Hire the Top 3% of Freelance Cryptographers

Toptal is a marketplace for dedicated Cryptographers. Top companies and startups choose Toptal Cryptography freelancers for their mission-critical Cryptography development projects.

No-Risk Trial, Pay Only If Satisfied.

Trusted by leading brands and startups

Hire Freelance Cryptographers

Onur Codur

Freelance Cryptographer
Toptal Member Since November 14, 2022

Onur is an enthusiastic and passionate security engineer who likes to work predominantly as a security architect to provide strategic direction to the development and operational teams to identify security weaknesses in their solution designs and drive the adoption of security best practices. He believes that security is one of the key driving factors in maintaining the reputation and quality of an organization and its services.

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Julie Wetherbee

Freelance Cryptographer
United States
Toptal Member Since August 21, 2015

Julie has over 20 years of experience building software applications and leading engineering teams for businesses of all sizes. She has expertise in Java, JavaScript, C, C++, and Perl, and is familiar with many popular frameworks. Recently, Julie designed and implemented a large-scale Oracle database sharding solution for Walmart.com.

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Ariel Maiorano

Freelance Cryptographer
Toptal Member Since March 28, 2022

Ariel has more than 20 years of experience in professional information security and software development, including working on projects ranging from small applications to complex enterprise solutions. He focuses mainly on back-end security and development in C, C++, Java, .NET platform, Python, PHP, Perl, and shell scripting, with databases like MySQL, PostgreSQL, MS-SQL, Oracle, MongoDB, and SQLite. Ariel has a great hands-on background in commercial and open-source frameworks and environments.

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Meghana Bhange

Freelance Cryptographer
Toptal Member Since October 27, 2022

Meghana is a machine learning engineer with a passion for solving problems in a data-driven manner. She is currently pursuing her Master's Degree with a research focus on privacy-preserving technologies at the Trustworthy Information Systems Lab, ÉTS Montréal. She has experience in natural language processing and has previously published work at SemEval-2020. Meghana is passionate about working on creative projects and always looks for new ways to apply her skills.

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Gaurang Singh

Freelance Cryptographer
United States
Toptal Member Since September 16, 2022

Gaurang is a front-end developer with three years of experience at Oracle Corporation and the Defence Research and Development Organisation (DRDO), possessing practical problem-solving skills. He enjoys a new challenge and has experienced teams of all sizes. Gaurang is a strategic planner who values integrity, humility, and teamwork.

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Maria Boldyreva

Freelance Cryptographer
Toptal Member Since September 28, 2021

Maria is a senior full-stack developer with over five years of professional experience in Python and JavaScript. Her expertise includes developing and deploying web applications, planning architecture and migrations, designing end-to-end solutions, and gathering requirements together with a client. Maria likes building new and improving old applications. She has excellent communication skills and works well as an individual developer as well as in a team.

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Will Beddow

Freelance Cryptographer
United States
Toptal Member Since May 19, 2021

Will is an experienced and passionate full-stack developer. He's been freelancing since 2014 and prides himself on communication, flexibility, and a range of skills. His past projects include everything from satellite data analysis and ride-sharing apps to AI-driven industrial automation. Professionally, he's worked in startups and small businesses as small as three people and for organizations as large as the federal government.

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Esteve Badia Orive

Freelance Cryptographer
Toptal Member Since April 4, 2022

Esteve has 10+ years of experience in the software industry, mainly working in edtech and financial software. With a background in maths and computer engineering, he combines solid skills in the full technology stack for the web—handling algorithms, APIs, storage, DevOps, and user interfaces—with management and executive expertise. Esteve has contributed to advancing online learning technologies for maths and science and developed an open-source app for community currency management.

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Afonso de Sá Delgado Neto

Freelance Cryptographer
Toptal Member Since April 26, 2021

Afonso is a software engineer with 3+ years of experience developing end-to-end back-end services. With solid skills in cryptography and machine learning, he has also performed complex data analysis in big data scenarios. Afonso brings a challenge-driven mindset, strong focus, and curiosity to solving real-world problems, using the best practices available.

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Tonny Pham

Freelance Cryptographer
Toptal Member Since February 23, 2023

Tonny is a systems architect and full-stack developer with 14 years of experience. He worked on various services, including financial and eCommerce systems, as well as c100k real-time games. Tonny is a specialist in developing high-scale distributed systems with a focus on maintaining the highest levels of information security and privacy. He thrives on tackling new challenges and excels at problem-solving. Tonny is also highly self-motivated and adept at working with global teams.

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Indra Kurniawan

Freelance Cryptographer
Toptal Member Since September 30, 2021

Indra is a senior software developer with 12 years of commercial development experience. He is fully conversant with the software development lifecycle and test-driven development techniques while excelling in several programming languages and technologies, including Go, PHP, C#, .Net WPF, ASP.NET MVC, JavaScript, and Python. Indra's key strength is deconstructing complex problems into manageable components while helping teams achieve project outcomes in an agile development environment.

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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
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


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


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


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


How to Hire Cryptographers Through Toptal


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.

Work With Hand-Selected Talent

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

The Right Fit, Guaranteed

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


  • How quickly can you hire with Toptal?

    Typically, you can hire a Cryptographer with Toptal in about 48 hours. For larger teams of talent or Managed 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 Cryptographer, 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.

  • How do I hire a Cryptographer?

    To hire the right Cryptographer, 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 Cryptographers for your project.

  • How are Toptal Cryptographers different?

    At Toptal, we thoroughly screen our Cryptographers 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 a Cryptographer with Toptal, you’ll always work with world-class, custom-matched Cryptographers ready to help you achieve your goals.

  • Can you hire Cryptographers on an hourly basis or for project-based tasks?

    You can hire a Cryptographer on an hourly, part-time, or full-time basis. Toptal can also manage the entire project from end-to-end with our Managed Delivery offering. Whether you hire an expert 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 Cryptographers can fully integrate into your existing team for a seamless working experience.

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

    We make sure that each engagement between you and your Cryptographer 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.

Top Cryptographers Are in High Demand.

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