Open to opportunities

Sebastian Wahn

@sebastianwahn

What I'm looking for

I am seeking a senior backend or architect role in a collaborative, engineering-driven company where I can design scalable cloud-native systems, mentor teams, and drive automated, test-first delivery.

I’m a Senior Software Engineer and iSAQB CPSA-F certified Software Architect with a B.Sc. in Computer Science. I build cloud-native backend systems and microservices with a strong focus on AWS/serverless, Kotlin/Spring Boot, and Node.js/TypeScript—covering everything from API design to CI/CD, testing, and operations. I’ve delivered production systems in regulated and high-scale contexts (e.g., banking), and I’m particularly strong in integrating third-party APIs such as Stripe. Based in Germany, available for remote projects.

Experience

Work history, roles, and key accomplishments

Current

Backend Engineer

Current

Edekabank AG

Mar 2024 - Present (1 year 11 months)

Design, develop, and maintain scalable backend services and cloud-integrated systems using Kotlin and TypeScript, improving reliability and deployment automation with Terraform and Docker.

Kotlin Spring Boot TypeScript GCP Docker Terraform PostgreSQL Redis

Software Architect

CGIBackgrounds

Jan 2020 - Dec 2025 (5 years 11 months)

Architected and developed a cloud-native AWS platform and backend for managing HDRi assets, implemented import pipelines, thumbnail generation, and Stripe-based subscription handling.

AWS Lambda NodeJS TypeScript Serverless DynamoDB Stripe AWS CDK Terraform

Backend Engineer

Deutsche Bahn AG

Jun 2023 - Feb 2024 (8 months)

Developed and maintained a Node.js backend delivering KPI data via REST, implemented unit and integration testing pipelines, and refactored for improved testability and simplicity.

NodeJS PostgreSQL Jest Redis JWT Test Driven Development

Fullstack Engineer

MHP

Sep 2021 - Mar 2023 (1 year 6 months)

Built and maintained a vehicle information system ingesting Kafka streams, refined data to avoid persistence of unnecessary records, and developed a new streaming integration to replace long polling.

Java Spring Kafka SQL Splunk Caching Test Driven Development

Backend Engineer

MHP

Jan 2021 - Sep 2021 (8 months)

Designed and implemented a rule-engine microservice for an online car configurator using NestJS and Google Cloud Functions to validate user configurations against imported boolean-rule sets.

NodeJS TypeScript NestJS Google Cloud Functions Terraform SQL Microservices Unit Testing

Consultant

MHP

Aug 2019 - Dec 2019 (4 months)

Performed business process analysis, identified missing information in tooling and communications, and documented processes with BPM diagrams to improve cross-department workflows.

Business Process Analysis Enterprise Architect BPM Stakeholder Management

Software Architect

Mackevision

Jul 2016 - Jun 2019 (2 years 11 months)

Architected and developed a cloud-native platform for high-quality imagery generation using AWS, scalable EC2 rendering instances, and streaming previews to browsers via WebSockets.

AWS EC2 Load Balancing NodeJS Java Spring Boot Terraform WebSockets

Backend Developer

hydra newmedia GmbH

Nov 2015 - Jun 2016 (7 months)

Developed REST microservices in Node.js for a vehicle inventory system, integrated external APIs, and implemented webhooks and search functionality using ElasticSearch.

NodeJS TypeScript REST APIs MongoDB Elasticsearch JWT Test Driven Development

Web Developer

Synergetic Agency AG

Oct 2013 - Oct 2015 (2 years)

Developed and maintained PHP e-commerce applications, built a C# PIM with REST APIs and an AngularJS frontend, and created an Electron-based newsletter layout tool.