Kim Kern
Lead Fullstack Node/React Developer
Experience
Nov 2023 - Jan 2024
3 monthsLead Fullstack Node/React Developer
Rytle
- Development of React.js / Next.js web application, displaying live sensor data and optimized routes on interactive maps.
- Architected and managed Node.js backend services in Docker containers integrated with Kafka, responsible for order management and routing.
- Guided and supported junior developers in their professional growth as team lead developer.
- Technologies: node.js, React, TypeScript, Postgres, Docker, Kafka, Github CI, ArgoCD
Nov 2021 - Apr 2023
1 year 6 monthsDeveloper for Microservice Logistics Platform
Leogistics
- Integrated real-time sensor data (AWS SNS/SQS) and created a scalable rule-based alerting system using Dapr.
- Established a lerna monorepo for internal npm packages with an automated Gitlab CI pipeline for semantic releases.
- Conducted performance analysis (node clinic) and refactoring/splitting of existing microservices.
- Technologies: nestjs, node.js, TypeScript, mongoDB, AWS, NATS, GitlabCI, Kubernetes, Dapr
Mar 2021 - Sep 2021
7 monthsEngineering Manager for React-Native App Features
Klarna
- Led the Form Filling team as the Competence Lead, responsible for technical design decisions, team meetings, and personal development of team members.
- Enhanced analytics/monitoring and defined KPIs across teams, leveraging domain knowledge.
- Defined domain standard for SLOs as member of the Operational Excellence Group.
- Technologies: React Native, node.js, TypeScript, Amplitude, Redux, Splunk, Datadog
Mar 2020 - Mar 2021
1 year 1 monthFull Stack Lead Developer for Web Automation APIs
Klarna
- Developed multiple backend services using Node.js, enabling advanced web automation capabilities for internal stakeholder teams.
- Built CLI tools and browser add-ons for data collection and generation, automated through a Jenkins pipeline.
- Integrated APIs into Klarna's React Native app and implemented metrics in Amplitude for monitoring successful go-live and ongoing operations.
- Technologies: node.js, TypeScript, Express, PostgreSQL, Puppeteer, Jest, Jenkins, AWS, Splunk
Feb 2020 - Mar 2020
2 monthsSocial Network Platform with Real-time Data
Linkbase
- Developed a progressive web app prototype, focusing on social networking with real-time data integration from a Firebase database.
- Collaborated closely with the product owner/designer, maintaining an agile development approach and incorporating direct feedback.
- Technologies: Angular, TypeScript, Angular Material, Firebase, Service Worker
Jan 2018 - Present
7 years 7 monthsFreelance Developer
- See list of recent projects below
- Main focus: node.js, React.js, TypeScript
Jan 2014 - Dec 2020
7 yearsSoftware Developer (part time)
Projektron GmbH
- Project management software
- Java, JS/TS, SQL, Postgres, Jenkins, Scrum
Personalized Fitness Schedule Web App
Open-source Project
- Created an interactive fitness schedule web app for a Berlin gym chain, with personalized settings and cross-device user accounts.
- Implemented as an offline-available progressive web app with a responsive Material UI layout, web push notifications, and a comments/feedback chat function.
- Technologies: Angular, Redux, Angular Material, node.js, koa.js, protractor, mongoose, TravisCI
Telegram Chat Bot for Price Notifications
Open-source Project
- Developed a Telegram chat bot for product update subscriptions and price change notifications from online stores.
- Features user account management, extensive unit test coverage, deployment to Heroku with TravisCI and a REST API documented with OpenAPI.
- Technologies: nest.js, node.js, express.js, TypeScript, jest, MongoDB, typeorm, OpenAPI, Heroku
Community Contribution
Stack Overflow
- Actively contributed to Stack Overflow, continuously improving skills with a particular focus on the nestjs framework.
- Currently #2 top contributor for nestjs.
Languages
German
Native
English
Advanced
Education
Freie Universität Berlin
Master of Science · Computer Science · Berlin, Germany · 1.2 (A)
Freie Universität Berlin
Bachelor of Science · Computer Science · Berlin, Germany · 1.3 (A)
Reuchlin Gymnasium Pforzheim
Abitur · Pforzheim, Germany · 1.1 (A+)
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