
- 01Frontend
- HTMLCSSJavaScriptTypeScriptReactNext.jsTailwind CSSResponsive DesignAccessibility
- 02Backend
- Node.jsNestJSREST APIsAuthenticationWebSocketsSocket.io
- 03Databases
- PostgreSQLTypeORMMongoDBMongoose
- 04Development & tooling
- GitGitHubBunDockerJestSwaggerVercelCI Workflows
- 05Creative development
- Three.jsInteractive InterfacesWeb AnimationBrowser Game Concepts
07Currently building
What I am working on now.
Two products in active development. Not released yet — and deliberately marked as such here.
- In development
Digital Product · AI Companion
Your Shadow
A web-first companion for discipline, nutrition and daily goals.
- TypeScript Monorepo
- Next.js
- NestJS
- React
Case study
08Working together
How I work.
Five steps in which you always know where the project stands.
Step 1: First conversation
We talk about your business, your idea, your audience and the goal of the project. Afterwards we both know whether it is a fit.
Step 2: Strategy & concept
Structure, user path, technical solution and visual direction are decided — before anything gets built.
Step 3: Design & development
Interface and functionality take shape in steps you can follow, with versions to look at along the way.
Step 4: Testing & launch
Checking responsiveness, speed and accessibility — then going live.
Step 5: Ongoing development
After launch: support, improvements and new features as your project grows.
Next step
Tell me about your project.
A short message is enough. You will get an honest assessment of scope, process and options — with no obligation.
Usually answered within 24 hours on working days.
09Contact
Get in touch directly.
Use the form or reach out directly — whichever you prefer.
Available for
- Freelance projects
- Business collaborations
- Product development
- Full-stack opportunities
Kaufbeuren, Bavaria · working remotely or on site
Usually answered within 24 hours on working days.