How do I hire ONNX developers?

To hire the right ONNX developer, it’s important to evaluate a candidate’s experience, technical skills, and communication skills. You’ll also want to consider the fit with your particular industry, company, and project. Toptal’s rigorous screening process ensures that every member of our network has excellent experience and skills, and our team will match you with the perfect ONNX developers for your project.

How are Toptal ONNX developers different?

At Toptal, we thoroughly screen our ONNX developers to ensure we only match you with the highest caliber of talent. Of the more than 200,000 people who apply to join the Toptal network each year, fewer than 3% make the cut. In addition to screening for industry-leading expertise, we also assess candidates’ language and interpersonal skills to ensure that you have a smooth working relationship. When you hire ONNX developers with Toptal, you’ll always work with world-class, custom-matched ONNX developers ready to help you achieve your goals.

Can you hire ONNX developers on an hourly basis or for project-based tasks?

You can hire ONNX developers on an hourly, part-time, or full-time basis. Toptal can also manage the project end-to-end based on your specific requirements as part of our Consulting and Services offerings. Whether you hire a ONNX developer for a full- or part-time position, you’ll have the control and flexibility to scale your team up or down as your needs evolve. Our ONNX developers can fully integrate into your existing team for a seamless working experience.

What is the no-risk trial period for Toptal ONNX developers?

We make sure that each engagement between you and your ONNX developer begins with a trial period of up to two weeks. This means that you have time to confirm the engagement will be successful. If you’re completely satisfied with the results, we’ll bill you for the time and continue the engagement for as long as you’d like. If you’re not completely satisfied, you won’t be billed. From there, we can either part ways, or we can provide you with another ONNX developer who may be a better fit and with whom we will begin a second, no-risk trial.

Skip to Navigation
Skip to Content
Skip to Footer

Related Skills:

Hire ONNX Developers

Hire the Top 3% of ONNX Developers

Hire vetted ONNX developers on demand. Leading companies choose ONNX freelancers from Toptal for their most important development projects.

Hire a Top ONNX Developer Now

No-Risk Trial, Pay Only If Satisfied.

Talent Navigator

Find and hire Top ONNX Developers worldwide. Simply click on your preferred time zone on the map.

Trusted by leading brands and startups

Hire ONNX Developers

View Zak

Zak Kohler

ONNX Developer

Verified Expert in Engineering

UTC-05:00

United States

Toptal Member Since May 27, 2021

Zak is a chemical engineer by training but a hacker at heart. With extensive programming experience (starting in third grade), he excels at delivering the right solution that meets goals for functionality, performance, reliability, and maintainability. While serving as a chemical and software engineer at Cooper Tire & Rubber Company since 2015, he has applied his knowledge of C, Compilers, operating systems, and CPUs, and presented talks on CPUs, Renode, and RISC-V.

ONNX Python Flask JSON Visual Basic

View Xan

Xan Merritt

ONNX Developer

Verified Expert in Engineering

UTC-04:00

Canada

Toptal Member Since September 25, 2026

Xan is an independent ML engineer and consultant with 12+ years of experience building out AI across social media, fashion, and event ticketing. Xan specializes in RecSys and NLP/LLMs. While under contract with HyperComply, they delivered over 15% model accuracy and over 55% audit efficiency. Xan is production-focused, pragmatic, and ethically-centered.

ONNX Machine Learning Python NLP Java Scala Artificial Intelligence

View Jesús

Jesús Copado

ONNX Developer

Verified Expert in Engineering

UTC+01:00

Spain

Toptal Member Since February 23, 2024

Jesús is a software engineer with over seven years of experience in deep learning, computer vision, data science, and multiple technologies, including Python. With a bachelor's degree in software engineering and a double master's degree in autonomous systems, he combines academic excellence with diverse industry experience. Fluent in multiple languages and having lived in four countries, Jesús brings a unique global and dynamic perspective to any project presenting complex challenges.

ONNX Artificial Intelligence GitHub Computer Vision Deep Learning PyTorch Python Convolutional Neural Network

View Stefan

Stefan Mićić

ONNX Developer

Verified Expert in Engineering

UTC+01:00

Serbia

Toptal Member Since July 20, 2022

Stefan is an experienced machine learning and machine learning operations (MLOps) engineer with hands-on experience in big data systems. His almost a decade of expertise is supplemented by a master's degree in artificial intelligence. Stefan has worked on problems such as object detection, classification, sentiment analysis, named-entity recognition (NER), and recommendation systems. He is always looking forward to being involved in end-to-end machine learning projects.

ONNX Python Deep Learning Machine Learning Spark AWS Sagemaker Artificial Intelligence SQL Data Engineering Computer Vision NLP PyTorch Amazon S3

View Viktor

Viktor Cikojevic

ONNX Developer

Verified Expert in Engineering

UTC+01:00

Croatia

Toptal Member Since September 3, 2026

Viktor is a senior ML research engineer with over eight years of experience in generative modeling, LLM systems, and production deployment. At Salient Predictions, he co-led the design and training of GEM-2, a 275-million-parameter generative model that cut training cost by 100x and inference cost by 10x. Viktor brings deep expertise in PyTorch, distributed multi-GPU training, and GCP for AI-driven startups.

