Hire the Best System Programmers
in Germany

More than 3,000 reviews on G2
Rating is 4.5 out of 5.
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of Upwork by G2 peer reviewers
David W.

Krailling, Germany

$33/hr
5.0
9 jobs

Experienced IT consultant, former CISO, tech writer, web developer, modern tinkerer. • 6 years experience as a pentester and IT security professional, documenting and mitigating and vulnerabilities, IEC/ISO 27001 compliance and ISMS implementations. • 9 years web developer and programmer. High proficiency in all major scripting languages, including Python, PHP, Perl, Bash, ZSH, Javascript and Frameworks. • 11 years experience as systems administrator on high-availability web servers, database servers. Hands-on experience on practically all flavors of enterprise-level Linux systems. • 20 years IT media specialist, author for IT magazines and major IT publishers, online and print, CVE advisories and mitigation How-To-Articles in English and German.

  • System Administration
  • Network Security
  • Web Content Development
  • Python
  • Bash
  • Debian
  • Ubuntu
  • Red Hat
  • Technical Manual
  • German
  • Content Creation
  • Documentation
  • Penetration Testing
  • PHP
  • Django
Maksym S.

Karlsruhe, Germany

$25/hr
5.0
10 jobs

About me: Experienced in electronics and software developing. Skilled in circuit design, PCB development, FPGA. Proficient in multiple programming languages like Assembler, C, C++, C#, Java, js, Verilog, Bash. Plus, last 4 years an experience of working with AUTOSAR project. Many years of experience to develop and support cross-platform desktop SW under Windows/Linux/MacOS with using Java Spring, Groovy, MSVC, .NET (C#), Qt and bash scripting. Experience in DevOps and logging area: Amazon AWS, Ansible, Packer, Terraform, Concourse, ELK stack and oth. Team Lead experience - capable of managing and guiding developer teams. Worked in teams on projects of varying complexity in companies like Comcast (US) and Harman, Continental (Germany). Friendly, responsible, and punctual, with a collaborative mindset.

  • Desktop Application
  • Personal Computer
  • Web Application
  • Web Development
  • C++
  • Microsoft Visual C++
  • Bash
  • Java
  • C#
  • JavaScript
  • Apache Groovy
  • Assembler
  • Python
  • Verilog
Maryam N.

Hamburg, Germany

$30/hr
5.0
1 jobs

High-Performance Technical UI Developer & Unity Specialist I bridge the gap between artistic vision and technical implementation. With 5+ years of experience in the game industry, I specialize in creating optimized, responsive, and player-centric UI systems using Unity and C#. What I bring to your project: Technical UI Mastery: Expert in uGUI, Canvas optimization (reducing Rebuilds/Draw Calls), and responsive layouts for Mobile (iOS/Android) and WebGL. Engineering Excellence: Advanced C# logic for UI systems, including modular architectures, Event-driven menus, and seamless IPointer interactions. Design-to-Code Pipeline: Proficient in Figma and Adobe Creative Suite, ensuring pixel-perfect translation from design to functional, ready-to-use Unity prefabs. Proven Track Record: Author of professional tools on the Unity Asset Store and contributor to 5+ successfully launched mobile titles. My Goal: To deliver UI that isn't just a pretty picture, but a high-performance, scalable system that enhances your game's UX without draining the device's battery. Let’s build something visually stunning and technically superior together!

  • Game Design
  • Android App Development
  • Mobile Game
  • Figma
  • Blender
  • Unity
  • Technical Design
  • GUI Design
  • UIKit
  • Menu Design
Sukanta B.

