Collin K.-Lead Fullstack Developer
Check rate
Experience
Software Architect / Fullstack Developer
Equity Bytes
Built an international e-commerce platform for a multi-vendor marketplace for digital assets from scratch. Designed and operated cloud native architectures at enterprise scale.
- Designed and operated a highly scalable microservice and serverless architecture
- Built the complete cloud infrastructure with Terraform + AWS CDK in AWS
- Provisioned ECS/EKS clusters (Fargate), Application Load Balancers (reverse proxy), and Lambda functions
- Observability & tracing with CloudWatch, DataDog, Prometheus, and Grafana
- End-to-end setup with DataDog (formerly AWS CloudWatch), Prometheus, and custom Grafana dashboards
- Integration of advanced metrics (including ORM mapper) and distributed tracing with Jaeger
- Robust backup and disaster recovery strategies
- RDS Postgres backups and hourly snapshots
- Read-only, asynchronously synchronized replicas with automated master failover in emergencies
- Minute-level rollback capability through versioned Docker images on ECS and Git-based CI/CD pipelines
- Created CI/CD pipelines with GitHub Actions for automated multi-stage deployments (Dev, Testing, Prod)
- Integrated Stripe for international payment processing
- Built a marketplace payment system with multiple parties and payout routines
- Used Algolia for high-performance real-time search of digital assets on the platform
- Federation of services with GraphQL and Hasura
- Later migration to GraphQL Mesh
- Test Driven Development (TDD) - unit, integration, and E2E testing with Jest, Vitest, and Playwright
- Used Next.js / React for modern frontend applications in the nx monorepo
- Enterprise security architecture & access control
- Integration of JWT tokens with Auth0, OAuth, OIDC, IP guards, BOLA protection, and secret vaults
- Authorization concepts with RBAC, ABAC, and native Postgres Row-Level Security (RLS)
- Built internal microfrontends with Retool for fast prototyping and operational business processes
Technologies: ABAC, AWS CDK, AWS CloudWatch, AWS ECS, AWS EKS, AWS Fargate, AWS RDS, AWS S3, Algolia, Auth0, DataDog, Docker, GitHub Actions, Grafana, GraphQL, GraphQL Mesh, Hasura, JWT, Jaeger, Java, JavaScript, Jest, Kotlin, Kubernetes, Monorepo, Next.js, OIDC, Playwright, Postgres, Postgres RLS, Prometheus, RBAC, Redis, Retool, Serverless, Stripe, Terraform, TypeScript, Vitest
Software Architect / Fullstack Developer
IU GmbH
Migration of an existing policy administration system from a PHP monolith to a Node.js event-based microservice architecture, as well as integration of services into a streaming data ecosystem.
- Successful migration of an existing policy administration system from a PHP monolith to a Node.js event-based microservice architecture
- Integration of services into a streaming data ecosystem
- Development of cloud native applications
- Designed and operated a streaming data architecture with Next.js, Express, MySQL, Redis, Kafka (with JSON Schemas), and Docker
- Created CI/CD pipelines (DevOps processes) in Bitbucket for automated application deployment
- Provisioning and multi-stage deployments via AWS CloudFormation
- Built Docker containers for AWS ECS/EKS clusters (with Fargate)
- Tested and evaluated new technologies for more stable / faster / more secure / more sustainable application development
- Used Domain Driven Design in the area of our own bounded contexts
- Presented results to stakeholders / led internal meetings
- In-depth discussions of micro and macro architecture decisions in the IT landscape
- Advised internal staff on implementing business and technical requirements
- Created architectural design proposals for software developers
- Unit / integration / E2E testing with Jest, Cypress
- Used Vue.js (with SASS/SCSS) for frontend applications
- Built and designed various AWS Grafana dashboards and CloudWatch monitoring to show metrics from different services
- Distributed tracing with Jaeger for latency analysis and performance optimization of distributed services
- Implemented an internal component library / styling guides for Vue.js
- Used message queues for app-internal communication
- Orchestrated multiple micro-frontends into one app
Technologies: AWS CloudFormation, AWS CloudWatch, AWS EC2, AWS ECS, AWS EKS, AWS Fargate, AWS IAM, AWS Lambda, AWS RDS, AWS S3, Bitbucket CI, Cypress, Docker, Domain Driven Design, Express, Grafana, JSON Schema, Jaeger, JavaScript, Jest, Kafka, Message Queues, Micro-Frontends, MySQL, Nest.js, Prometheus, Redis, SAFe, SASS, SCSS, TypeScript, Vue.js
Lead Fullstack Developer / Interim PO
freeyou AG
Built the insurance startup from scratch. Technical lead for data engineers and DevOps teams in the design of modern insurance products and cloud infrastructures.
