Hire the Top 3% of Online Transaction Processing (OLTP) Developers

Toptal is a marketplace for dedicated Online Transaction Processing (OLTP) Developers. Top companies and startups choose Toptal (OLTP) freelancers for their mission-critical development projects.

No-Risk Trial, Pay Only If Satisfied.

Hire Freelance Online Transaction Processing Developers and Engineers

Mikhail Fishzon

Freelance Online Transaction Processing Developer
United StatesToptal Member Since June 22, 2022

Mikhail is an alumnus of Google and Lyft and a data engineer who enjoys turning real-life business problems into scalable data platforms. Over the last two decades, he has helped companies architect, build, and maintain performance-optimized databases and data pipelines. Mikhail is knowledgeable in database optimization techniques and has achieved a 99% increase in slow-running query performance.

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Gabriel Breahna

Freelance Online Transaction Processing Developer
RomaniaToptal Member Since September 15, 2022

Gabriel has 20 years of experience installing, managing, and using SQL, NoSQL (key-value, columnar, graph), time-series, spatial, in-memory, and cloud databases. He's worked with 10TB OLTP databases, 10TB data warehouses, tables with 10+ billion rows, and databases with 10,000+ tables. He's built greenfield and brownfield apps, managed acquisitions, mergers, and spin-offs, and is proficient in Oracle, PostgreSQL, MySQL, Snowflake, BigQuery, Redshift, Synapse, MongoDB, Cassandra, and DynamoDB.

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Joris Laperre

Freelance Online Transaction Processing Developer
ThailandToptal Member Since January 27, 2022

Joris is a passionate problem solver with a wealth of experience in relational database design and development, and .NET coding. He was the principal database architect for Microsoft's extensive enterprise healthcare system for several years. More recently, he has been building business intelligence solutions focusing on metadata-driven solution generation. Joris prides himself on delivering exceptional quality work at record speed.

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Daphne Liu

Freelance Online Transaction Processing Developer
United StatesToptal Member Since June 18, 2020

Daphne is a highly motivated big data analytic architect and SQL/Tableau developer with strong business analytic solution delivery skills and 20 years of progressively responsible OLTP/OLAP database development/architecture experience. She is a frequent seminar speaker and workshop trainer in business intelligence and analytic solutions. Daphne is experienced collaborating with business users in data modeling and business analytic solutions.

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Vipen Koul

Freelance Online Transaction Processing Developer
United StatesToptal Member Since June 18, 2020

Vipen is a highly experienced database warehouse, development, and performance professional with comprehensive knowledge of OLAP and OLTP databases. Vipen has worked as a data architect, data modeler, ETL developer, database developer, and data analyzer utilizing Vertica, Teradata, Netezza, Oracle, and SQL Server, as well as Snowflake and Python.

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Bogdan Beca

Freelance Online Transaction Processing Developer
RomaniaToptal Member Since May 4, 2021

Bogdan has 20+ years of hands-on experience with enterprise-level systems, delivering tens of large projects for top organizations in energy, pharma, telco, eCommerce, banking, and the public sector. As a solutions architect, Bogdan can drive a solution from concept to production or provide end-to-end POCs (or MVPs) regarding solution architecture, design, development, and release pipelines.

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Iván Guillermo Aldana

Freelance Online Transaction Processing Developer
ArgentinaToptal Member Since April 16, 2019

Along with having a bachelor's degree in systems engineering from Universidad Tecnologica Nacional, Iván has more than 15 years of experience working with 24x7 databases and over a billion concurrent users. He not only has hands-on experience in database design but also is quiet good at administration and development. Ivan has an analytical vision like few others and excels at taking on new and complex challenges.

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Allan Kote

Freelance Online Transaction Processing Developer
South AfricaToptal Member Since November 3, 2022

Allan is a data engineer with 15 years of hands-on experience in data analytics and business intelligence. Having worked as a data specialist for diverse companies, both as an internal team member and a freelancer, he has acquired extensive knowledge about the latest technology in the field. Allan also has excellent written and oral communication skills, a passion for learning, and a strong will to keep increasing his technical skill set.

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Rade Pobulic

Freelance Online Transaction Processing Developer
SerbiaToptal Member Since June 18, 2020

Rade has three decades of experience with Oracle products (database, tools, applications, middleware, and business intelligence). With so many years of hands-on, in-depth experience under his belt, it can safely be said that Rade is a world-class expert in Oracle databases, SQL tuning, and development. Recently, he's been working on Oracle E-Business Suite customization and tuning.

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Anthony Harper

Freelance Online Transaction Processing Developer
United StatesToptal Member Since July 3, 2022

Anthony is a database designer and developer with 10+ years of experience in large Oracle PL/SQL implementations. He is proficient in Oracle database architecture, using PL/SQL programs to support application clients, ETL processes, and web services. Anthony is skilled in developing and optimizing tables, indexes, packages, triggers, views, procedures, and functions to keep business logic in the database. He is committed to mastering new functionality in the field to deliver the best solutions.

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Dhruvi Pandya

Freelance Online Transaction Processing Developer
IndiaToptal Member Since September 1, 2023

Dhruvi is a data engineering professional with seven years of industry experience who started as a back-end developer. Her expertise lies in building, maintaining, and optimizing data pipelines, mostly with stacks such as Spark, Airflow, Storm, Snowplow, Docker, and Kafka. She has hands-on experience with AWS services like EC2, EMR, Elastic Beanstalk, Athena, and Redshift. Dhruvi is also well-versed in Agile development and sprint planning methodologies.

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Discover More Online Transaction Processing Developers in the Toptal Network

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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 Online Transaction Processing 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 Online Transaction Processing developer for your project. Average time to match is under 24 hours.
3

The Right Fit, Guaranteed

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

FAQs

  • How are Toptal Online Transaction Processing developers different?

    At Toptal, we thoroughly screen our Online Transaction Processing 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 Online Transaction Processing developers in less than 48 hours through Toptal?

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

  • What is the no-risk trial period for Toptal Online Transaction Processing developers?

    We make sure that each engagement between you and your Online Transaction Processing 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.

Top Online Transaction Processing Developers Are in High Demand.

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