Hire the Top 3% of Freelance SS7 Engineers

Toptal is a marketplace for dedicated SS7 Engineers. Top companies and startups choose Toptal SS7 freelancers for their mission-critical development projects.

No-Risk Trial, Pay Only If Satisfied.

Hire Freelance SS7 Engineers

Thomas Cashman

Freelance SS7 Engineer
IrelandToptal Member Since January 10, 2022

Thomas is an expert Java, C#, and JavaScript software engineer and technical architect. He has 10+ years of professional experience working as a developer and technical consultant in various projects and managing agile-based development teams. Thomas is keen on high-reliability and high-performance applications across multiple industries, including telecom, financial, pharma, and entertainment.

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Halim Gebrael

Freelance SS7 Engineer
LebanonToptal Member Since May 17, 2021

Halim is a site reliability engineer and expert in architecting and maintaining AWS cloud-based solutions. He's specialized in designing and leading data migrations from legacy data centers to AWS and VMware public cloud platforms. Halim installed and integrated a highly complex call completion platform that improved the voicemail experience for users while increasing company profit. He is passionate about automation, orchestration, and DevOps and has created multiple CI/CD pipelines.

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Darko Kulic

Freelance SS7 Engineer
SerbiaToptal Member Since September 27, 2018

Darko is a software architect who has more than 12 years of professional experience. He is always looking to increase his knowledge and expertise with a willingness to dive into the unknown. Darko has most recently worked on applying modern distributed systems, cryptography, and blockchain theory to solving SSI-related problems.

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Ryder Lewis

Freelance SS7 Engineer
United StatesToptal Member Since August 28, 2018

Ryder has 20 years experience building and maintaining large-scale transaction processing platforms (built on Linux, PostgreSQL, Python, and C++), in which performance, reliability, and uptime are equally critical. He has co-founded and architected platforms for three technology companies over his career and is comfortable filling many technical roles in small teams and large teams alike. He communicates well and is meticulous in all his work.

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Sergey Smyshlyaev

Freelance SS7 Engineer
SerbiaToptal Member Since July 29, 2021

Sergey is a senior software developer with 12+ years of experience. For the past six years, he has focused on web applications with React and mobile applications with React Native. He has worked on projects that now serve millions of customers and is passionate about finding solutions to complex problems. Sergey is always looking for challenging projects where his technical skills can have an impact.

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Richard Sinden

Freelance SS7 Engineer
United KingdomToptal Member Since November 8, 2022

Richard is a software developer with over twenty years of experience whose main area of expertise is developing the Microsoft .NET platform. His specialty is Windows desktop applications and designing user-friendly UI/UX. He is also adept at working with the API, business, data access, and storage layers. Richard is comfortable working throughout the entire software development lifecycle, from requirements analysis and design to testing, deployment, and support.

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Tomáš Hykel

Freelance SS7 Engineer
Czech RepublicToptal Member Since May 19, 2020

Tomas is a well-rounded senior back-end developer with several years of diverse professional experience across various engineering cultures, product fields, and technology stacks. Formerly employed by Amazon in Ireland, EclecticIQ in Amsterdam, and the biggest Czech web service company, Tomas specializes in the testability and maintainability of code, clean APIs, and microservice-based environments.

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Atanas Kozhuharov

Freelance SS7 Engineer
BulgariaToptal Member Since September 11, 2018

Atanas has several years of development experience with particular expertise in system and network administration and integrating continuous delivery and continuous integration processes into development workflows. Atanas also possesses considerable experience with several tools to achieve the tasks mentioned above, but he considers his analytical approach to problem-solving his strongest skill.

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Robert Oliveira

Freelance SS7 Engineer
IrelandToptal Member Since February 15, 2016

Robert has more than two decades of development experience most of which has been in the telecommunications industry. He's written firmware for telecommunication equipment for Brazilian carriers, PBX for the USA market, and IVR and CTI systems. Currently, he works for Arista and recently, he was working as the principal software architect for an internet company in Dublin writing code on a 50/50 basis.

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Discover More SS7 Engineers in the Toptal Network

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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 SS7 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 SS7 engineer for your project. Average time to match is under 24 hours.

The Right Fit, Guaranteed

Work with your new SS7 engineer for a trial period (pay only if satisfied), ensuring they're the right fit before starting the engagement.


  • How are Toptal SS7 engineers different?

    At Toptal, we thoroughly screen our SS7 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 SS7 engineers in less than 48 hours through Toptal?

    Depending on availability and how fast you can progress, you could start working with a SS7 engineer within 48 hours of signing up.

  • What is the no-risk trial period for Toptal SS7 engineers?

    We make sure that each engagement between you and your SS7 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 SS7 Engineers Are in High Demand.

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