THEY.dev

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Details

Founded:
2017
Hourly Rates:
$25 - $49 / hr
Employees:
10 - 49
Ratings:
4.5 9 Reviews

Industries Served

Insurance Construction Automotive Gaming & Gambling Aerospace & Defense Legal Services Manufacturing Healthcare

Where We Specialize

15% Mobile App Development
Mobile App Development 15%
Cloud Computing Services 14%
Software Development 13%
IoT Development 12%
Salesforce Development 10%
Web Design 10%
Virtual Reality 8%
UI/UX 8%
Bot Development 6%
Web Development 2%
Testing Services 2%

Industry Expertise

Sports75% Fitness25%

Typical Project Size

70% Midmarket Business
17% Small Business
13% Enterprise

About

Since 2017, THEY.dev has operated as a technology services provider. THEY.dev focuses on Mobile App Development. With 10 - 49 people on staff, THEY.dev can take on projects of varying size. Typical hourly rates run around $25 - $49 / hr/hr. THEY.dev holds a 5.0-star rating across 31 client reviews. THEY.dev operates out of London, England. Overall, THEY.dev is one of the options worth shortlisting for a technology project.

THEY.dev Reviews

4.5 9 Reviews
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A reliable long-term partner for our tech needs

Laura Koch / Marketing Director | Oct 05, 2026

We were very happy with how this project went. The team asked a lot of questions early on, which felt slow at first but meant there were very few surprises later. When we changed our minds on a couple of features halfway through, they handled it without fuss and were clear about the impact on cost and timeline.

We are already seeing better numbers than before the project.

If you need a team that communicates well and delivers, they are a good choice.

Project summary

We engaged THEY.dev to connect our equipment to a cloud dashboard so we could monitor it remotely. Scope included discovery workshops, development in two-week sprints and a short support period after launch. Overall it was a 2-month engagement.

  • Overall Rating 5.0
  • Quality 5.0
  • Schedule 5.0
  • Project Cost 5.0
  • Willing To Refer 5.0
Project Type:
IoT Development
Project Cost:
$150,000 to $499,999
Project Duration:
Jun 2026 - Aug 2026
Business Type:
Insurance
Location:
Frankfurt, Germany

Questions & Answers

Please describe your company, your role, and the industry you operate in.
Evergreen Underwriters GmbH is a Insurance business in Frankfurt, Germany. As Marketing Director, I was responsible for this project on our side and the main contact for THEY.dev.
What specific problem or business challenge led you to hire this company?
Our existing setup was holding us back. We wanted to connect our equipment to a cloud dashboard so we could monitor it remotely before our busy season.
What services did the company provide for your project?
End-to-end IoT Development — from requirements and design through to deployment and a support period afterwards.
Why did you choose this company over other providers you considered?
A colleague recommended them, and our first calls confirmed they understood what we needed.
How clearly did the company understand your requirements and business goals?
Well. There were a couple of points we had to clarify early on, but after that they were spot on.
How was your overall experience with their communication and project management?
Good. Weekly calls, regular updates and a shared board meant we always knew where things stood.
Did the company deliver the project on time and within your expected budget?
Yes. The only extra cost came from features we added ourselves, and they quoted those fairly.
What tangible results or business impact have you seen since the project was completed?
We can now handle more volume without adding staff, which was the main goal.
What did you like most about working with this company?
That they were proactive — they suggested improvements instead of just doing what was asked.
Would you recommend this company to others, and would you work with them again?
Definitely. We have already started talking about the next phase.

THEY.dev Delivered a Quality UI/UX Design Solution on Time

Georgia Taylor / General Manager | Sep 18, 2026

Honestly, this was one of the smoothest projects we have run with an outside team. The developers were knowledgeable and made a few suggestions that ended up saving us time and money. They shared working builds regularly, so we could test early and give feedback before things were locked in.

Since launch, everything has been stable and our team has adapted to it quickly.

We are already discussing the next phase with them.

Project summary

We engaged THEY.dev to run user research and create new designs for our mobile app. They also took care of integrations with a couple of third-party tools we already used. The engagement ran for about 5 months.