Berlin, Germany

$25/hr
4.8
72 jobs

I’m Sukanta — a Full Stack Developer with a B.Sc. in Computer Science and 7+ years of experience building secure, scalable, and high-performing web applications. I deliver complete solutions — from frontend UI/UX to backend architecture and API integrations — with a focus on performance, maintainability, and client satisfaction. I have successfully developed SaaS platforms, enterprise systems, single-page applications (SPAs), and RESTful APIs for clients worldwide. Core Skills * Frontend: React.js (Redux, Zustand, React Router, Next.js), Vue.js (Vuex, Pinia, Vue Router, Nuxt.js), TypeScript, JavaScript (ES6+), GrapesJS, jQuery, Bootstrap, Tailwind CSS, SCSS * Backend: Node.js (Express.js, Nest.js), Python (Flask, FastAPI), PHP (Laravel, CodeIgniter) * Databases: MySQL, PostgreSQL, MongoDB, SQL, NoSQL * DevOps & Deployment: Docker, Nginx, AWS, DigitalOcean, Heroku, cPanel, CI/CD (Ploi.io, DeployHQ) * Version Control: Git, GitHub, GitLab, Bitbucket * Testing: Unit Testing Special Expertise * API Integration: Google Drive, Dropbox, OneDrive, Google Maps, Facebook Graph, LinkedIn, Twitter, Hogan Assessments, Airlines APIs, Payment APIs (Stripe, PayPal, SSLCOMMERZ), and more * Generative AI & LLM: ChatGPT API, AI Automation, RAG, Vector Databases * Architecture & Scalability: Microservices, REST APIs, real-time apps with Redis & Socket.io 💡 Why Clients Choose Me 👉 Fast, clear, and proactive communication 👉 On-time delivery and commitment to deadlines 👉 Experience with large-scale web projects 👉 Strong problem-solving mindset and adaptability 👉 Willingness to learn and implement new technologies quickly 💗 Let’s turn your idea into a robust, scalable web application. 💗 Send me a message, and I’ll be happy to discuss your project.

  • MySQL
  • Vue.js
  • Docker
  • Node.js
  • Laravel
  • MongoDB
  • React
  • API Integration
  • Nuxt.js
  • Python
  • FastAPI
  • NestJS
  • TypeScript
  • Next.js
  • ChatGPT
  • ExpressJS
  • PHP
  • JavaScript
  • HTML5
  • Bootstrap
  • SCSS
Pavel O.

Berlin, Germany

$39/hr
4.8
128 jobs

💼 Python Developer | Python Django | Python Web Scraping | Python Full Stack Developer | Python AI | Python Automation 🏆 TOP RATED PLUS | 💰 $5M+ Client Revenue | 💼 111+ Projects Delivered | ✅ 11,000+ Upwork Hours 💡 Clients Achieved: 🚀 Raised $4.9M+ / $9.4M+ / $6M+ after product development 📈 Scaled platforms to millions of users & billions of operations ⚡ Reduced system load & response time with optimized Python architectures 💰 Automated payments, workflows, and analytics → higher ROI & efficiency 🏥 Built secure, compliant systems (HIPAA, GDPR) used by global organizations I am a Python Developer, Python Full Stack Developer, Python AI Developer, and Python AI Engineer with 10+ years of experience building scalable web platforms, SaaS products, AI systems, and high-performance backend architectures. As a Python Developer, I specialize in designing clean architecture, scalable systems, performance optimization, and production-ready solutions that support real business growth. I work as a Python Full Stack Developer (Python + React / Next.js), combining powerful backend engineering with modern frontend development to deliver complete end-to-end applications. My expertise includes Python Django development, Flask development, and FastAPI development, building robust APIs, microservices, and distributed systems. I am also a Python Automation Engineer and Python Web Scraping Specialist, building intelligent automation systems, data extraction pipelines, and large-scale Python web scraping solutions for business intelligence, analytics, and AI-driven data processing. I design reliable scraping architectures that handle complex, high-volume data at scale. As a Python AI Developer, I build AI-powered applications, NLP systems, automation workflows, and data-driven intelligent platforms integrated with modern Python frameworks and cloud infrastructure. ⚡ Core Expertise as a Python Developer Python Full Stack Development (Python + React / Next.js) Python Django Developer, Flask Developer, FastAPI Developer Python AI Development & Machine Learning Integration Python Automation Engineering for business workflows Python Web Scraping & Data Extraction Systems Scalable backend systems, APIs, and microservices Cloud & DevOps (AWS, Docker, CI/CD pipelines) High-performance, production-grade Python systems 🚀 Selected Projects The Skills ($4.9M raised) 🎓 – Built and scaled an e-learning platform with payments, subscriptions, and mobile apps. As a Python Developer, helped launch a product used by thousands of users worldwide. Veeqo (acquired by Amazon) 📦 – Developed retail infrastructure processing £1B+ in orders. Optimized backend performance, integrated Stripe, and reduced server load using AWS Lambda as a Python Developer. Creyos (75K+ users, healthcare) 🏥 – Built a HIPAA-compliant cognitive assessment platform used by global research institutions. As a Python Developer, worked on secure data systems, scaling, and performance. CityFALCON ($6M raised) 📊 – Created a real-time NLP-powered financial news platform processing millions of articles daily. Designed scalable backend architecture as a Python Developer. ⚡ What I Deliver as a Python Developer Clean, scalable Python AI systems and backend architectures High-performance Python Django / Flask / FastAPI applications Python Full Stack Development (React / Next.js integration) Python Automation & Python Web Scraping solutions AI-powered Python applications and intelligent workflows Secure, compliant systems (GDPR, HIPAA-ready architectures) End-to-end product delivery from idea to production Client Testimonials ⭐⭐⭐⭐⭐ “Very professional! Pleasure to work with. Will definitely use again.” ⭐⭐⭐⭐⭐ “Super reliable, fast, and with clean, well-structured code. Communication was smooth and always on time.” ⭐⭐⭐⭐⭐ “Very satisfied with the work.” 💼 Why Clients Work With Me 10+ years of proven experience as a Python Developer Strong expertise in Python Full Stack, Python AI, and Python Web Scraping Ability to scale systems from MVP to enterprise-level platforms Deep understanding of backend architecture and system design Reliable communication and predictable delivery 🚀 Let’s talk about your project - I am available as your Python Developer, Python Full Stack Developer AI React, Python AI Developer, Python Automation Engineer, Python Django Developer, and Python Web Scraping Specialist.