- Supported and technically built up the InsurTech startup from day one
- Developed cloud native applications (including Jamstack with Vue.js/Nuxt.js and Fastify backend on AWS Lambda)
- Designed and operated a highly scalable streaming data architecture on Apache Flink, Kafka (with AVRO Schemas), and Cassandra
- Built and operated the cloud infrastructure on AWS with AWS CDK (TypeScript) and Terraform
- Provisioned serverless Lambda functions, ECS clusters (Fargate), reverse proxies (ALB + ELB), and EC2 instances
- Automated configuration of EC2 instances with Packer and provisioning via Ansible
- Built Docker containers for AWS ECS/EKS clusters (with Fargate)
- Central logging and monitoring with AWS CloudWatch, DataDog, and Grafana (plus Prometheus), including advanced ORM metrics
- Designed backup and disaster recovery strategies (RDS snapshots, asynchronous read replicas, versioned rollbacks)
- Integrated headless web scrapers (Serverless / AWS Lambda with Puppeteer) and proxy rotator services
- Created CI/CD pipelines in GitLab for automated multi-stage deployments (Dev, Testing, Prod)
- (Unit/Integration/E2E) testing with Jest, Cypress, JUnit, Mocha, Jasmine, Selenium, and Puppeteer
- Supported actuarial teams with data collection, preparation, and analysis
- Led the team on the business side in an interim Product Owner role and managed data and DevOps engineers
- Designed and implemented privacy and IT security requirements in close collaboration with the data protection officer
- Created / prototyped chatbots
- Rasa NLU prototype
- Ebot-7 in production
- Tested and evaluated new technologies for more stable / faster / more secure / more sustainable application development
- Presented results to stakeholders and led internal meetups
- Used Python with Apache Airflow for ETL jobs
Technologies: AWS CDK, AWS Certificate Manager, AWS CloudWatch, AWS EC2, AWS ECS, AWS EKS, AWS Fargate, AWS IAM, AWS Lambda, AWS RDS, AWS Route53, AWS S3, Amazon API Gateway, Amazon CloudFront, Ansible, Apache Avro, Apache Flink, Apache Kafka, Cassandra, Cypress, DataDog, Docker, Ebot-7, Fastify, GitLab CI, Grafana, GraphQL, JUnit, Jasmine, Java, JavaScript, Jest, Kafka Managed Service, Kotlin, Mocha, Nuxt.js, Packer, Prometheus, Proxy Rotator, Puppeteer, Python, Rasa NLU, SASS, SCSS, Selenium, Serverless, Terraform, TypeScript, Vue.js
Fullstack Developer
DEVK Versicherungen
Migration of legacy systems and development of business applications in the life insurance area.
- Migration of legacy systems (Cobol to Java/Kotlin)
- Implementation of online frontends with Java/Kotlin/Thymeleaf
- Implementation of business requirements for Spring batch jobs (life)
- Customizing LifeFactory interfaces (life)
- Organization and support of student internships / dual study students
- Integration / maintenance of Spring Batch applications
- Integration of manual into automated processes
- Creation of CI/CD pipelines with Jenkins
Technologies: Apache Tomcat, Cobol, JBoss, Java, Jenkins CI, Kotlin, LifeFactory, SQL, Spring Batch, Spring Boot, Thymeleaf
Trainee
DEVK Versicherungen
Rotated through different departments as part of the IT specialist apprenticeship.
