Hire the Top 3% of Freelance UML Developers

Toptal is a marketplace for top UML developers, engineers, programmers, coders, architects, and consultants. Top companies and startups choose Toptal UML freelancers for their mission-critical software projects.

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Clients Rate Toptal UML Developers4.6 / 5.0on average across 5 reviews as of Dec 6, 2023

Hire Freelance UML Developers and Engineers

Shane Freed

Freelance UML Developer
United StatesToptal Member Since April 9, 2021

Shane is a Java developer with 25 years of experience building enterprise apps and specializes in writing maintainable, extensible, SOLID code. While 95% of Shane's experience is in the Java realm, his passion is full-stack development with Angular. Shane's served in many different roles, including architect, team lead, lead developer, and individual contributor. While Shane doesn't always have to lead a project, his USMC background makes him perfect for lead roles and mentoring.

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Joanna Chimiak-Opoka

Freelance UML Developer
AustriaToptal Member Since January 22, 2016

Joanna has a PhD in computer engineering and more than 20 years of experience in the foundations of software development from industrial and academic settings. She was involved in the development of one of the first fully automated web hosting systems in Poland. Her main focus in academic work was on model and quality engineering. Joanna has excellent analytic and abstracting skills. Plus, she learns quickly and communicates well.

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Olaf Luetkehoelter

Freelance UML Developer
United StatesToptal Member Since September 11, 2021

Olaf is a DevOps engineer with 20+ years of experience in programming languages; database systems; and automation, monitoring, and analytics tools. His enterprise experience includes Cisco, CompuCom, IBM, BMC, and UNC, and his roles include head of software development, lead architect, team lead on consulting engagements, and client-facing solution architect in sales situations. Olaf loves developing software, especially automation solutions, and his pragmatic approach always delivers value.

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A. Rosa Castillo, PhD

Freelance UML Developer
SpainToptal Member Since September 29, 2022

Rosa is a full-stack developer and data scientist with a PhD, solid research skills, and extensive software engineering experience. Combining the academy and industry approaches to data sciences, she can contribute to the whole data pipeline—from exploratory data analysis to prototyping and production. Rosa has also efficiently worked on projects across different countries using her professional English, Italian, German, and Spanish proficiency.

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Jose Martinez

Freelance UML Developer
United StatesToptal Member Since May 22, 2023

Jose is a senior Java software developer with over 20 years of experience. He has professional experience in object-oriented analysis and design and expertise in many Jakarta EE APIs. He is fluent in English and Spanish with many years of experience in the US Federal, The Department of Defense, and military service. Jose is a hard-working, honest, decorated veteran with several certifications, awards, and security clearances.

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Maksym Karashchuk

Freelance UML Developer
PolandToptal Member Since October 14, 2022

Max is a professional data architect and engineer with almost seven years of experience. With solid programming and excellent communication skills, he has successfully finished multiple long-term projects as a tech lead or senior data engineer. Max is passionate about warehouse automation using metadata-driven ETL. He is a people person who always finds time to guide and advise other colleagues.

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Michel Meneses

Freelance UML Developer
BrazilToptal Member Since August 8, 2023

Michel is a senior AI/ML engineer with comprehensive experience leveraging the latest AI research into development across multiple domains. With a solid technical background in ML and software engineering, Michel has assisted enterprises in successfully prototyping, benchmarking, and developing cutting-edge AI systems used by millions worldwide while authoring innovative scientific papers and patents.

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Gokhan Yaliniz

Freelance UML Developer
TurkeyToptal Member Since August 29, 2022

Gokhan is a talented software engineer, architect and team lead with over nine years of experience designing, coding, and testing complex software systems. His areas of expertise include full-stack application development, C/C++, Qt, QML, Linux, Python, JavaScript, software architecture, and computer vision. Gokhan worked on the application software development of computer vision and electro-optical systems and developed in-house SaaS tools. He also loves automating processes.

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Fábio Vasques

Freelance UML Developer
BrazilToptal Member Since December 30, 2021

Fábio is a passionate professional working in the IT field for over 20 years. He has extensive knowledge in SQL, procedural languages ​​for several RDBMS, data modeling, and data pipelines using a high diversity of technologies. He is also keen on agile practices, iterative and incremental methodologies, and formal methods for highly complex systems development. Fábio has a proven track record of successfully managing teams in projects and strategic areas involving technology.