  • Python
  • Python Script
  • Data Scraping
  • Automation
  • Artificial Intelligence
  • Machine Learning
  • Deep Learning
  • Scripting
  • Data Extraction
  • Chatbot Development
  • FastAPI
  • Back-End Development
  • Django
  • PostgreSQL
  • JavaScript
  • Flask
  • API
  • React
  • jQuery
  • Docker
Kunjan V.

Karlsruhe, Germany

$126/hr
5.0
65 jobs

🚀Hi! I help startups go from demo → market-ready AI product - fast! I plug into your team and ship production ready features that customers love. 🏆 Top 1% (Expert-vetted) | 8+ years| 100% JSS | 35+ Delighted Clients | 18+ E2E Deployments 🎯 "𝘒𝘶𝘯𝘫𝘢𝘯 𝘪𝘴 𝘢𝘯 𝘢𝘣𝘴𝘰𝘭𝘶𝘵𝘦 𝘨𝘦𝘮! 𝘚𝘩𝘦 𝘸𝘦𝘯𝘵 𝘢𝘣𝘰𝘷𝘦 𝘢𝘯𝘥 𝘣𝘦𝘺𝘰𝘯𝘥. 𝘛𝘦𝘢𝘮𝘪𝘯𝘨 𝘶𝘱 𝘸𝘪𝘵𝘩 𝘩𝘦𝘳, 𝘸𝘦 𝘣𝘶𝘪𝘭𝘵 𝘳𝘰𝘣𝘶𝘴𝘵 𝘥𝘢𝘵𝘢 𝘱𝘪𝘱𝘦𝘭𝘪𝘯𝘦𝘴, 𝘰𝘱𝘵𝘪𝘮𝘪𝘻𝘦𝘥 𝘓𝘓𝘔𝘖𝘱𝘴, 𝘵𝘳𝘢𝘯𝘴𝘪𝘵𝘪𝘰𝘯𝘦𝘥 𝘧𝘳𝘰𝘮 𝘧𝘢𝘯𝘤𝘺 𝘥𝘦𝘮𝘰𝘴 𝘵𝘰 𝘢 𝘴𝘤𝘢𝘭𝘢𝘣𝘭𝘦 𝘈𝘐 𝘱𝘳𝘰𝘥𝘶𝘤𝘵 𝘵𝘩𝘢𝘵 1000𝘴 𝘰𝘧 𝘤𝘶𝘴𝘵𝘰𝘮𝘦𝘳𝘴 𝘭𝘰𝘷𝘦!" - CTO, Healthcare startup, SF (1 of many 5-star reviews) Over 7+ years on Upwork, I've helped startups and enterprises across sectors - Marketing, Healthcare, Law, Education, and Agribusiness - translate AI into measurable business ROI by building the right data and ML foundations. Whether collaborating with 1000+ employee companies or lean 2-person startups, I adapt to the team’s needs: reporting directly to CEOs or CTOs as an AI/Data Lead, or integrating as a hands-on contributor alongside in-house developers. I bring a “brain-for-hire” + hands-on mindset - tackling strategic and technical challenges with equal enthusiasm, always focused on delivering outcomes, not overhead. 👀 See 8+ Case Studies & Demos: totemxlabs dot com/#casestudies 🎯 Recent Success Stories (2024-2025) 1. Graph RAG for Marketing & Strategic decisions Implemented knowledge graph-powered RAG systems using Neo4j for marketing intelligence and SEO optimization - enabling sophisticated knowledge checks and relationship-based insights that traditional RAG cannot achieve. 2. Workplace Safety Vision System Deployed end-to-end computer vision solution for workplace health and safety compliance - real-time hazard detection, PPE verification, and automated incident reporting. 3. Healthcare Diagnostic Knowledge Graph Developed evidence-based diagnostic system using knowledge graphs for healthcare - producing auditable, traceable diagnostic reasoning paths that meet clinical documentation standards. 🧭 My Proven AI Product Process: Discovery: Identify high-ROI AI opportunities aligned with your goals. Data Assessment: Evaluate data availability, relevance, quality. Solution Design: Define user journeys, tech stacks, evaluation frameworks. Development: Optimized sprints for cost-effective, robust AI solutions (min. tech debt). Deployment: Scalable architectures, rigorous testing for production readiness. 