- Worked through different teams to understand the DEVK world
- Rotation through various company departments
- Software development with Cobol / PL1
- Maintenance of Java-based web/batch applications
- Creation and maintenance of a goal-setting platform for internal employees
- Creation of CI/CD pipelines with Jenkins
Technologies: Apache Tomcat, Cobol, JBoss, Java, Jenkins CI, PL1
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Insurance, Information Technology, Retail, and Education.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Project Management, and Operations.
Summary
I build cloud native applications from end to end and focus on making complex platforms stable, secure, and easy to evolve. My work spans fullstack development, software architecture, and technical leadership, with hands-on experience in microservices, streaming data, and AWS infrastructure.
I work with Nest.js, Next.js/React, Vue.js, GraphQL, Kafka, MySQL, Redis, Docker, and Terraform, and I set up CI/CD pipelines with GitHub Actions, GitLab, Bitbucket, and Jenkins. I have built marketplace platforms for digital assets, integrated Stripe for international payments, implemented real-time search with Algolia, and designed security mechanisms with Auth0, OAuth, and OIDC.
I also bring experience from the insurance domain, including legacy migration, batch processing, data collection and analytics, chatbot prototyping, and close collaboration with stakeholders and internal teams.
Skills
- Node.Js
- Vue.Js
- Serverless
- Aws
- Kafka
- Spring
- Apache Avro
- Schema Registry
- Apache Flink
- Gitlab-Ci
- Relational Db
- Angular
- Cassandra
- Javascript
- Java
- Terraform
- Typescript
- Next.Js
- React
- Algolia
- Sql
- Packer
- Python
- Hasura
- Graphql
- Rest
- Github Actions
- Ansible
- Rust
- Bitbucket Ci
- Jenkins
- Message Queues
- Json Schema
- Sass/ Scss
- Management
- Agile Working
- Product Owner
- Scrum Master
Languages
Education
European University of Applied Sciences
M.Sc. Business Informatics · Business Informatics
Udayana University
Semester Abroad · Business Administration · Indonesia
European University of Applied Sciences
B.Sc. Business Informatics · Business Informatics
Certifications & licenses
Claude Code in Action
Anthropic
Learn Rust From Scratch
educative
AWS Cloud Practitioner Essentials
AWS Training & Certification
Cambridge Business English Certificate C1
Google Online Marketing Certificate
Statistics
Experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Collin is based in Kempen, Germany and can operate in on-site, hybrid, and remote work models.
Collin speaks the following languages: German (Native), English (Advanced).
Collin has at least 12 years of experience. During this time, Collin has worked in at least 4 different roles and for 4 different companies. The average length of individual experience is 2 years and 5 months. Note that Collin may not have shared all experience and actually has more experience.
Based on recent experience, Collin would be well-suited for roles such as: Software Architect / Fullstack Developer, Lead Fullstack Developer / Interim PO, Fullstack Developer.
Collin's most recent position is Software Architect / Fullstack Developer at Equity Bytes.
In recent years, Collin has worked for Equity Bytes, IU GmbH, and freeyou AG.
Collin is most experienced in industries like Insurance, Information Technology, and Retail. Collin also has some experience in Education.
Collin is most experienced in business areas like Information Technology, Product Development, and Project Management. Collin also has some experience in Operations.
Collin has recently worked in industries like Insurance, Information Technology, and Retail.
Collin has recently worked in business areas like Information Technology, Product Development, and Project Management.
Collin holds a Master in Business Informatics from European University of Applied Sciences, a Bachelor in Business Administration from Udayana University, a Bachelor in Business Informatics from European University of Applied Sciences and a Bachelor in Application Development from Adolf-Kolping-Berufskolleg.
Collin has 6 certificates. Among them, these include: Claude Code in Action, Learn Rust From Scratch, and AWS Cloud Practitioner Essentials.
Collin is immediately available full-time for suitable projects.
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Calculated based on our freelancers’ daily rates as of 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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