
ONNX Experts in Germany
for production-ready machine learning, matched in minutes with vetted professionalsHire experts who optimize ONNX models, integrate ONNX Runtime and connect machine learning workflows across PyTorch, TensorFlow and cloud or edge environments. FRATCH helps you find precise matches with vetted, available freelancers quickly.
Meet FRATCH Experts in Germany, who have recently used ONNX
Niklas W.
Last position:
AI Engineer at Tensora GmbH
- Designed and developed a multi-tenant SaaS platform enabling organizations to build their own knowledge bases and chat with brand-customized AI assistants (white-label approach with dynamic branding per organization).
- Implemented a scalable RAG architecture with a GPT-4o tool-use loop, hybrid semantic search, and strict tenant isolation at database and search index level.
- Built persistent, project-like chat sessions including a streaming API (SSE), multilingual support, and speech input/output (STT/TTS).
- Delivered the cloud infrastructure as Infrastructure-as-Code, fully automated per-customer CI/CD pipelines, and an onboarding process for new tenants.
Technologies used: Python, FastAPI, Pydantic (v2 noted), Next.js, React, TypeScript, Tailwind CSS, OpenAI / LLMs (GPT-4o), Azure AI Search, Cosmos DB, Azure Blob Storage, Azure Cognitive Services Speech, Azure App Service, Azure Container Registry, Retrieval-Augmented Generation (RAG), Server-Sent Events (SSE), Docker, Terraform, GitHub Actions, REST, OpenID Connect (OIDC), Multi-Tenancy
Danny-Michael B.
Last position:
Senior AI Engineer at Just Add AI GmbH
- Automatic detection of content on various documents
- Recommendation Engine
- Dynamic Pricing
Benjamin M.
Last position:
Founder, system architect, and main developer at Institute for Artificial Study (IAS)
- Expert-supervised AI systems for scientific reasoning, model evaluation, and research workflows.
- Built the IAS Problem Solver, an orchestrated system for difficult mathematical reasoning; it achieved 84% in one submitted answer set on the Leipzig mathematics benchmark.
- Built a resumable state-machine pipeline for research-grade mathematics benchmark generation: source selection, LLM-agent-based phenomenon discovery, task synthesis, gold-answer and certificate generation and validation, probing, repair, human feedback, and quality gates, targeting tasks that are difficult, natural, verifiable, and cost-effective.
- Current work extends this into budget-aware AI research workflows for real scientific problems with expert review.
Tech stack: Python, OpenAI/OpenRouter-compatible APIs, embeddings, RAG, SQLite.
Cris L.
Last position:
Head of AI at Harvest Hub
- Leading AI development for aquaculture startup, optimising shellfish visual assessments with machine learning and computer vision.
- Development and systematic evaluation of ML/CV algorithms for shellfish condition and morphometrics, using Python, Pytorch and MLFlow.
- Analysis of model performance, including identification of failure modes and edge cases in production deployments.
- Design of annotation strategies and refinement of labelled datasets for computer vision tasks.
- Detailed analysis of system performance and communication of findings through publication-quality technical reports to investors and fellow R&D staff.
- Responsible for delivery of technical roadmap.
Hamza S.
Last position:
Research Associate - AI & Autonomous Systems at Hochschule Coburg
- Developed and implemented AI-based perception and multimodal systems for real-world environments
- Built, trained, and evaluated Machine Learning and Deep Learning models using Python, PyTorch, TensorFlow, and OpenCV
- Worked with Vision-Language Models (VLMs), Large Language Models (LLMs), transformer-based architectures, and multimodal AI systems
- Applied LoRA-based fine-tuning techniques and experimented with diffusion models for generative and multimodal AI applications