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Piotr Poznanski

Freelance UML Developer
PolandToptal Member Since August 2, 2021

Piotr is a software developer, architect, and technical lead with 23+ years of experience working with CERN, Motorola Solutions, universities, and more. He has led projects, served as a scrum master, and developed and delivered complex web and mobile solutions, including business and technical requirements, architecture, 3rd-party API integrations, data acquisition, and processing for BI. Piotr co-developed the pan configuration language and has a PhD in computer science.

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Edward Kench

Freelance UML Developer
United StatesToptal Member Since June 18, 2020

Edward is an Azure data and AI architect expert in streaming, real-time, big data, data lake, warehouse, lake house, and ML architectures on modern cloud data and AI platforms. He has experience in architecting predictive analytics, business intelligence, big data architectures, IoT and signal data, and cloud transformation, modernization, and migration. Working in finance, retail, and market research industries, Edward is a thought leader in data with solid math and analytical skills.

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... 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
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

I am more than pleased with our experience with Toptal. The professional I got to work with was on the phone with me within a couple of hours. I knew after discussing my project with him that he was the candidate I wanted. I hired him immediately and he wasted no time in getting to my project, even going the extra mile by adding some great design elements that enhanced our overall look.

Paul Fenley

Director

The developers I was paired with were incredible -- smart, driven, and responsive. It used to be hard to find quality engineers and consultants. Now it isn't.

Ryan Rockefeller

CEO

Toptal understood our project needs immediately. We were matched with an exceptional freelancer from Argentina who, from Day 1, immersed himself in our industry, blended seamlessly with our team, understood our vision, and produced top-notch results. Toptal makes connecting with superior developers and programmers very easy.

Jason Kulik

Co-Founder

As a small company with limited resources we can't afford to make expensive mistakes. Toptal provided us with an experienced programmer who was able to hit the ground running and begin contributing immediately. It has been a great experience and one we'd repeat again in a heartbeat.

Stuart Pocknee

Principal

How to Hire UML Developers Through Toptal

1

Talk to One of Our Industry Experts

A Toptal director of engineering 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 UML developer for your project. Average time to match is under 24 hours.
3

The Right Fit, Guaranteed

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

Find Experts With Related Skills

Access a vast pool of skilled developers in our talent network and hire the top 3% within just 48 hours.

FAQs

  • How are Toptal UML developers different?

    At Toptal, we thoroughly screen our UML developers to ensure we only match you with talent of the highest caliber. Of the more than 200,000 people who apply to join the Toptal network each year, fewer than 3% make the cut. You’ll work with engineering experts (never generalized recruiters or HR reps) to understand your goals, technical needs, and team dynamics. The end result: expert vetted talent from our network, custom matched to fit your business needs.

  • Can I hire UML developers in less than 48 hours through Toptal?

    Depending on availability and how fast you can progress, you could start working with an UML developer within 48 hours of signing up.

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

    We make sure that each engagement between you and your UML 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 expert who may be a better fit and with whom we will begin a second, no-risk trial.

Tap Into World-Class Talent

  • Trusted Experts Only

    Trusted Experts Only

    All of our talent are seasoned experts who ramp up quickly, readily contribute as core team members, and work with you to minimize onboarding time.

  • The Right Fit

    The Right Fit

    We have a knack for matching you with the right fit. Start working with your new hire on a no-risk trial period, paying only if satisfied.

  • Scale as Needed

    Scale as Needed

    Hire talent within 48 hours and scale your team up or down as needed, no strings attached.

  • Seamless Hiring

    Seamless Hiring

    We handle all aspects of billing, payments, and NDA’s. Let us take care of the overhead while you focus on building great products.

  • Flexible Engagements

    Flexible Engagements

    Choose the engagement type that suits your needs — hourly, part-time, or full-time — with the ability to change anytime.

  • Expert Talent Matching

    Expert Talent Matching

    Focus on your project and enjoy support from your dedicated account executive and expert talent matcher.

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