Patrick Lenert

GenAI Fullstack Freelancer

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Valencia, Spain

Experience

Jan 2025 - Present
1 year 1 month
Valencia, Spain

GenAI Fullstack Freelancer

Palema

  • Techstack: Next.js, React, Typescript, ChromaDB, Embedding Models, OpenAI API
  • Developed an AI-based matching system for a recruiting company for targeted candidate search in over 370,000 LinkedIn profiles
  • Architected Next.js frontend, ChromaDB as vector database, BGE-ICL for embeddings and GPT-4.1 for semantic search via tool calls
  • Automated manual pre-selection to enable finding qualified candidates in seconds
  • Managed three Linux Ubuntu servers for clients with open source software based on Docker containers
Sep 2024 - Dec 2024
4 months

Senior Fullstack Developer

Orbit Ventures (Hays)

  • Techstack: Nuxt, Vue 3, Typescript, Azure Postgres, Azure Web App Service, Azure Functions
  • Further developed a Nuxt web application with Vue 3 as part of an A/B testing project
  • Implemented three versions with random traffic distribution
  • Developed numerous Nuxt pages and reusable Vue components
  • Used Azure Postgres database and Azure Deployment Slots for efficient deployments
  • Implemented registration and login functionality using Nuxt and Azure
  • Stored page views via Azure Functions
  • Provided CSV exports for product manager analysis of A/B test results
Jun 2023 - Dec 2024
1 year 7 months
Mainz, Germany

AI Developer

Ryze Digital

  • Intelligent Chatbot Integration using React and Botpress API

  • Developed and deployed a context-aware AI solution using Botpress as a knowledge base engine

  • Created customized React components for seamless chatbot integration into the company website

  • Optimized chatbot response processing and state management with React hooks and Context API

  • Enterprise ChatGPT with LanceDB vector database integration

  • Customized an open-source LLM platform with React to build an enterprise-ready private knowledge management system

  • Developed custom connectors for Microsoft SharePoint and Confluence to extract, process and transform documentation into vector embeddings

  • Implemented LanceDB for efficient semantic search

  • AWS automation microservice for a publishing client

  • Designed and implemented a Node.js microservice using AWS SDK, Transfer Family, S3, EventBridge, DynamoDB and Lambda

  • Dockerized the microservice and parameterized AWS infrastructure with Terraform as Infrastructure as Code

Mar 2023 - Dec 2024
1 year 10 months

Vue Developer

Servinga GmbH

  • Techstack: Vue 3, Javascript, Vuex, Tailwind CSS
  • Redesigned the front end and migrated from Vue 2 to Vue 3
  • Developed a platform for customers to buy and manage virtual private servers easily and cost-effectively
Nov 2021 - Aug 2022
10 months

Vue / Shopware Developer

Realum.cloud GmbH

  • Techstack: Nuxt.js, Vue 3, Shopware 6, Shopware API
  • Increased sales for a chain of butcher shops by developing an immersive 3D shopping experience allowing customers to select meat products from a realistic shop counter perspective
  • Integrated Shopware 6 to manage product catalogues and direct customer interaction via a 3D product view
  • Customized and optimized Nuxt.js and Vue.js for a smooth user experience
  • Implemented Shopware 6 API to query and manipulate data and ensure robust, scalable product integration
May 2020 - Jul 2020
3 months

Fullstack Developer

Posterlab GmbH

  • Techstack: Vue, Node.js (Javascript/Typescript), CI/CD with GitLab Pipelines
  • Developed an MVP for a scientific poster canvas using Nuxt 3 and various AWS services
Oct 2018 - Feb 2022
3 years 5 months
Frankfurt, Germany

Fullstack Developer

Commerzbank AG

  • Techstack: Kotlin, Spring Boot WebMVC, JPA, Spring Boot Security, Angular 12 (Javascript/Typescript)
  • Focused on fullstack development with Kotlin and Angular 10
  • Developed backend APIs with Kotlin and Spring Boot
  • Hosted Docker containers in a Kubernetes cluster on Google Cloud Platform
  • Developed a modern, self-managed identity solution based on the Hyperledger Aries framework funded by the German Federal Ministry of Economics and Innovation
Feb 2018 - Jun 2018
5 months
Frankfurt, Germany

Backend Developer

Solactive AG

  • Techstack: Python, Apache Airflow, Automations, NoSQL
  • Automated finance team workflows using Python and Apache Airflow to reduce time spent on tedious tasks
  • Digitized a manual Excel process into an automated pipeline with data analysis using Pandas and Cassandra
  • Developed and maintained internal libraries and FTP servers

Fullstack Developer

Check24

  • Techstack: React, MobX, Vitest, Cypress, Bitbucket CI
  • Developed responsive user interfaces with React 18 and MobX
  • Tested tickets on up to eight screen sizes, including cell phones, tablets and desktops
  • Wrote unit tests and smoke tests using Vitest and Cypress

Summary

As a fullstack developer with 6.5 years of professional experience, I develop AI applications with a focus on LLMs and semantic search with vector databases (RAG). MCP Server Kotlin & Spring Boot [link] RAG & Embeddings [link] React [link] Vue [link] GraphQL [link]

Skills

  • Llm Tooling: Langchain, Llamaindex, Open Router, Openai Tool Calling
  • Llm Evaluation: Ragas, Langfuse
  • Unit & E2e Testing: Vitesse, Playwright, Jest
  • Vector Databases: Chromadb, Lancedb, Qdrant, Indexing & Retrieval (Faiss / Hybrid Search)
  • Ci/cd With Azure And Gitlab: Build/release Pipelines, Container Deployments, Secrets Management
  • Vue.js With Typescript: Vue 2, Vue 3, Vuex, Pinia, Vite Bundler
  • Embeddings: Bge-icl, Text-embedding-3-large
  • Docker: Docker Compose, Containerization
  • React With Typescript: React 19, Next.js 15, Css-in-js

Languages

German
Native
English
Advanced

Education

Oct 2018 - Jun 2022

University Mainz

Bachelor · Computer Science · Mainz, Germany · 1.8

Certifications & licenses

HashiCorp Certified: Terraform Associate (003)

HashiCorp

Graph Developer Associate

Apollo

Corda Certified Developer

R3

AWS Cloud Practitioner

AWS

Microsoft Azure AI-900

Microsoft

Vue.js Certified Developer

Vue Academy

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