Node.js Experts in Cologne

Hooman Behmanesh

Fullstack Developer

Last position:

Fullstack Developer at Möbel Roller GmbH

Further development of the existing e-commerce platform based on SAP Commerce (Hybris) to meet the growing demands of digital commerce.
Ensuring the scalability and performance of the backend, so the platform remained stable and efficient even under heavy user load.
Development and integration of new OCC REST APIs and services for modular extensions and flexible adjustments, to implement new features quickly.
Optimization of data flows and interfaces, which significantly improved platform efficiency and system performance.
Ensuring a maintainable and scalable code base by using Clean Code principles, proven design patterns, and a future-proof architecture.
Reduction of errors through extensive testing with JUnit, Mockito, and load tests with Gatling, supported by the introduction of automated test processes.
Improved system performance through targeted refactoring measures and efficient database queries, especially to handle peak loads.
Use of modern cloud and monitoring tools such as Kubernetes, Google Cloud Platform (GCP), and Grafana to ensure a stable and monitored infrastructure.
Clear improvement in efficiency, scalability, and reliability of the platform, which now meets the demands of a dynamic and growing e-commerce market.

Christoph Sawicki

Test Manager

Last position:

Test Manager at Logistics

Coordination and planning, execution, documentation, and analysis of test cases
Development of test concepts considering best practices (e.g., test pyramid) with a focus on reliable, automatable test runs
Implementation and maintenance of test cases according to the test concepts
Technologies: Citrix Workspace, Shopify, Jira, Xray, MS Teams, MS SharePoint, Confluence, MS Office 365

Piet Althoff

Senior Product Engineer / Automation Developer

Last position:

Founder at RubberMetrics.com

Self-hosted table tennis equipment platform.
Development of a custom “Racket Builder” that uses a co-evolutionary genetic algorithm to identify, evaluate, and recommend the optimal combinations of racket blades and rubbers based on physics heuristics and player data within a search space of over 4 billion combinations.
Development of a custom fully automated web crawler to capture equipment specifications, integrating an automated pipeline for image normalization as well as data harmonization via DeepSeek.
Cloudflare Edge Workers written in Rust to perform low-latency data searches and offload computationally intensive simulations from the main server.
High performance and accessibility standards across a large Nuxt 4 codebase achieving 95–100/100/100 Lighthouse scores.

Marc Smyk

Fullstack Engineer | Java & Spring Boot | Angular | System Integration

Leverkusen

Last position:

Fullstack Developer at PLANT-MY-TREE

PLANT-MY-TREE®-per-order

The application enables Shopify merchants to automatically place tree-planting orders for every incoming order. By integrating ecological contributions directly into the purchase process, the manual effort for tracking and billing reforestation initiatives is eliminated. The system increases transparency for end customers through real-time visualizations of the ecological impact directly in the storefront. The architecture is based on a modular monolith with Spring Boot in the backend and an integrated React app inside the Shopify admin area. The solution uses webhooks to capture order data in an event-driven way and integrates the weclapp ERP system for automated monthly invoicing. An app proxy mechanism provides dynamic statistics such as CO2 compensation and planted trees without any performance loss for the merchant shop.

Tasks:

Design of the modular software architecture based on Spring Modulith to ensure high maintainability
Development of the event-driven business logic for evaluating Shopify orders via webhooks
Implementation of automated invoicing by connecting the weclapp REST API
Building the frontend using React Router and Shopify App Bridge for native integration
Design of the database model and implementation of the persistence layer with JPA/Hibernate and Prisma
Integration of internationalization processes for global use in the frontend and email communication
Automation of deployment processes using Docker and GitLab CI/CD

Project skills: Java 25, Spring Boot, Spring Security, Spring Modulith, Hibernate, JPA, REST API, PostgreSQL, Maven, Liquibase, React, TypeScript, React Router, Vite, Node.js, Prisma, Zod, Docker, Docker Compose, GitLab CI/CD, Shopify CLI, Shopify App Bridge, Polaris, weclapp, i18next, Lombok, Vitest

Sophia Wagner

AI Engineer & Technical Consultant

Last position:

AI Engineer & Technical Consultant at Freelance

Delivered ML pipelines for OCR, semantic search, and computer vision
Integrated Azure AI Agents and GPT workflows for automation and QA
Deployed cloud-based FastAPI services with scalable architecture
Created integration docs and advised on LLM production readiness

Thomas Pawlitzki

Freelance Software Architect

Last position:

Freelance Software Architect at Self-employed

Christian Hunkirchen

Developer

Bonn

Last position:

Developer at Opereon Consulting GmbH

Developed a shop website
Integrated an AI language model
Developed tools for AI-powered webhooks
Technical tools: REACT.js; Elevenlabs; MCP; n8n; HTTP

Jens Hagemeyer-Lee

#52 Test Manager in Safety-Critical Infrastructure

Last position:

#52 Test Manager in Safety-Critical Infrastructure at Telecommunications Company

Network elements, network, operational and operator-related systems
Supporting around 20 different products (managed agile)
Requirements analysis and management (functional and non-functional)
Test concept and planning (scope, test phases, effort, schedule, resources, organization, etc.)
Aligning approach with clients and service providers
Managing and assisting in creation of test cases for system, integration and end-to-end tests
Guiding and supporting test execution
Defect management and planning bug fixes with external providers
Preparing and facilitating workshops
Regular reporting and creating automated test reports
Further development of agile testing methodology and configuration of supporting tools
Conceptual support in developing a quality seal for rating product and service quality of internal and external providers
Requirements engineering based on ISO/IEC 25010, Scrum, SaFE
BMC Remedy, Atlassian Confluence, Atlassian Jira (including plugins Xray, Structure), Microsoft Office (incl. Visio), Obsidian, doxis document management system, Gitlab, Obsidian

