Web applications that carry real business weight.

Internal tools, built to fit — order platforms, sales analytics, dispatch boards, AI workflows. Each built for a process that standard software does not cover, and maintained once it is live. Frontend, backend and deployment are handled in one place.

Discuss a project See selected work
8+
years shipping software
10
production projects
9
industries served
DE / EN
German native, English C1
Travel Chemical industry Automotive Logistics Construction Performance marketing Manufacturing Sports Productivity
01

What I do

Custom web applications

Internal tools, portals and platforms built from scratch — Angular or React on the front, NestJS or Spring Boot behind it.

Dashboards & data views

Complex data made usable: large tables, charts, interactive maps, live updates over WebSockets.

APIs & integrations

REST and GraphQL services, microservices, documented with OpenAPI — plus SAP, Mapbox, payment and AI provider integrations.

Taking over existing code

Inherited a codebase nobody maintains? I do framework upgrades, refactoring, test coverage and CI/CD cleanup.

02

Tech stack

The tools I use daily. Hover a tile to see where I've used it.

Frontend

  • Angular
  • React
  • React Native
  • TypeScript
  • JavaScript
  • Tailwind CSS
  • SCSS / CSS3
  • HTML5
  • RxJS
  • Next.js

Backend

  • NestJS
  • Spring Boot
  • Node.js
  • Java / Kotlin
  • GraphQL
  • PostgreSQL
  • MariaDB
  • OpenAPI

Infrastructure & quality

  • Docker
  • Azure
  • AWS
  • CI/CD
  • Cypress
  • Jest
  • Nx Monorepo
  • Git / GitHub
03

Selected work

Client names stay confidential. Filter by what you need.

Sales analytics platform

Automotive

Building and maintaining an analytics platform for international markets: Spring Boot REST APIs, a global design system, dark mode, multilingual UI, admin CMS and microservice rollout on Azure and AWS.

  • Angular
  • Spring Boot
  • PostgreSQL
  • Hibernate
  • Tableau
  • Docker
  • AWS

Supply-chain risk module

Automotive

A risk management module inside an existing procurement analytics app: AG Grid dashboards for complex risk data, Google Maps for high-risk regions, SAP-backed queries.

  • Angular
  • AG Grid
  • SAP integration
  • Jenkins
  • Cypress
  • Jest

Digitizing a drywall company

Construction

Built from zero: dashboards, a document management system, a live construction ticker over WebSockets, schedule visualization and time tracking — Angular and Spring Boot on MariaDB.

  • Angular
  • Spring Boot
  • MariaDB
  • WebSockets
  • ApexCharts
  • GitLab CI/CD

Cruise sales application

Travel

A scalable sales platform for a cruise provider: interactive route maps, a standalone CMS so non-technical staff can publish content, and microservices hosted on Azure.

  • Next.js
  • React
  • Tailwind
  • TypeScript
  • Mapbox
  • Azure
  • OpenAPI

B2B e-commerce platform

Chemical industry

A large-scale purchasing platform for a chemical corporation across multiple markets — Angular frontend, NestJS microservices, a redesigned component library, E2E tests and faster CI/CD.

  • Angular
  • NestJS
  • Nx
  • Docker
  • Cypress
  • Highcharts
  • Azure DevOps

AI advertisement analysis tool

Performance marketing

AI pipelines analysing Meta Ads video, image and text via Gemini, OpenAI and Whisper, with the results visualized for marketers. Prompt tuning, tRPC routers, reusable UI.

  • Next.js
  • tRPC
  • OpenAI
  • Gemini
  • Meta Insights API
  • Tailwind

Bouldering competition system

Sports

Event, team and live-result management for climbing gyms: an Angular component library, GraphQL against NestJS, real-time results and PWA offline support.

  • Angular
  • NestJS
  • GraphQL
  • Nx
  • Docker
  • PWA

Dispatch planning tool

Logistics

Fleet scheduling with drag-and-drop shipment allocation, real-time updates over WebSockets and dashboards for driver utilization.

  • Angular
  • Spring Boot
  • WebSockets
  • ApexCharts
  • Kotlin

Time management app

Productivity

An Angular app set up from scratch: chronological calendar view, reusable task components and NgRx state with recurring tasks persisted locally.

  • Angular
  • NgRx
  • PrimeNG
  • RxJS
  • date-fns

Android sensor localization app

Manufacturing

A mobile app locating and monitoring Bluetooth sensors in production equipment, with signal-strength visualization for proximity and live data from a Spring Boot backend.

  • Android
  • Kotlin
  • Java
  • BLE
  • Spring Boot
  • REST
04

Let's talk

Describe what you need in a few sentences. A reply follows within two working days with an honest read on scope, effort and fit.

mail@saschariemann.com