ONNX PyTorch Python SQL Computer Vision XGboost Artificial Intelligence Deep Learning Machine Learning Cloud Engineering BigQuery GenAI ChatGPT

View Vasileios

Vasileios Athanasiou

ONNX Developer

Verified Expert in Engineering

UTC+02:00

Greece

Toptal Member Since January 30, 2026

Vasileios is an AI and ML engineer with a PhD and a track record of translating complex R&D into production-grade systems. He is an expert in developing algorithms for both vision and sensor data, bridging the gap between state-of-the-art academic research and industrial deployment. Vasileios has also developed scalable AI and ML solutions and is dedicated to leading technical initiatives and translating complex theories into production-grade applications.

ONNX PyTorch C++Python OpenCV Computer Vision Deep Learning Linux Windows Development Visual Studio Development Artificial Intelligence Data Science Scikit-Learn

View Esat

Esat Kalfaoglu

ONNX Developer

Verified Expert in Engineering

UTC+03:00

Turkey

Toptal Member Since September 1, 2022

Esat obtained his master's degree and is currently finalizing his PhD studies on deep learning topics. He has a strong background in object detection, action recognition, panoptic segmentation, and deep reinforcement learning. Esat is greatly interested in transformer-based architectures.

ONNX PyTorch Deep Learning

View Susanna

Susanna Sargsyan

ONNX Developer

Verified Expert in Engineering

UTC+04:00

Armenia

Toptal Member Since September 15, 2026

Susanna is a senior machine learning engineer with nearly 5 years of experience building and deploying scalable AI systems for clients, including Plat.AI and a robotics/autonomous systems company. Her core expertise spans advanced computer vision and generative AI, supported by robust MLOps engineering using Vertex AI, Kubeflow Pipelines, and GCP. Susanna thrives in fast-paced startup environments, where she recently architected a production ML platform supporting multiple prediction services.

ONNX Machine Learning Deep Learning Python Computer Vision PyTorch Scikit-Learn XGboost OpenCV NumPy Data Analysis Data Engineering Database

View Hovnatan

Hovnatan Karapetyan

ONNX Developer

Verified Expert in Engineering

UTC+04:00

Armenia

Toptal Member Since July 4, 2022

Hovnatan is a computer vision engineer with a PhD in applied physics from Stanford. He is passionate about computer vision and image processing. Hovnatan has worked on a comprehensive variety of projects in the field. He is also a well-rounded software engineer, having integrated his solutions both in cloud-based and desktop (Windows, MacOS) environments.

ONNX Visual Studio Development Linux PyTorch OpenCV MATLAB Python Machine Learning Computer Vision Deep Learning C++Artificial Intelligence NumPy

View Hakob

Hakob Kirakosyan

ONNX Developer

Verified Expert in Engineering

UTC+04:00

Armenia

Toptal Member Since December 30, 2019

Hakob is a machine learning expert and scientific programmer with substantial experience delivering analytics and predictive solutions for business and scientific applications. Additionally, he enjoys developing video games based on augmented reality and remote human-computer interaction paradigms. Hakob is fluent in Python and C++ and has worked as a consultant in a variety of projects, helping clients achieve their goals.

ONNX Unity Visual Studio Development Windows Development C AWS Qt Development Algorithms Neural Network C++Object Detection Multithreading Optical Character Recognition

View Arsenii

Arsenii Fomin

ONNX Developer

Verified Expert in Engineering

UTC+07:00

Kazakhstan

Toptal Member Since November 4, 2015

Arsenii is a full-stack engineer and software architect with experience building production systems across AI, fintech data distribution, serverless platforms, desktop apps, and embedded software. He is especially effective in small, senior teams where business context and technical execution stay close, working directly with founders, CTOs, and product owners to clarify ambiguous requirements, shape practical options, and turn decisions into MVPs, maintainable products, and scalable systems.

ONNX AWS AWS Lambda Angular JSON Algorithms Git Full-stack Web Development TypeScript JavaScript Node.js CSS

Discover More ONNX Developers in the Toptal Network

Start Hiring

THE TOPTAL ADVANTAGE

98% of Toptal clients choose to hire our talent after a risk-free trial.

Toptal's screening and matching process ensures exceptional talent are matched to your precise needs.

Start Hiring

Toptal in the press

... allows corporations to quickly assemble teams that have the right skills for specific projects.

Despite accelerating demand for coders, Toptal prides itself on almost Ivy League-level vetting.

Our clients

Creating an app for the game

Leading a digital transformation

Building a cross-platform app to be used worldwide

Drilling into real-time data creates an industry game changer

Testimonials

Tripcents wouldn't exist without Toptal. Toptal Projects enabled us to rapidly develop our foundation with a product manager, lead developer, and senior designer. In just over 60 days we went from concept to Alpha. The speed, knowledge, expertise, and flexibility is second to none. The Toptal team were as part of Tripcents as any in-house team member of Tripcents. They contributed and took ownership of the development just like everyone else. We will continue to use Toptal. As a startup, they are our secret weapon.
Brantley Pace
CEO & Co-Founder

How to Hire ONNX Developers Through Toptal

Talk to One of Our Client Advisors

A Toptal client advisor will work with you to understand your goals, technical needs, and team dynamics.

