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Hire the Top 3% of Ontology Developers

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

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

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Kaushik Jeyaraman

Ontology Developer
UTC-08:00
Canada
Toptal Member Since April 16, 2026

Kaushik is a senior AI/ML engineer and tech lead with nearly 7 years of experience building production AI platforms across GenAI, semantic search, document intelligence, and MLOps. He specializes in turning ambiguous business problems into reliable, user-facing solutions in regulated enterprise environments. He has hands-on experience in Palantir Foundry/AIP, governed data workflows, scalable GenAI systems, and forward-deployed delivery.

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Arian Fernandez Rodriguez

Ontology Developer
UTC-05:00
Peru
Toptal Member Since March 31, 2026

Arian is a senior data engineer based in Lima. He specializes in Palantir Foundry, ontology modeling, workshop modules, PySpark pipelines, and TypeScript action types. With 4+ years of experience across fintech and retail, he has hands-on experience across the modern data stack, including AWS, Azure, Airflow, and Databricks.

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Carlos Quiros

Ontology Developer
UTC-05:00
United States
Toptal Member Since December 24, 2025

Carlos is a senior digital architect and software engineer with over 20 years of experience designing and scaling data-driven platforms. He specializes in Python back ends, data architecture, and analytics-ready systems, and has led complex, multi-country programs from concept to production. Known for clean architectures, robust data models, and senior-level technical leadership, Carlos consistently delivers high-impact solutions.

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Saireddy Nuthula

Ontology Developer
UTC-05:00
Canada
Toptal Member Since April 16, 2026

Saireddy is a results-driven data engineer specializing in scalable data platforms, pipeline optimization, and data governance. He's experienced in leveraging Palantir Foundry and Python to design efficient ETL workflows, integrate complex data sources, and improve system performance. Known for partnering with cross-functional stakeholders to deliver high-quality solutions, he secures data solutions that power analytics and strategic decision-making.

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Stylianos Kampakis

Ontology Developer
UTC+00:00
United Kingdom
Toptal Member Since January 17, 2019

Dr. Stylianos Kampakis is an expert data scientist living and working in London. He has a Ph.D. in machine learning from the University College London and an MSc in informatics from The University of Edinburgh. He is a member of the Royal Statistical Society and the UCL Blockchain Centre. His skills include machine learning, statistical analysis, deep learning, natural language, and Bayesian statistics.

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Ahmad Tayel

Ontology Developer
UTC+01:00
Spain
Toptal Member Since May 28, 2026

Ahmad is a senior data analyst with over 6 years of experience in fintech, payments, and growth analytics. His expertise spans BigQuery, dbt, Tableau, and Looker, with notable work at Tabby, Calo, Paymob, and Bypa-ss. He built onboarding dashboards to reduce ad-hoc requests and led initiatives, achieving up to 50% YoY revenue impact.

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Shola Dada

Ontology Developer
UTC+01:00
Nigeria
Toptal Member Since September 16, 2022

Shola is a senior data engineer with over five years of experience in banking, finance, advertising, and media. His expertise revolves around designing robust data pipelines and data warehouses, both on-premises and in the cloud. Shola is highly skilled in several out-of-the-box ETL and ELT tools, such as ODI, SSIS, and Talend, and is fluent in SQL, Python, and PySpark.

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Valentin Shilin

Ontology Developer
UTC+01:00
Germany
Toptal Member Since April 14, 2026

Valentin is a Palantir architect at Deutsche Telekom Services specializing in data architecture, big data, and AI-driven solutions. He delivers scalable data platforms, builds high-performance data pipelines, and develops AI-powered systems that enable data-driven decision-making. With strong expertise in Apache Spark and Python, Valentin also teaches at OTUS, helping engineers build production-ready skills. Based in Germany, he combines hands-on experience with mentoring.

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Moustafa Amer

Ontology Developer
UTC+01:00
Netherlands
Toptal Member Since January 10, 2024

Moustafa is a senior data and analytics engineer with 7+ years of experience building scalable data platforms at Shimano Europe and Henkel. Stack: dbt (Cloud/Core), Kimball Dimensional, Data Vault, Medallion Architecture. Cloud: Azure (Databricks, Delta Lake, ADF, ADLS) and GCP (BigQuery, Cloud Composer, Dataflow, Looker). Advanced SQL, Python (Pandas, PySpark, scikit-learn), Power BI, Tableau. Skilled in Claude and Claude Agents for workflow automation, CI/CD, DataOps, and data governance.

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Lakshya Chadda

Ontology Developer
UTC+05:00
India
Toptal Member Since April 2, 2026

Lakshya is a senior data engineer with nearly 6 years of experience architecting and delivering enterprise-scale data lakehouse platforms using Azure Databricks, PySpark, and Delta Lake across healthcare and financial services. He specializes in LLMs, RAGs, and knowledge-driven data automation frameworks, with proven expertise in designing Medallion architecture pipelines, orchestrating complex ELT workflows with ADF, and building governed enterprise data lakes supporting large-scale analytics.

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Ritwik Math

Ontology Developer
UTC+05:00
India
Toptal Member Since September 25, 2026

Ritwik has spent over 10 years building agentic AI solutions across the supply chain, telecom, and fintech sectors. His toolkit centers on Python, LangChain, and Neo4j. While at GlobalLogic, Ritwik reduced inference costs by 35% through optimized LLM workflows and database-native retrieval.

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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
Conor Kenney
Creating an app for the game
Leading a digital transformation
Elmar Platzer
Leading a digital transformation
Building a cross-platform app to be used worldwide
Building a cross-platform app to be used worldwide
Drilling into real-time data creates an industry game changer
Drilling into real-time data creates an industry game changer
Testimonials

How to Hire Ontology Engineers Through Toptal

1

Talk to One of Our Client Advisors

A Toptal client advisor will work with you to understand your goals, technical needs, and team dynamics.
2

Work With Hand-selected Talent

Within days, we’ll introduce you to the right Ontology developer for your project. Average time to match is under 24 hours.
3

The Right Fit, Guaranteed

Work with your new Ontology engineer 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 Ontology 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.

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FAQs

  • Typically, you can hire Ontology 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 Ontology engineer, 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 Ontology 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 Ontology developers for your project.

  • At Toptal, we thoroughly screen our Ontology engineers 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 Ontology developers with Toptal, you’ll always work with world-class, custom-matched Ontology developers ready to help you achieve your goals.

  • You can hire Ontology engineers 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 Ontology 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 Ontology developers can fully integrate into your existing team for a seamless working experience.

  • We make sure that each engagement between you and your Ontology 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 Ontology 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

    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

    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

    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

    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

    Effortless Scaling

    We help you scale your team up or down as needed, with quick and efficient hiring in under 48 hours.

  • Flexible Engagements

    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.

Top Ontology Developers Are in High Demand.

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