Lutz E.-Software Engineer Full-Stack (React/Next.js, TypeScript, C#/.NET, Python, Node.js)
Check rate
Experience
Freelance Software Developer – GoPro MultiCam Control via COHN
Plutos Company UG
- Developed a pilot system to control and monitor multiple GoPro cameras
- Implemented start, stop, status, media, download and diagnostic functions via COHN endpoints
- Built camera detection, individual and group control, and stable session/KeepAlive logic
- Set up a download pipeline with a queue, retry handling and temporary files
- Ensured consistent session, folder and file naming for multicamera recordings
- Integrated provisioning, certificates and network operations
Freelance Software Engineer – OCR Web Service for Receipt Analysis, Phase 2
i&k software GmbH
- Extended the OCR web service with automatic receipt classification for train, flight, hotel, rental car, taxi, public transport and parking receipts
- Expanded the parser logic to extract amounts, dates, fees, tax/country details and receipt-type-specific features in a structured format
- Improved OCR reliability with rotation detection, text layer fallback, enhancement comparison and marker-based analysis
- Standardized API requests, validation, error handling and configuration
- Expanded documentation, the demo frontend and reference cases
Freelance Software Engineer – Computer Vision Pipeline & Demo Frontend
ReaWorks
- Developed a pipeline for uploading and analyzing clothing photos
- Extracted and normalized attributes such as category, colors, patterns and materials
- Implemented a heuristic post-processing layer for robust JSON output
- Created a responsive demo frontend with a results overlay and photo gallery
Freelance Software Developer
i&k software GmbH
- Built the technical foundation for an OCR web service for structured receipt analysis
- Implemented multi-tenant, read-only file access and local IIS configuration
- Developed an OCR pipeline with preprocessing, PDF text layer bypass, timeout and retry logic
- Implemented an initial train receipt parser with structured JSON output
- Developed an ASP.NET Core demo/proxy layer with CORS protection and health functions
- Built a React demo frontend for file management, OCR text display and JSON visualization
Freelance Software Engineer
Proventus Treuhand und Verwaltung AG
- Developed a high-performance 64-bit C++ DLL for fast state and data storage in MultiCharts
- Implemented a vector-based 3D float DataStore with persist/restore functionality
- Created a PL interop layer with error codes and guard logic
- Enabled bidirectional data exchange between charts in backtesting and live trading
- Developed a licensing model with runtime license checks and feature control
Monte Carlo Risk Analytics
Signalworks
- Implemented interactive Monte Carlo simulations based on historical trade results
- Developed several simulation models with parameter controls and reproducible runs
- Displayed the final distribution, including a histogram and key metrics
- Optimized performance using Web Workers for concurrency
- Multilingual (8 languages) and responsive application
Strategy Analytics Dashboard
Signalworks
- Developed a strategy analytics dashboard with about 25 interactive charts
- Implemented lazy loading and rendering optimizations for large views
- Added dark/light mode support and consistent theme management
- Ensured stable performance with over 10.000 data points and zoom/scroll features
- Built a modular component structure with reusable chart containers
- Fully responsive and multilingual interface
Telegram Signal & Alert Bots
Signalworks
- Developed several crypto bots with threshold alerts for prices, indicators, and events
- Created chart snippets and automated daily reports
- Built a rule engine using a queue/worker approach with PostgreSQL persistence
- Integrated via REST/WebSocket with retry and reconnect handling
- Secured connections using a proxy/tunnel, HTTPS, rate limits, and WAF rules
- 24/7 operation with logging, monitoring, and automatic restarts
Freelance Software Developer
WH SelfInvest SA
- Developed C++ plugins and visual trading tools for the NanoTrader API
- Created modular entry/exit toolkits with OCO/order logic and risk rules
- Integrated real-time systems with a focus on low latency and stable performance
- Implemented safe reconnects, error handling, and logging
Senior Development Engineer
BosTrade GmbH
- Developed low-latency trading components and live integrations
- C# orchestration and a C++ bridge for high-performance core logic
- Implemented risk controls, safeguards, and reconnect strategies
- Integrated platforms and feeds such as Rithmic and CQG with monitoring
Freelance Software Developer
ituma GmbH
- Development of multi-tenant backends with authentication, vouchers/tokens, and roles/permissions
- Reporting, exports, and admin features for operational processes
- Implementation of GDPR-compliant data protection and consent flows
- Project assignments at Mazda and Ford, including deployment and handover
Full-Stack Software Developer
Freelance Software Developer
- Development of AI workflows using context engineering, agentic RAG, tool calling, MCP tools, local AI runners, and structured result processing
- Spec-Driven Development with Codex, Claude Code, and ChatGPT for defining requirements, developing code, refactoring, testing, and iterative quality checks.
- Development of modern web applications with React, Next.js, TypeScript, Tailwind CSS, and data-driven UI components
- Building backend services and APIs with .NET/C#, ASP.NET Core, Node.js, and Python
- Development of OCR, e-invoicing, and computer vision applications with document analysis, KoSIT validation, PDF generation, parsers, and JSON output.
