Collin Kempkes - Lead Fullstack Developer

Mönchengladbach, Germany

Experience

Jan 2023 - Present

3 years 1 month

Development of cloud native applications to provide a multi-vendor marketplace for various digital assets (e.g., NFTs)
Design and operation of a microservice architecture using Nest.js, MySQL, Redis, Hasura, Algolia, Docker, and Serverless
Design and operation of a streaming data architecture using Kafka (with JSON Schemas)
Creation of CI/CD pipelines with GitHub Actions for automated application deployments
Testing and evaluation of new techniques for more stable, faster, secure, and sustainable application development
Setup of the entire infrastructure on AWS using Terraform
Integration of Stripe to manage international payments
Use of Algolia for real-time search of digital assets on the platform
Presentation of results to stakeholders and hosting internal meetups
Federation of services with GraphQL and Hasura
Discussion of architectural decisions in the IT landscape and their impacts
Use of message queues for in-app communication and component encapsulation
Advising internal staff on implementing business and technical requirements
Test Driven Development: unit, integration, and end-to-end testing using JUnit
Use of Next.js/React with SASS/SCSS for frontend applications
Use of Vue.js with SASS/SCSS for frontend applications
Integration of security-related mechanisms (JWT tokens with Auth0, OAuth, OIDC, IP guards, BOLA, secret vaults)
Creation of microfrontends with Retool for rapid prototyping and functionality testing
Use of nx monorepo with nrwl

Mar 2022 - Dec 2022

10 months

Development of cloud native applications to provide a multi-vendor marketplace for various digital assets (e.g., NFTs)
Design and operation of a microservice architecture using Nest.js, MySQL, Redis, Hasura, Algolia, Docker, and Serverless
Design and operation of a streaming data architecture using Kafka (with JSON Schemas)
Creation of CI/CD pipelines in Bitbucket for automated application deployments
Testing and evaluation of new techniques for more stable, faster, secure, and sustainable application development
Setup of the entire infrastructure on AWS using Terraform
Integration of Stripe to manage international payments
Use of Algolia for real-time search of digital assets on the platform
Presentation of results to stakeholders and hosting internal meetups
Federation of services with GraphQL and Hasura
Discussion of architectural decisions in the IT landscape and their impacts
Use of message queues for in-app communication and component encapsulation
Advising internal staff on implementing business and technical requirements
Test Driven Development: unit, integration, and end-to-end testing using JUnit
Use of Next.js/React with SASS/SCSS for frontend applications
Use of Vue.js with SASS/SCSS for frontend applications
Integration of security-related mechanisms (JWT tokens with Auth0, OAuth, OIDC, IP guards, BOLA, secret vaults)
Creation of microfrontends with Retool for rapid prototyping and functionality testing
Use of nx monorepo with nrwl

Jun 2018 - Mar 2022

3 years 10 months

Development of cloud native applications
Design and operation of a streaming data architecture on Flink and Kafka (with AVRO schemas) and Cassandra
Support of the actuarial department in data collection, processing, and analysis
Operation and maintenance of the cloud infrastructure on AWS
Integration of web scrapers (Serverless/AWS Lambda)
Design and implementation of data protection and IT security in collaboration with the data protection officer
Technical lead of data engineers and DevOps engineers
Functional team leadership as an interim product owner
Creation of CI/CD pipelines in GitLab for automated application deployments
Creation and prototyping of chatbots: Rasa NLU prototype and Ebot-7 production application
Testing and evaluation of new techniques for more stable, faster, secure, and sustainable application development
Presentation of results to stakeholders and hosting internal meetups
Unit, integration, and end-to-end testing using JUnit, Cypress, Selenium, and Puppeteer
Use of Vue.js and Angular with SASS/SCSS for frontend applications
Use of GraphQL to interact with the backend