💡 Technical Expertise: GenAI & LLMs: LLM Ops (Fine-tuning, Prompt Engineering, RAG, Agentic Workflow, Multi-agent systems, Memory Management), LangChain, LangGraph, LlamaIndex, LangServe; Vector Search (Pinecone, Weaviate, Chroma, FAISS). AI/ML & MLOps: Predictive Analytics, Recommender Systems, RLHF; Model Lifecycle, MLflow, Feature Stores; PyTorch, TensorFlow, Scikit-learn. Cloud & Infra (Multi-cloud): AWS (Lambda, ECS, ElastiCache, DynamoDB, API Gateway), Azure, GCP, Vertex AI, SageMaker; Docker, Kubernetes (EKS/GKE). Software & Data Eng: Python (expert), Fullstack; FastAPI, Flask, Django; REST, GraphQL, OpenAPI, AsyncIO; Batch/Stream (Airflow, Spark, Kafka), Pandas, Polars, dbt; ETL/ELT. DBs/Arch/DevOps: PostgreSQL, MySQL, DynamoDB, MongoDB, Vector DBs (Pinecone, Weaviate, ChromaDB), Neo4j; Microservices, GitHub Actions, Terraform, CI/CD pipelines. 🤝 Why Partner With Me? I help architect and develop E2E AI solutions merging tech excellence with business acumen. Let's transform the AI wave into your competitive edge. ✅DM me if you have an exciting problem to solve! —Updated January, 2026— Latest LLMs (2025-26): GPT-5.2 (OpenAI's flagship with 26% lower hallucination rate) Claude 4.5 Opus & Sonnet 4.5 (200K context, breakthrough coding performance) Gemini 3 Pro & Flash (Deep Think mode, multimodal excellence, 1M token context) DeepSeek V3.2 & R1 series (685B parameters, hybrid thinking/non-thinking modes) Qwen 3 series (open weight dense and mixture-of-experts (MoE) model for reasoning tasks) Agentic AI Frameworks: Langchain & LangGraph (stateful graph-based workflows, production-grade orchestration) OpenAI Agents SDK (lightweight with guardrails and handoffs) CrewAI (role-based multi-agent collaboration, human-in-the-loop) LlamaIndex Agents (RAG-first agent capabilities) AI workflow automation: n8n Knowledge Graphs & Graph RAG: Neo4j 2025 features: Community summaries, parallel retrievers, LLM Knowledge Graph Builder Neo4j Aura Graph Analytics Graph RAG architecture Cypher query optimization, graph embeddings for ML Agentic knowledge graph construction with provenance Computer Vision Applications: Workplace safety, Video generation Multimodal Vision Language Models (VLMs) Context engineering for high quality content generation

  • Machine Learning
  • Deep Learning
  • Artificial Intelligence
  • Python
  • Natural Language Processing
  • Data Science
  • Computer Vision
  • PyTorch
  • TensorFlow
  • Retrieval Augmented Generation
  • Large Language Model
  • Data Engineering
  • AI Agent Development

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