Based in Greece, Rational Data has been delivering software development services to clients around the world since 2020.
We’re experts in end-to-end software development: backend & frontend, manual & automation testing, DevOps, UI/UX, and business analysis.
Our client portfolio spans fintech, banking, public sector ICT, enterprise software, digital mapping, HR management, robotics, merchandise, and beyond.
When you partner with Rational Data, you’re teaming up with a small but dedicated group of seasoned professionals who go the extra mile to deliver the results you expect. Whether you want to build software from scratch, expand your in-house team, or outsource an entire development crew, we’ve got you covered.
Engagement models
Team Augmentation: Our professionals integrate into your in-house team.
Project Outsourcing: From concept to code to go-live, our team completes your software project.
Managed Team: Our senior engineers work exclusively on your projects, led by an expert team leader reporting to your project manager.
Build-Operate-Transfer (BOT): We set up and run a development center for you in Greece, from forming the legal entity to reaching operational maturity – at which point you take the reins.
Managed Services: Ongoing support on a specific domain like QA testing or UI/UX, on a fractional monthly basis.
What we stand for
✓ Onboarding exclusively senior software engineers with proven domain expertise.
✓ A 360° approach that combines technical know-how with entrepreneurial insight for excellent execution.
✓ Filling positions in 1–3 weeks.
✓ Recruiting on demand for perfect fit every time.
✓ Western European-level skills at more competitive rates, without sacrificing work ethic standards or English fluency.
✓ Granting access to Greece’s 180,000+ IT professionals.
✓ Flexible, tailored services without vendor lock-in.
✓ Honest practices with no overpromising or overselling.
✓ Prioritizing employee well-being and keeping turnover low.
Min project size
$10,000+
Hourly rate
$50 - $99 / hr
Employees
10 - 49
Year founded
Founded 2020
No have been added yet...
Pricing Snapshot
Min. project size
$10,000+
Avg. hourly rate
$50 - $99
/hr
Rating for cost
5
/5
What Clients Have Said
Rational Data offers good value for cost, with clients praising their pricing fit and quality of work. Projects typically involve team augmentation with 1-5 engineers, delivering on time and within budget.
None of the clients identified any areas for improvement or issues with Rational Data's services. Feedback was overwhelmingly positive, with clients expressing satisfaction with all aspects of their projects.
Effective Communication and Responsiveness
Clients noted Rational Data's effective communication and quick responsiveness. Regular updates and direct communication channels ensured a smooth workflow and stress-free collaboration.
Impressive Talent Pool Access
Clients were impressed by Rational Data's ability to present numerous qualified candidates quickly. This capability was highlighted as a significant advantage, especially for startups needing rapid team expansion.
Successful Team Augmentation
Rational Data effectively augmented teams for clients by recruiting and providing skilled developers. Clients appreciated the quality of the professionals and the seamless integration into their existing teams, helping achieve project goals efficiently.
Positive Client Relationships
Rational Data maintained excellent client relationships, marked by cultural fit and professional interactions. Clients appreciated the straightforward, no-nonsense approach, fostering trust and satisfaction.
Staff Augmentation for Mobile Robotics Automation Company
IT Staff Augmentation
$10,000 to $49,999
Jan. 2024 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0
"We were quite impressed by the number of engineers they were able to reach."
Nov 26, 2025
CTO, Floxmind
Quirino Zagarese
Verified
Other industries
London, England
1-10 Employees
Online Review
Verified
Rational Data has augmented the development team of a mobile robotics automation company. The team has recruited candidates for the client to select and screened them for the initial technical interviews.
The client has been pleased with the quality of work delivered by the engineer who has been added to their team. Rational Data has a responsive team that delivers work on time. The client has been impressed by the number of engineers Rational Data has reached out to in such a short period of time.
The client submitted this review online.
BACKGROUND
Please describe your company and position.
I am the CTO of Floxmind
Describe what your company does in a single sentence.
FloxMind specializes in mobile robotics automation designed for 3PLs, distribution centers, and manufacturing, offering software that integrates robots and enhances operational efficiency.
OPPORTUNITY / CHALLENGE
What specific goals or objectives did you hire Rational Data to accomplish?
We hired Rational Data for team augmentation because we had difficulty finding good talent at a good price in the UK as a startup. Our goal was to expand the core development team with senior developers who can work independently on our product without the need for training or direct supervision.
SOLUTION
How did you find Rational Data?
Referral
Why did you select Rational Data over others?
Pricing fit our budget
Great culture fit
Referred to me
How many teammates from Rational Data were assigned to this project?
1 Employee
Describe the scope of work in detail. Please include a summary of key deliverables.
I wanted to set up a team of independent senior developers in Greece. Rational Data recruited and suggested candidates for us to select, screened the initial technical interviews, and then we gave the final approval after our own thorough check. The collaboration is ongoing, but so far, everything is going well.
RESULTS & FEEDBACK
What were the measurable outcomes from the project that demonstrate progress or success?
As mentioned, our collaboration is still ongoing, but we’ve been pleased with the quality of the work delivered by the engineer added to our team.
Describe their project management. Did they deliver items on time? How did they respond to your needs?
Yes, until now we haven’t had any issues with timing or responsiveness.
What was your primary form of communication with Rational Data?
Virtual Meeting
Email or Messaging App
What did you find most impressive or unique about this company?
Considering they’re a small company, we were quite impressed by the number of engineers they were able to reach. In just one month, they presented us with around 40 CVs.
Are there any areas for improvement or something Rational Data could have done differently?