  • Overall Rating 5.0
  • Quality 5.0
  • Schedule 5.0
  • Project Cost 5.0
  • Willing To Refer 5.0
Project Type:
UI/UX Design
Project Cost:
$50,000 to $149,999
Project Duration:
Apr 2026 - Sep 2026
Business Type:
Construction
Location:
Gold Coast, Australia

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We're a mid-sized Construction company based in Gold Coast, Australia. I'm the General Manager and I oversaw the project from start to finish.
What specific problem or business challenge led you to hire this company?
Our existing setup was holding us back. We wanted to run user research and create new designs for our mobile app before our busy season.
What services did the company provide for your project?
UI/UX Design, including planning, development, testing and launch support.
Why did you choose this company over other providers you considered?
A colleague recommended them, and our first calls confirmed they understood what we needed.
How clearly did the company understand your requirements and business goals?
Better than we expected. They pointed out a few things we had not thought about.
How was your overall experience with their communication and project management?
Organised and transparent. Their project manager kept the project on track and flagged risks early.
Did the company deliver the project on time and within your expected budget?
Mostly. One milestone slipped by about a week, but the final delivery was on schedule and the budget held.
What tangible results or business impact have you seen since the project was completed?
It is still early, but the numbers are trending in the right direction and the system has been stable.
What did you like most about working with this company?
Their attention to detail and the quality of the final product.
Would you recommend this company to others, and would you work with them again?
Definitely. We have already started talking about the next phase.

Good results, communication improved as the project went on

Andre Coleman / Senior Engineering Manager | Aug 11, 2026

Overall the project was a success, though it was not without some challenges. They took the time to understand our business before suggesting anything, which we appreciated after previous agencies jumped straight into building. When we changed our minds on a couple of features halfway through, they handled it without fuss and were clear about the impact on cost and timeline.

Since launch, everything has been stable and our team has adapted to it quickly. We had to follow up a few times on smaller bug fixes after launch. We are already discussing the next phase with them.

Project summary

We partnered with THEY.dev to redesign the user experience of our SaaS product. They also took care of integrations with a couple of third-party tools we already used. We worked together for around 7 months.

  • Overall Rating 3.5
  • Quality 3.5
  • Schedule 4.0
  • Project Cost 3.5
  • Willing To Refer 5.0
Project Type:
UI/UX Design
Project Cost:
$50,000 to $149,999
Project Duration:
Dec 2025 - Jul 2026
Business Type:
Automotive
Location:
Minneapolis, USA

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We're a mid-sized Automotive company based in Minneapolis, USA. I'm the Senior Engineering Manager and I oversaw the project from start to finish.
What specific problem or business challenge led you to hire this company?
Our team was spending too much time on manual work. The goal was to redesign the user experience of our SaaS product so they could focus on customers.
What services did the company provide for your project?
Mainly UI/UX Design. They also helped with the technical planning and a few integrations with our existing tools.
Why did you choose this company over other providers you considered?
A colleague recommended them, and our first calls confirmed they understood what we needed.
How clearly did the company understand your requirements and business goals?
Well. There were a couple of points we had to clarify early on, but after that they were spot on.
How was your overall experience with their communication and project management?
Very responsive. We usually heard back the same day, even with the time difference.
Did the company deliver the project on time and within your expected budget?
Mostly. One milestone slipped by about a week, but the final delivery was on schedule and the budget held.
What tangible results or business impact have you seen since the project was completed?
It is still early, but the numbers are trending in the right direction and the system has been stable.
What did you like most about working with this company?
The consistency. Same team, same standard, from the first week to the last.
Would you recommend this company to others, and would you work with them again?
Definitely. We have already started talking about the next phase.

Professional Software Development Team, Smooth Delivery From Start to Finish

Tom Lloyd / Program Manager | Jul 07, 2026

I would rate this engagement highly on almost every front. Even with the time zone difference, responses usually came the same day and we never felt left in the dark. The developers were knowledgeable and made a few suggestions that ended up saving us time and money. They were upfront about what was realistic within our budget, which helped us prioritise the right features.

We launched on schedule and have not had any major issues since. I would recommend THEY.dev to anyone looking for a dependable Software Development partner.

Project summary

We hired THEY.dev to develop a scheduling and dispatch tool for our field team. Scope included discovery workshops, development in two-week sprints and a short support period after launch. Overall it was a 4-month engagement.