- Developed multimodal perception pipelines using camera, LiDAR, and sensor data
- Designed end-to-end workflows for data processing, model training, evaluation, benchmarking, and robustness analysis
- Utilized HuggingFace Transformers and modern Deep Learning frameworks for AI experimentation and deployment workflows
- Applied GPU-accelerated computing, CUDA-based processing, ONNX, and TensorRT optimization for efficient inference and large-scale model training
- Collaborated with industry partners including Valeo and REHAU on applied AI and intelligent system projects
- Developed scalable AI architectures and prototype software solutions for automation and perception tasks
Ariel L.
Last position:
Sr. Principal Engineer at Slalom
- Held direct line management responsibility for a team of 4 Platform Engineers — owning hiring, performance reviews, and career development — while establishing a shared engineering standards framework and coaching culture that accelerated delivery across client engagements.
- Led a team of engineers to architect a cloud-native voice AI system for a major inspection client, enabling 2,500 field inspectors to document work fully hands-free via real-time transcription and AI agents — eliminating manual data entry across 440,000 inspections per month and reducing per-user cost from $9 to $1. Stack: AWS (DynamoDB, S3, Transcribe, CloudFront, API Gateway, Bedrock), ElevenLabs, Claude.
- Led a team of engineers to automate multi-region Kubernetes cluster management for a global SaaS leader, reducing provisioning time from 3 weeks to under a day and eliminating 90% of configuration errors. Stack: EKS, Terragrunt, Python, Bash, ArgoCD.
- Accelerator - Cloud-Agnostic AI Platform: Architected and delivered a cloud-agnostic, Kubernetes-native platform as an accelerator, enabling multi-tenant, enterprise-scale management of self-hosted LLMs with concurrent deployment of multiple base models and dynamic LoRA adapter serving. Designed production infrastructure using open-source tooling (ArgoCD, Karpenter, vLLM, SGLang) with automated model lifecycle management, API security (Keycloak + LiteLLM), and cost-optimized GPU provisioning.
Valery K.
Last position:
Sr. Data Scientist & Engineer at Virtual Minds
- Development of high-performance ad distribution via auction
- Holistic (multi-campaign & multi-channel) advertisement placement optimization
- Algorithmic optimization for NP-Hard/NP-e
- Multiple Knapsack Problem with constraints
- Online estimation of parameters in stochastic environments
Tools: Python, R, Kotlin, MILP/SAT/CP Solvers, Pytorch, Pandas, Docker
Amr A.
Last position:
Machine Learning Engineer at German Research Center for Artificial Intelligence (DFKI)
- Developed end-to-end reproducible ML pipelines (PyTorch) with data versioning (DVC), experiment tracking (MLflow), automated testing (PyTest), and CI/CD across all training workflows.
- Scaled Vision Transformer and CNN training across NVIDIA A100 GPU clusters (CUDA, DDP, SLURM); applied hyperparameter optimization (W&B Sweeps) to reduce training overhead and identify optimal configurations.
- Developed a real-time 3D human motion generation system (ViT, VQ-VAE, SMPL-X/PIXIE) for personality-conditioned avatar synthesis; achieved state-of-the-art FID = 6.15 and P-FID = 10.31 on the UDIVA benchmark.
- Validated model expressiveness through structured user studies, achieving 86% accuracy in distinguishing extroverted vs. introverted avatar behaviors.
- Optimized inference pipelines by deploying PyTorch models via TensorRT and ONNX Runtime into native C++ code; benchmarked performance.
Hamza K.
Last position:
Academic Research Contributor in Health Sector (Volunteer)
- Acted as technical consultant to optimize multi-layer ensemble models combining ResNet, CNN-BiGRU-Attention, and XGBoost.
- Guided implementation of a Logistic Regression meta-learner to solve class imbalance problems, achieving 92.86% accuracy and 0.9644 AUC on PTB-XL and Chapman-Shaoxing datasets.