No complaints so far.
RATINGS
5.0
Quality
5.0
Service & Deliverables
Schedule
5.0
On time / deadlines
Cost
5.0
Value / within estimates
Willing to Refer
5.0
NPS
Staff Augmentation & Software Development for Software Co
“The team members they assigned were very competent and highly professional.”
Feb 12, 2025
Managing Partner, Ideas Forward
Dimitrios Kourtesis
Verified
Other industries
Thessaloniki, Greece
11-50 Employees
Online Review
Verified
Rational Data provided two fractional developers who supported the development of an app for a software company. The team also developed a process for software quality management.
Rational Data’s resources had the right expertise. The team met the client's expectations and completed work efficiently. Rational Data's support allowed the client to complete the project on time and on budget. The team responded quickly to needs and communicated via email and in-person meetings.
The client submitted this review online.
BACKGROUND
Please describe your company and position.
I am the Managing Partner of Ideas Forward
Describe what your company does in a single sentence.
Ideas Forward is a venture builder supporting early-stage tech startups.
OPPORTUNITY / CHALLENGE
What specific goals or objectives did you hire Rational Data to accomplish?
We needed specialized, short-term expertise in software development for a startup project.
SOLUTION
How did you find Rational Data?
Referral
Word of mouth
Why did you select Rational Data over others?
Close to my geographic location
Great culture fit
Good value for cost
Referred to me
Other
How many teammates from Rational Data were assigned to this project?
2-5 Employees
Describe the scope of work in detail. Please include a summary of key deliverables.
Rational Data recruited and assigned two engineers (fractional) to join our team and support us in developing an app for a startup. Their role also included developing a process for software quality management. Since this was a team augmentation engagement, there were no fixed deliverables. The work was carried out based on our needs and direction to bring the project to completion.
RESULTS & FEEDBACK
What were the measurable outcomes from the project that demonstrate progress or success?
Rational Data provided the right people with the right expertise, allowing us to complete the project on time and within budget.
Describe their project management. Did they deliver items on time? How did they respond to your needs?
They responded quickly to our needs, providing engineers with the right expertise. The team members they assigned were very competent and highly professional.
What was your primary form of communication with Rational Data?
In-Person Meeting
Email or Messaging App
What did you find most impressive or unique about this company?
They met our expectations, delivered what we asked for, and got the job done efficiently. I can’t think of anything unique to highlight, this was a straightforward arrangement.
Are there any areas for improvement or something Rational Data could have done differently?
Nothing comes to mind!
RATINGS
5.0
"Very easy to work with."
Quality
5.0
Service & Deliverables
Schedule
5.0
On time / deadlines
Cost
5.0
Value / within estimates
Willing to Refer
5.0
NPS
"We have already recommended the company to others in our network.
Custom Software Development for Data & Mapping Services Firm
Custom Software DevelopmentDigital Engineering
Confidential
Nov. 2016 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0
"They deliver exactly as promised, on time and within budget."
Feb 12, 2025
Manager of EEU Product Partnerships, HERE Technologies
Vasilis Pagonis
Verified
Other industries
Netherlands
5,001-10,000 Employees
Online Review
Verified
Rational Data updated points of interest (POIs) in Greece for a data and mapping services firm to keep the client's maps as comprehensive and up-to-date as possible.
Rational Data's work has been internally validated, and the client is pleased with the results. The team is highly communicative and responsive, and internal stakeholders are impressed with the service provider's vast technical knowledge and proficiency.
The client submitted this review online.
BACKGROUND
Please describe your company and position.
I am the Manager EEU Product Partnerships of HERE Technologies
Describe what your company does in a single sentence.
HERE Technologies provides location data and mapping services for businesses, enabling navigation, geospatial analytics, and real-time location-based solutions.
OPPORTUNITY / CHALLENGE
What specific goals or objectives did you hire Rational Data to accomplish?
Update points of interest (POIs) in Greece
Build data collection & processing tools
Improve map data
SOLUTION
How did you find Rational Data?
Online Search
Why did you select Rational Data over others?
Close to my geographic location
Great culture fit
Good value for cost
Experience with our industry
How many teammates from Rational Data were assigned to this project?
2-5 Employees
Describe the scope of work in detail. Please include a summary of key deliverables.
Our main goal was to update and enrich Greece’s POIs, focusing on sectors such as restaurant hospitality, to keep HERE Maps as comprehensive and up to date as possible. This was achieved by building a suite of data collection and processing tools that accelerated field research.
RESULTS & FEEDBACK
What were the measurable outcomes from the project that demonstrate progress or success?
The number of updated POIs and the high quality of that data, which underwent thorough internal validation.
Describe their project management. Did they deliver items on time? How did they respond to your needs?
Rational Data delivered on time, were quick to answer our questions, and kept us in the loop with regular progress updates. We always had a direct line of communication, which helped make the process smooth and stress-free.
What was your primary form of communication with Rational Data?
In-Person Meeting
Virtual Meeting
Email or Messaging App
What did you find most impressive or unique about this company?
They deliver exactly as promised, on time and within budget. Their deep industry knowledge stood out, and their straightforward, no-nonsense approach made working with them easy and efficient.
Are there any areas for improvement or something Rational Data could have done differently?
Not that I can think of.
RATINGS
5.0
Quality
5.0
Service & Deliverables
Schedule
5.0
On time / deadlines
Cost
5.0
Value / within estimates
Willing to Refer
5.0
NPS
"fully recommended
Showing 1-3 of
3 Reviews
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