  • Overall Rating 4.5
  • Quality 4.5
  • Schedule 5.0
  • Project Cost 5.0
  • Willing To Refer 5.0
Project Type:
Software Development
Project Cost:
$500,000+
Project Duration:
Feb 2026 - Jun 2026
Business Type:
Gaming & Gambling
Location:
Birmingham, UK

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We're a mid-sized Gaming & Gambling company based in Birmingham, UK. I'm the Program Manager and I oversaw the project from start to finish.
What specific problem or business challenge led you to hire this company?
Our team was spending too much time on manual work. The goal was to develop a scheduling and dispatch tool for our field team so they could focus on customers.
What services did the company provide for your project?
Mainly Software Development. They also helped with the technical planning and a few integrations with our existing tools.
Why did you choose this company over other providers you considered?
We compared three or four agencies. THEY.dev asked the best questions and had good reviews from past clients.
How clearly did the company understand your requirements and business goals?
Better than we expected. They pointed out a few things we had not thought about.
How was your overall experience with their communication and project management?
Good. Weekly calls, regular updates and a shared board meant we always knew where things stood.
Did the company deliver the project on time and within your expected budget?
Yes, on time and within budget.
What tangible results or business impact have you seen since the project was completed?
Our team saves several hours a week, and we have had very few issues since launch.
What did you like most about working with this company?
That they were proactive — they suggested improvements instead of just doing what was asked.
Would you recommend this company to others, and would you work with them again?
Yes, I've already recommended them to a couple of people I know.

Would happily work with them again

Arjun Menon / Founder & CEO | Jun 28, 2026

Our experience with THEY.dev was really positive from start to finish. The developers were knowledgeable and made a few suggestions that ended up saving us time and money. Their project manager kept things organised and was quick to flag anything that might affect the timeline.

It has made a real difference to how our team works day to day.

I would recommend THEY.dev to anyone looking for a dependable UI/UX Design partner.

Project summary

We engaged THEY.dev to run user research and create new designs for our mobile app. Their team handled planning, development and QA, with our product owner signing off each milestone. We worked together for around 6 months.

  • Overall Rating 4.5
  • Quality 4.5
  • Schedule 4.5
  • Project Cost 4.5
  • Willing To Refer 5.0
Project Type:
UI/UX Design
Project Cost:
$10,000 to $49,999
Project Duration:
Dec 2025 - May 2026
Business Type:
Aerospace & Defense
Location:
Hyderabad, India

Questions & Answers

Please describe your company, your role, and the industry you operate in.
Evergreen Defense Systems Pvt Ltd is a Aerospace & Defense business in Hyderabad, India. As Founder & CEO, I was responsible for this project on our side and the main contact for THEY.dev.
What specific problem or business challenge led you to hire this company?
We had tried to do this internally and it stalled. We needed specialists to run user research and create new designs for our mobile app.
What services did the company provide for your project?
UI/UX Design, plus QA and some consulting on how to structure the project.
Why did you choose this company over other providers you considered?
Their pricing was fair and they were honest about timelines instead of just telling us what we wanted to hear.
How clearly did the company understand your requirements and business goals?
Very well. They asked a lot of questions upfront and turned our rough ideas into a clear plan.
How was your overall experience with their communication and project management?
Very responsive. We usually heard back the same day, even with the time difference.
Did the company deliver the project on time and within your expected budget?
Yes. The only extra cost came from features we added ourselves, and they quoted those fairly.
What tangible results or business impact have you seen since the project was completed?
Our team saves several hours a week, and we have had very few issues since launch.
What did you like most about working with this company?
That they were proactive — they suggested improvements instead of just doing what was asked.
Would you recommend this company to others, and would you work with them again?
Yes. They are a reliable UI/UX Design partner.

Dependable CRM Development Partner for a Growing Automotive Business

Wei Jie Goh / Co-Founder | May 25, 2026

Honestly, this was one of the smoothest projects we have run with an outside team. The developers were knowledgeable and made a few suggestions that ended up saving us time and money. They took the time to understand our business before suggesting anything, which we appreciated after previous agencies jumped straight into building. We dealt with the same core team throughout, so we did not have to keep re-explaining things.

Since launch, everything has been stable and our team has adapted to it quickly. If you need a team that communicates well and delivers, they are a good choice.

Project summary

THEY.dev was brought in to customize our CRM and connect it to our website and billing system. The project was split into milestones, with a working build shared at the end of each one. The engagement ran for about 7 months.

  • Overall Rating 4.5
  • Quality 4.5
  • Schedule 5.0
  • Project Cost 4.5
  • Willing To Refer 5.0
Project Type:
CRM Development
Project Cost:
$10,000 to $49,999
Project Duration:
Sep 2025 - Apr 2026
Business Type:
Automotive
Location:
Singapore