Stanislav Stolberg

Senior IT Consultant and Digitalization

Last position:

Interim CTO / IT Consultant (Cloud & App Security · AI & Web3) at Deutsche Bank Group; Startups

Spearheaded strategic and operational oversight of IT infrastructures to accelerate innovation and ensure audit-proof delivery.
Acted as key liaison between management, business departments, and engineering, actively engaging in coding, cloud architecture, and CI/CD to resolve critical path challenges.
Engineered and implemented an AI Governance Program to manage risks and ensure compliance with the EU AI Act, reducing AI use-case approval times from 8 to 3 weeks.
Delivered and deployed secure AI systems into production (RAG-based knowledge platforms), resulting in a 35% decrease in standard support ticket volume.
Established robust security standards and governance frameworks for APIs (OAuth2/OIDC, mTLS) and cloud platforms (AWS/GCP) to guarantee compliance and system integrity.
Hardened cloud infrastructure by implementing Zero Trust principles and a comprehensive observability stack (logging/alerting), achieving 99.9% availability in a 24/7 on-call environment.

Florian Rubel

Senior Fullstack Developer

Last position:

Senior Fullstack Developer at Ivii GmbH

Two-month modernization of the management UI for AI-powered cameras
Rewrote a complex React application to Vue 3 with single file components
Set up the core architecture of the Vue application and configured Vite, Pinia, Router, I18n, ESLint, and Prettier
Custom integration of Leaflet to display detection zones on images
Assisted with backend extension and authentication adjustments

Hans Reinl

Engineering and Leadership Consultant

Last position:

Engineering and Leadership Consultant at Self-employed

Leveraging 15+ years of high-scale platform architecture and engineering leadership to consult with companies, focusing on enhancing their engineering capabilities and accelerating adoption of the AI-native web.

AI & Machine Learning: Hands-on architecture and implementation using Vercel AI SDK, Next.js, Supabase, and Serverless architectures to build production-ready AI applications.
Reference Architecture: Designed and implemented a full-stack, conversational coach (N+One AI Coach) based on Next.js and Vercel Edge Network for personalized training, demonstrating expertise in performant serverless applications and AI-powered experiences.
Agentic Systems & Data Processing: Developed agentic-led, low-code crawling and indexing processes for fiber internet network information, showcasing proficiency in automation, LLM integration, and data structuring.

Sebastian Thees

Software Engineer / Cloud Engineer

Bonn

Last position:

Software Engineer / Cloud Engineer at OC Fulfillment GmbH

Hybrid role as the first software engineer in the company to bootstrap the organization, laying out technical foundation and advising management on organizational aspects.
Set up the SaaS platform architecture, selected languages and tools, and designed processes to deliver customer value quickly and reliably.
Designed and implemented build and continuous deployment pipeline with multi-tenant approach enabling extreme scaling of the SaaS platform.
Established initial ITSM and support processes, provided monitoring and alarming, and participated in the on-call team.
Proposed new approaches to scale the platform and improve backend interfaces to mitigate bugs and communication overhead.
Mentored new employees and served as a trustful team member and lateral leader.
Conducted interviews for technical roles.
Used technologies: Typescript, Node.js, Bash, Google Cloud Platform (App Engine, Cloud Run, Cloud Functions, Google Endpoints, Firebase), GitHub Actions, Docker, Terraform, MongoDB, Firebase, REST APIs, GraphQL.

Cedric Jacob

Co-Founder / CTO

Siegburg

Last position:

Co-Founder / CTO at Infinite Hooray ApS

Develop powerful add-ons for customer service systems with innovative Zendesk apps designed to drive business growth, improve efficiency, and enhance customer satisfaction
Implement full Zendesk solutions and provide hands-on support to bring customer service vision to life
Combine customer service and technology expertise to address the complexities of delivering top-notch customer service
Execute Zendesk implementations in 20+ countries and develop AI apps that automate replies
Maintain a proven track record of success in advancing customer service capabilities

Jacqueline Haefke

Düsseldorf

Last position:

Kitchen Appliance Manufacturer

Setting up and enhancing an international subscription management system
Migrating and decommissioning a Hybris-SAP system and integrating Zuora
Implementing numerous interfaces to various systems (external and internal)
Setting up and improving monitoring with Grafana, Prometheus, and Databricks
Introducing logging with Loki
Implementing business requirements using jQuery, Thymeleaf, Spring Boot, Java, Go, and Python
Adjusting and extending the GitLab CI pipelines
Setting up and extending infrastructure as code with Terraform and ArgoCD on AWS
Setting up and running E2E and performance tests
Expanding the Databricks business intelligence solution to provide various KPIs
Responsibilities: Architecture, DevOps, development, unit tests, coaching employees and apprentices, E2E, smoke, and integration tests, agile methods consulting (Kanban, Scrum)
Technologies and methods: Java, Go, Kotlin, Node.js, Spring Boot, SOAP/REST, Quarkus, Thymeleaf, Vaadin, Slack, Jira, Confluence, IntelliJ, GitLab, SQS, Kafka, AWS, Kubernetes, Terraform, Maven, Gradle, GitLab CI, Databricks

Andreas Beckers