Work With Hand-selected Talent

Within days, we’ll introduce you to the right ONNX developer for your project. Average time to match is under 24 hours.

The Right Fit, Guaranteed

Work with your new ONNX developer for a trial period (pay only if satisfied), ensuring they’re the right fit before starting the engagement.

EXCEPTIONAL TALENT

How We Source the Top 3% of ONNX Developers

Our name “Toptal” comes from Top Talent—meaning we constantly strive to find and work with the best from around the world. Our rigorous screening process identifies experts in their domains who have passion and drive.

Of the thousands of applications Toptal sees each month, typically fewer than 3% are accepted.

Start Hiring Today

STEP 1

Language and Personality Evaluation

26.4% of applications pass

The first step of the screening process is a comprehensive English language and communication evaluation. We also assess personality traits, seeking only those who are passionate and fully engaged in their work.

STEP 2

In-depth Skill Review

7.4% of applications pass

We test each applicant’s technical knowledge and problem-solving ability through various assessments. Every member of the Toptal network is an expert in their domain, and we typically only advance candidates with exceptional results in this phase.

STEP 3

Live Screening

3.6% of applications pass

Toptal screeners, who are experts in their functional domain, interview each ONNX developer. Our screeners provide specific live exercises, looking for problem-solving ability, depth of experience, communication ability, and creativity.

STEP 4

Test Project

3.2% of applications pass

Each candidate is assigned a test project to evaluate whether they can “walk the walk.” Test projects take 1-3 weeks and are comprehensive and provide real-world scenarios for candidates to demonstrate their competence, thoroughness, professionalism, and integrity.

STEP 5

Continued Excellence

Top 3.0% of ONNX developers

As a quality-first company, we demand the best from our talent, so they can deliver the best to our clients. This principle permeates every Toptal engagement and delivered project. Only the top 3% of Developers can consistently perform at this level.

FAQs

Typically, you can hire ONNX developers with Toptal in about 48 hours. For larger teams of talent or full end-to-end project delivery, timelines may vary. Our talent matchers are highly skilled in the same fields they’re matching in—they’re not recruiters or HR reps. They’ll work with you to understand your goals, technical needs, and team dynamics, and match you with ideal candidates from our vetted global talent network.

Once you select your ONNX developer, you’ll have a no-risk trial period to ensure they’re the perfect fit. Our matching process has a 98% trial-to-hire rate, so you can rest assured that you’re getting the best fit every time.
To hire the right ONNX developer, it’s important to evaluate a candidate’s experience, technical skills, and communication skills. You’ll also want to consider the fit with your particular industry, company, and project. Toptal’s rigorous screening process ensures that every member of our network has excellent experience and skills, and our team will match you with the perfect ONNX developers for your project.
At Toptal, we thoroughly screen our ONNX developers to ensure we only match you with the highest caliber of talent. Of the more than 200,000 people who apply to join the Toptal network each year, fewer than 3% make the cut.

In addition to screening for industry-leading expertise, we also assess candidates’ language and interpersonal skills to ensure that you have a smooth working relationship.

When you hire ONNX developers with Toptal, you’ll always work with world-class, custom-matched ONNX developers ready to help you achieve your goals.
You can hire ONNX developers on an hourly, part-time, or full-time basis. Toptal can also manage the project end-to-end based on your specific requirements as part of our Consulting and Services offerings. Whether you hire a ONNX developer for a full- or part-time position, you’ll have the control and flexibility to scale your team up or down as your needs evolve. Our ONNX developers can fully integrate into your existing team for a seamless working experience.
We make sure that each engagement between you and your ONNX developer begins with a trial period of up to two weeks. This means that you have time to confirm the engagement will be successful. If you’re completely satisfied with the results, we’ll bill you for the time and continue the engagement for as long as you’d like. If you’re not completely satisfied, you won’t be billed. From there, we can either part ways, or we can provide you with another ONNX developer who may be a better fit and with whom we will begin a second, no-risk trial.

Toptal Lets You Hire Fast,
With Unparalleled Success

Trusted Talent Only
Our talent network is composed of thoroughly vetted professionals who ramp up quickly, function as essential team members, and deliver results.
Precise Matching
Our experienced talent matchers specialize in identifying talent that fits your needs. They work to understand your exact requirements and hand-select the best professionals for your project.
Seamless Hiring
We handle all aspects of billing, payments, and NDAs, streamlining the hiring process so you can focus on innovation, not overhead.
No-risk Trial Period
We want to be sure your engagement is a total success, so we offer a no-risk trial period. Work with your new hire for up to two weeks and pay only if you’re satisfied.
Effortless Scaling
We help you scale your team up or down as needed, with quick and efficient hiring in under 48 hours.
Flexible Engagements
Our flexible engagement models allow you to choose the engagement type that suits your needs and adjust it anytime: hourly, part time, or full time.