- Trading, analysis, and real-time software for backtesting, risk analysis, signal systems, and platform integration
- Data pipelines, import/export workflows, reporting, and persistence with SQL Server, PostgreSQL, and SQLite
- Desktop, control, and interoperability solutions with C#/.NET, C++, DLLs, P/Invoke, and Python/Qt
- Automation, bots, schedulers, queues, worker processes, and technical tools
- Operation and integration on Windows Server, IIS, Docker, reverse proxies, Git, CI/CD, logging, and health checks
- Performance optimization, stabilization, modernization, and migration of existing applications
- Requirements analysis, prototyping, demos, technical documentation, and further development of existing and new systems
Audio and Video Repair Technician
Radio Labenski
Audio and Video Repair Technician
RFT GmbH
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Banking and Finance, Professional Services, Automotive, and Manufacturing.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Operations, and Business Intelligence.
Summary
Senior Full-Stack & AI Engineer with over 20 years of experience in software development. I develop business applications, APIs and web interfaces with C#/.NET, Python, React and TypeScript. I build databases, integrate external systems, process data and further develop existing applications.
For AI projects, I integrate language models and agents into software development. I work with Context Engineering, Agentic RAG, MCP and local coding agents such as Codex and Claude Code. I use code, documents and project data for analysis and development tasks.
I clarify requirements directly with business teams, share progress updates and support projects from planning through to launch. I have many years of experience in performance optimization, troubleshooting and modernizing existing software.
Skills
Ai Engineering & Document Processing
- Agentic Ai
- Spec-Driven Development
- Large Language Models
- Agentic Rag
- Context Engineering
- Tool Calling
- Mcp Toolserver / Model Context Protocol
- Openai/Codex
- Claude/Claude Code
- Ocr
- Data Extraction
- Parser/Validation
- Structured Llm Workflows
Frontend & Ux
- React
- Next.Js
- Typescript
- Tailwind Css
- Responsive Uis
- Dashboards
- I18n
- A11y
Backend & Apis
- .Net / C#
- Asp.Net Core
- Asp.Net Web Api
- Node.Js
- Python
- Rest/Json
- Dtos
- Openapi/Swagger
Data & Persistence
- Sql Server
- Postgresql
- Sqlite
- Duckdb
- T-Sql
- Entity Framework
- Csv/Xlsx Pipelines
- Reporting
Trading & Realtime
- Powerlanguage
- Easylanguage
- Ninjascript
- Nanotrader
- Multicharts
- Ibkr Tws
- Risk/Order Module
Operations & Integration
- Iis
- Windows Server
- Docker
- Github Actions/Gitlab Ci
- Cloudflare
- Logs
- Health Checks
- Monitoring
Performance & Interop
- Web Workers
- Lazy Loading
- C++/C# Dlls
- P/Invoke
- Robust Processing Of Large File/Data Workflows
Languages
Education
Technische Universität, Ilmenau
Diplom-Ingenieur (Dipl.-Ing.) · Electrical Engineering / Media Technology · Ilmenau, Germany
Volkshochschule Nauen
General university entrance qualification · Evening high school program · Nauen, Germany
PGH Rundfunk und Fernsehen, Falkensee
Training as a Radio and Television Technician · Radio and Television Technology · Falkensee, Germany
Certifications & licenses
Microsoft Certified Professional Developer (MCPD)
GFN AG, Köln
GFN AG, Köln
Weiterbildung Medienmanagement
mibeg-Institut, Köln
Statistics
Experience
Global experience
Expertise
Qualifications
Frequently asked questions
Have questions? Find more information here.
Lutz is based in Solingen, Germany and can operate in on-site, hybrid, and remote work models.
Lutz speaks the following languages: German (Native), English (Advanced), Russian (Advanced).
Lutz has at least 26 years of experience. During this time, Lutz has worked in at least 11 different roles and for 11 different companies. The average length of individual experience is 2 years and 10 months. Note that Lutz may not have shared all experience and actually has more experience.
Based on recent experience, Lutz would be well-suited for roles such as: Freelance Software Developer – GoPro MultiCam Control via COHN, Freelance Software Engineer – OCR Web Service for Receipt Analysis, Phase 2, Freelance Software Engineer – Computer Vision Pipeline & Demo Frontend.
Lutz's most recent position is Freelance Software Developer – GoPro MultiCam Control via COHN at Plutos Company UG.
In recent years, Lutz has worked for Plutos Company UG, i&k software GmbH, ReaWorks, Proventus Treuhand und Verwaltung AG, and Signalworks.
Lutz is most experienced in industries like Information Technology, Banking and Finance, and Professional Services. Lutz also has some experience in Automotive, Manufacturing, and Fashion.
Lutz is most experienced in business areas like Information Technology, Product Development, and Operations. Lutz also has some experience in Business Intelligence.
Lutz has recently worked in industries like Information Technology, Banking and Finance, and Fashion.
Lutz has recently worked in business areas like Information Technology, Product Development, and Business Intelligence.
Lutz holds a Master in Electrical Engineering / Media Technology from Technische Universität, Ilmenau.
Lutz has 3 certificates. These include: Microsoft Certified Professional Developer (MCPD), Microsoft Certified Professional (MCP), and Weiterbildung Medienmanagement.
Lutz is immediately available full-time for suitable projects.
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Calculated based on our freelancers’ daily rates as of 3 Nov 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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