Jan Krüger
Software Developer at Lime Connect (formerly Userlike)
Aachen, North Rhine-Westphalia, Germany
Summary
🤩
Rockstar🎓
Top SchoolJan Krüger is a software developer with nine years' experience building resilient, high-performance backend systems and improving operational reliability, currently leading backend development at Lime Connect (formerly Userlike) in Aachen. He specializes in pragmatic architecture decisions, performance tuning, and security for scenarios where standard cloud services fall short, and has implemented internal services handling hundreds of requests per second with sub-millisecond latencies. Equally comfortable across the full stack, Jan contributes to open-source (including NestJS GraphQL federation samples) and codes in Go, TypeScript, React/Angular, and Kubernetes-based deployments. He thrives on solving the hardest incidents—having dug into PostgreSQL and Django internals when needed—and prefers roles that demand deep technical problem-solving rather than mere headcount increases.
9 years of coding experience
5 years of employment as a software developer
Artificial Intelligence, Artificial Intelligence at Maastricht University
German, English
Stackoverflow
836reputation
36kreached
14answers
5questions
nestjs
top-5%
jwt
top-5%
Github Skills (24)
application-framework10
javascript10
app-framework10
typescript10
wpgraphql10
nestjs10
wordpress-graphql10
typescript-types10
graphql10
web-framework10
nodejs10
typescripts10
testing9
microservices-application9
jwt9
Programming languages (14)
Github contributions (5)
nestjs/nest
Jul 2021 - Jul 2021
A progressive Node.js framework for building efficient, scalable, and enterprise-grade server-side applications with TypeScript/JavaScript 🚀
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 reviews, 8 commits, 4 PRs in 1 day
Contributions summary:Jan contributed to the documentation and sample applications related to GraphQL Federation in the NestJS framework. Their changes focused on code-first and schema-first approaches, with specific implementations for posts and users applications, including resolver and service code. They also touched upon end-to-end testing of the application and added changes in the gateway and application configuration. The user also fixed directory naming conventions for GraphQL federation samples.
javascriptnodejs-frameworkserver-sidetypescriptnest
Flusinerd/SmartChef
Mar 2022 - Jun 2022
Contributions:10 reviews, 166 commits, 22 PRs in 2 months
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