Hire the Top 3% of Freelance Haystack Engineers

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

No-Risk Trial, Pay Only If Satisfied.

Hire Freelance Haystack Engineers

Allen Gary Grimm

Freelance Haystack Engineer
United StatesToptal Member Since November 5, 2014

Fascinated by the intersection of abstraction and reality, Allen found his calling in data science. Formally trained in machine learning plus a breadth of experience in applying ML as prototypes up through production, his specialty is in finding and implementing tractable solutions to complex data modeling problems: e.g., user behavior prediction, recommender systems, NLP, spam filters, deduplication, or feature engineering.

Show More

Angela Pfeffer

Freelance Haystack Engineer
United StatesToptal Member Since January 25, 2019

Angela is a software engineer with a background in mechanical engineering. She's been involved in a number of startups as well as having designed software to remotely control and improve the efficiency of large-scale heating and cooling systems. Angela is very skilled with React, Angular, TypeScript, HTML, Cordova, and Ionic.

Show More

Andrey Sinitsyn

Freelance Haystack Engineer
ItalyToptal Member Since September 2, 2014

Andrey is a developer with more than 15 years of experience in various projects, including advertising, social networks, CRM, and complex sectoral projects. Andrey has worked at all levels of responsibility, from being a developer to chief technical officer.

Show More

Filipe Waitman

Freelance Haystack Engineer
NetherlandsToptal Member Since December 15, 2015

Since 2010, Filipe has been developing with Python​ and its web frameworks. An Agile methodology enthusiast, he has worked as both a team technical leader and as a scrum master. At the moment, he is aiming to work in Europe, but any project that challenges him and where he can work remotely is more than welcome. Filipe communicates and collaborates well with teams of all sizes.

Show More

Kevin Sparks

Freelance Haystack Engineer
New ZealandToptal Member Since January 23, 2014

Kevin loves to build software for companies in the pre-product/market fit stage because that's where he believes true innovation lies. He's self-motivated with a bias for action and has proven experience in delivering software that is fit for use. He values relationships with people, autonomous systems, and Vim. In terms of tech, Kevin is proficient in full-stack Python and JavaScript, NLP, prompt engineering, Docker, AWS, Postgres, MySQL, React, React-Admin, GraphQL, Hasura, Django, and Git.

Show More

Michał Żelazkiewicz

Freelance Haystack Engineer
PolandToptal Member Since March 29, 2019

Michał is a highly experienced and dedicated Python software developer with over 13 years of expertise developing robust and scalable web applications and APIs. He is committed to continuously improving his skills through daily self-study and learning new technologies to stay ahead in the industry. Currently pursuing interests in machine learning, data mining, and artificial intelligence, Michał is passionate about innovative solutions that drive positive change in the world.

Show More

Pedro Lima

Freelance Haystack Engineer
PortugalToptal Member Since September 27, 2017

Pedro is a software developer and architect specializing in data science, machine learning, and AI. He has extensive experience in the end-to-end process of conceiving, designing, developing, and deploying data applications for large companies and startups.

Show More

Jakub Paczkowski

Freelance Haystack Engineer
PolandToptal Member Since January 29, 2014

Jakub is an experienced director of engineering with a decade of programming in Python and leadership expertise. He is passionate about harnessing the power of technology to drive business transformation and growth. With a rich professional journey that includes Python development, team leadership, and strategic management, Jakub prides himself on bridging the gap between business and technology.

Show More

Ivan Bestvina

Freelance Haystack Engineer
CroatiaToptal Member Since April 2, 2020

With over seven years of data science and over nine years of coding experience, Ivan has developed a wide range of data and AI products for startups and large companies. He has a proven record of managing development and data science teams and enjoys building products from the ground up. He specializes in large language models, predictive modeling, network science, and anomaly detection and has excellent communication skills and attention to detail.

Show More

Kirill Stepanov

Freelance Haystack Engineer
TaiwanToptal Member Since October 15, 2018

Kirill has been making a living as a developer since 2012. He's worked with the usual range of web technologies, including a bit of front-end development, but most of his development experience has been in PHP and Python, including Django and Flask. Kirill also has a wealth of certified experience working remotely and successfully delivering projects.

Show More

Bhoumik Shah

Freelance Haystack Engineer
IndiaToptal Member Since September 13, 2022

Bhoumik is a machine learning and operations research specialist with six years in AI, notably in ads moderation, linehaul cost optimization, and McKinsey's routing tool. He's excelled in cost reduction and system efficiency, adept with jsprit, OR-Tools, and ML model development. With both a bachelor's and master's degree in mechanical engineering, with a focus on operations research, Bhoumik also holds certifications in deep learning and related fields.

Show More

Discover More Haystack Engineers in the Toptal Network

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
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 Haystack Engineers 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 Haystack engineer for your project. Average time to match is under 24 hours.

The Right Fit, Guaranteed

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


  • How are Toptal Haystack engineers different?

    At Toptal, we thoroughly screen our Haystack engineers 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 Haystack engineers in less than 48 hours through Toptal?

    Depending on availability and how fast you can progress, you could start working with a Haystack engineer within 48 hours of signing up.

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

    We make sure that each engagement between you and your Haystack engineer 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 Haystack Engineers Are in High Demand.

Start Hiring