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Zachary C S
@probablypi
Vetted Pro
UK based mobile app and backend software developer
United Kingdom
English
Vetted by Fiverr Pro
Zachary C S was selected by the Fiverr Pro team for their expertise.
Vetted for
Mobile App Development
Mobile App Maintenance
About me
Probably Rational is a UK based mobile app and web design agency founded in 2016, we are based on the University of Lincoln campus in the Enterprise building known as Sparkhouse. We are a mix of graduates and current students studying computer science, our team has a wide range of skills from mobile development to back end services. Probably Rational focuses on bespoke development for clients, but also runs a small number of public services such as web hosting and SaSS products.
Skills
Zachary C S
$200/hour
Offline •
Average response time: 1 hour
See my services
Cross-Platform Development
I will build an android and ios mobile app
Cross-Platform Development
I will build a custom website application
Want to work on an hourly basis?
Tell Zachary C S what you need.
$200
/
hourPortfolio
Work experience
Found and Director
Probably Rational Ltd. • Self-employed
Jan 2016 - Apr 2025 • 9 yrs 3 mos
I founded this software consultancy during university and grew it over seven years into a thriving agency with nine employees. As both lead technical architect and business director, I managed the entire operation from client acquisition through to hands-on development and delivery. I built the company into a profitable operation serving an international client base. I grew the company from a university venture to a profitable 9-person agency while maintaining a reputation for high-quality full-stack development and fostering a collaborative team culture. I won multiple industry awards for the company over consecutive years, recognizing our technical excellence and business growth.
16 Reviews
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Rating Breakdown
- Seller communication level
- Recommend to a friend
- Service as described
1-5 out of 16 Reviews
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Most relevant
privatepins
United States
Working with any developer on a tight timeline is always subject to deadline pushbacks. We had our own in-house (so to speak) developer that couldnt deliver in 4 months, what they delivered in 4 weeks of actual build time. Not only were Zachary and Thomas very communicative and up front regarding our...
Seller's Response
Helpful?
hyphenit
United Kingdom
Great experience working with Thomas and Zachary - they delivered ahead of schedule and were proactive in seeking clarification when necessary. The questions they asked at the start of the process gave us confidence that they could deliver and we weren't disappointed. Rest assured that these guys really...
Helpful?
cpdme2014
United Kingdom
Zachary and Thomas have provided excellent support and communication throughout the development of our new mobile apps, including some modernisation of our front-end. We are pleased with the product and will continue to work with them in the future. Would definitely recommend.
Helpful?
ja7ye2ja
Repeat Client
Denmark
Zachary and his team did an amazing job. They delivered something that others gave up on. Even though we had some difficulties during the development, some missed timelines ect. i am fully satisfied with this work. Zachary underestimated the gig from the start, but newer once complained, he just kept...
Helpful?
1 person found this review helpful.
razafaizi
United States
While we had some hiccups that extended the delivery time, Zach was amazing to work with and made sure the final product was as promised!
Seller's Response
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