Ghaith A.
Last position:
Lead Perception Engineer at Driving Examiner AI Platform
- Automated driver assessment by programming temporal rule engines to evaluate lane-change execution safety, head-pose mirror checks, indicator usage cycles, and compliance with traffic lights and road signs
- Synchronized real-time traffic sign recognition and multi-state traffic light classification models with time-series CAN-bus telemetry and HD-map spatial priors to grade traffic rule adherence
- Trained and deployed distinct deep learning models optimized for interior cabin monitoring and exterior surrounding-area perception
- Combined perception outputs with camera intrinsics and horizon stability checks to execute 3D ground-plane object distance estimation assuming flat-ground geometry
- Deployed a split-compute edge network across a 10-vehicle fleet via VPN, implementing a zero-allocation host memory pipeline to eliminate frame accumulation latency (6×21 FPS per vehicle)
Kai W.
Last position:
biobedded systems GmbH
- Embedded software development for EMS safety boards in medical technology according to IEC 62304 / ISO 13485
- Technologies: C++, OpenCV, Python, Qt6, JTAG, UART, CMake, IEC 62304, ISO 13485
Shiqing F.
Last position:
Technical Director at EmotionPool GmbH
- Spearheaded the EU market entry strategy for L3/L4 autonomous logistics vehicles, driving the technological localization and deployment of the parent company’s smart robotics portfolio.
- Orchestrated technical alignment between top-tier autonomous driving suppliers across China and Europe, translating complex client requirements into precise engineering specifications compliant with EU standards.
- Cultivated strategic joint R&D initiatives with leading European universities, research institutes, and enterprises, accelerating the transition of cutting-edge robotic concepts into commercial products.
- Directed the end-to-end architecture of intelligent warehousing solutions, guiding cross-functional teams in optimizing hardware integration for autonomous vehicles & robots, and overall system performance.
- Led the R&D of high-fidelity simulation and AI algorithms using NVIDIA Isaac Sim & Lab, establishing robust "Sim-to-Real" pipelines to train and validate dynamic path planning optimization, intelligent obstacle avoidance, and complex navigation stacks prior to physical deployment.
- Maintained hands-on oversight of the core system architecture, focusing on bottom-level performance tuning, AI model inference acceleration with TensorRT/ONNX Runtime, and sensor integration.
Stephan B.
Last position:
Freelance Data Scientist at Baier Data & AI Consulting
Surya A.
Last position:
AI Software Engineer at Fraunhofer FIT
- Developed LLM-based automation utilities including structured reasoning pipelines, LLM-as-a-Judge evaluation tools, and multi-model comparison frameworks.
- Built RAG pipelines for internal research workflows using LangChain, ChromaDB, and FastAPI, enabling semantic retrieval and multi-step reasoning.
- Integrated LLM microservices into existing ML systems using Docker, FastAPI, and GitLab CI/CD with reproducible deployment workflows.
- Designed inference APIs combining vision models and LLM reasoning for multimodal analytics and decision-making.
- Optimized embedding-based retrieval using vector store pruning, improved chunking logic, and dynamic retriever selection.
- Performed prompt engineering and system instruction tuning for consistency, robustness, and reasoning quality.
- Built benchmarking suites to evaluate LLM latency, reasoning quality, retrieval accuracy, and robustness under different prompt templates.
Uddipan B.
Last position:
Research Team Member at Munich Music Labs, TUM
- Focused on exploring the intersection of Music and AI.
Discover over 15,000 top freelancers
Statistics of experts using ONNX
Aggregated from the professional profiles of matched freelancers.
Experience
15 years

Position duration
1.9 years

Positions per freelancer
11

Top business areas
Information Technology, Product Development, Research and Development

Top industries
Information Technology, Automotive, Manufacturing

Certification focus areas
Information Technology, Research and Development, Business Intelligence
Bachelor's degree or higher
94%
Master's degree or higher
81%
Doctorate
19%

Certifications per freelancer
1

Most common languages
German, English, Arabic

Speak two or more languages
100%
Based on our profile pool as of 19 Sep 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Germany are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge within that range.
Average rates of experts in Germany using ONNX
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
ONNX experts industry focus
See which industries our matched freelancers work in most often — every figure is calculated live from the freelancers on FRATCH.
- Information Technology (100%)
- Automotive (56%)
- Manufacturing (50%)
- Education (38%)
- Banking and Finance (38%)
- Aerospace and Defense (31%)
- Biotechnology (31%)
- Healthcare (31%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What ONNX does
ONNX, short for Open Neural Network Exchange, is an open format for representing machine learning models. It separates model training from inference, allowing teams to move models between frameworks and run them on different hardware. Companies use it for computer vision, language processing, forecasting, recommendation systems and other production workloads.
Models and conversion
ONNX experts convert models from ecosystems such as PyTorch, TensorFlow, scikit-learn and XGBoost into a portable representation. They inspect unsupported operators, preserve input and output behavior, and validate accuracy after conversion. Strong work includes clear export pipelines, reproducible artifacts and versioned model metadata.
Runtime ecosystem
The wider ONNX ecosystem includes ONNX Runtime, graph optimization tools, quantization utilities and hardware-specific execution providers. Professionals may connect models to Python or C++ services, containerized APIs, Kubernetes workloads, mobile applications or edge devices. They also work with CUDA, TensorRT, OpenVINO and vendor accelerators when inference speed or device constraints matter.
Typical project work
- Export and validate models from PyTorch or TensorFlow
- Optimize graphs, operators, memory use and inference latency
- Integrate ONNX Runtime into backend, mobile or edge services
- Build repeatable conversion and deployment pipelines
- Monitor prediction quality and runtime behavior in production
When companies need specialists
Freelance expertise is useful when a trained model must move into a different serving stack, hardware target or application environment. It also helps when conversion produces unsupported operators, accuracy drift or slow inference. In Germany, remote collaboration often works well for these tasks, while on-site sessions can help with factory systems, medical devices or embedded deployments. German and English communication may both matter depending on the project team.
What strong professionals bring
Experienced ONNX professionals understand both model behavior and production constraints. They can profile a full inference path instead of optimizing the graph in isolation, explain trade-offs between precision, throughput and portability, and test outputs against a trusted baseline. They document framework versions, execution providers, preprocessing, postprocessing and fallback behavior so another team can operate the result with confidence.
Frequently asked questions
Everything clients usually want to know about ONNX, in one place.
ONNX is mainly used to represent trained machine learning models in a framework-neutral format. It helps teams move models from training tools such as PyTorch or TensorFlow into inference environments that support ONNX Runtime or specialized hardware.
ONNX is a portable model representation, while TensorFlow Lite and TensorRT are more focused on specific deployment ecosystems and optimization paths. ONNX can be a better choice when a company needs broader framework or hardware flexibility, although a specialist should evaluate operator support and measured performance for the target device.
A strong ONNX specialist usually understands at least one training framework, Python, model validation and production inference. Useful adjacent skills include ONNX Runtime, CUDA, TensorRT, OpenVINO, containerization, API integration and monitoring for model quality and latency.
The right level depends on the task rather than a fixed tenure. A straightforward export may need focused conversion knowledge, while a production migration calls for an ONNX professional who can diagnose unsupported operators, compare outputs, optimize execution providers and handle deployment constraints.
Yes, much of an ONNX project can be handled remotely through repositories, model artifacts, test data and containerized environments. On-site collaboration may still be useful for factory equipment, regulated devices or restricted data environments, and teams should agree on German or English as the working language.
Ask the ONNX professional to explain the source framework, conversion risks, validation method and target execution provider. Review whether they measure accuracy against a baseline, profile real workloads, test edge cases and document preprocessing, postprocessing and fallback behavior.
ONNX Runtime is a strong fit when a team wants a common inference interface across different operating systems, hardware targets or application services. A specialist should still verify operator coverage, accelerator support, memory behavior and deployment requirements before committing to the runtime.
A capable ONNX freelancer should provide the converted model, conversion or export scripts, validation tests and deployment guidance. Depending on the scope, deliverables may also include optimized model variants, benchmark results, container configuration, runtime settings and documentation for future updates.
The average hourly rate of freelancers in Germany who have used ONNX in their recent projects is 90 €, which corresponds to a daily rate of about 724 € based on an 8-hour working day.
Of the freelancers in Germany who have used ONNX in their recent projects, 94% hold at least a Bachelor's degree, 81% hold at least a Master's degree, and 19% hold a doctorate.
On average, freelancers in Germany who have used ONNX in their recent projects have 15 years of professional experience, with a single engagement typically lasting around 1.9 years.
The most common languages among freelancers in Germany who have used ONNX in their recent projects are German (100%), English (100%), and Arabic (13%).
The most common industries among freelancers in Germany who have used ONNX in their recent projects are Information Technology (100%), Automotive (56%), and Manufacturing (50%).
The most common business areas among freelancers in Germany who have used ONNX in their recent projects are Information Technology (94%), Product Development (94%), and Research and Development (94%).
Main locations of FRATCH Experts, who have recently used ONNX
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
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