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We're a mid-sized Automotive company based in Singapore. I'm the Co-Founder and I oversaw the project from start to finish.
What specific problem or business challenge led you to hire this company?
Our existing setup was holding us back. We wanted to customize our CRM and connect it to our website and billing system before our busy season.
What services did the company provide for your project?
End-to-end CRM Development — from requirements and design through to deployment and a support period afterwards.
Why did you choose this company over other providers you considered?
Their pricing was fair and they were honest about timelines instead of just telling us what we wanted to hear.
How clearly did the company understand your requirements and business goals?
Very well. They asked a lot of questions upfront and turned our rough ideas into a clear plan.
How was your overall experience with their communication and project management?
Very responsive. We usually heard back the same day, even with the time difference.
Did the company deliver the project on time and within your expected budget?
It was delivered on time, and the final invoice matched the original estimate.
What tangible results or business impact have you seen since the project was completed?
Customer feedback has been positive, and we have seen better engagement since going live.
What did you like most about working with this company?
How easy they were to work with. They were responsive, honest and genuinely interested in our success.
Would you recommend this company to others, and would you work with them again?
Yes, I would recommend them and we plan to work with them again.

THEY.dev Delivered a Quality Software Development Solution on Time

Brandon Henderson / Senior Product Manager | Mar 06, 2026

Our experience with THEY.dev was really positive from start to finish. Their project manager kept things organised and was quick to flag anything that might affect the timeline. They were upfront about what was realistic within our budget, which helped us prioritise the right features.

The Software Development work has already made a noticeable difference — tasks that used to take hours now take minutes. We would definitely work with them again.

Project summary

We partnered with THEY.dev to build a custom operations platform to replace the spreadsheets and email threads we were running the business on. The project was split into milestones, with a working build shared at the end of each one. Overall it was a 5-month engagement.

  • Overall Rating 4.5
  • Quality 5.0
  • Schedule 5.0
  • Project Cost 5.0
  • Willing To Refer 5.0
Project Type:
Software Development
Project Cost:
$50,000 to $149,999
Project Duration:
Aug 2025 - Jan 2026
Business Type:
Legal Services
Location:
San Diego, USA

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We're a mid-sized Legal Services company based in San Diego, USA. I'm the Senior Product Manager and I oversaw the project from start to finish.
What specific problem or business challenge led you to hire this company?
We needed to build a custom operations platform to replace the spreadsheets and email threads we were running the business on, and we didn't have the in-house capacity to do it ourselves.
What services did the company provide for your project?
Software Development, including planning, development, testing and launch support.
Why did you choose this company over other providers you considered?
We compared three or four agencies. THEY.dev asked the best questions and had good reviews from past clients.
How clearly did the company understand your requirements and business goals?
Better than we expected. They pointed out a few things we had not thought about.
How was your overall experience with their communication and project management?
Very responsive. We usually heard back the same day, even with the time difference.
Did the company deliver the project on time and within your expected budget?
Mostly. One milestone slipped by about a week, but the final delivery was on schedule and the budget held.
What tangible results or business impact have you seen since the project was completed?
Our team saves several hours a week, and we have had very few issues since launch.
What did you like most about working with this company?
Their attention to detail and the quality of the final product.
Would you recommend this company to others, and would you work with them again?
Yes, I've already recommended them to a couple of people I know.

They listened, asked the right questions, and delivered

Jessica Johnson / Head of Engineering | Jan 24, 2026

Honestly, this was one of the smoothest projects we have run with an outside team. Communication was consistent. We had a weekly call, a shared Slack channel and a project board we could check at any time. They took the time to understand our business before suggesting anything, which we appreciated after previous agencies jumped straight into building.

It has made a real difference to how our team works day to day.

Happy to recommend them.

Project summary

We partnered with THEY.dev to migrate our sales team to a new CRM and set up automation. They also took care of integrations with a couple of third-party tools we already used. The project took roughly 5 months from kickoff to launch.

  • Overall Rating 4.5
  • Quality 5.0
  • Schedule 4.5
  • Project Cost 4.5
  • Willing To Refer 5.0
Project Type:
CRM Development
Project Cost:
$150,000 to $499,999
Project Duration:
Jul 2025 - Dec 2025
Business Type:
Manufacturing
Location:
San Diego, USA

Questions & Answers

Please describe your company, your role, and the industry you operate in.
I'm the Head of Engineering at Ironwood Fabrication, a Manufacturing company based in San Diego, USA. I look after our technology and work closely with outside partners on bigger projects.
What specific problem or business challenge led you to hire this company?
Our existing setup was holding us back. We wanted to migrate our sales team to a new CRM and set up automation before our busy season.
What services did the company provide for your project?
CRM Development, plus QA and some consulting on how to structure the project.
Why did you choose this company over other providers you considered?
A colleague recommended them, and our first calls confirmed they understood what we needed.
How clearly did the company understand your requirements and business goals?
Well. There were a couple of points we had to clarify early on, but after that they were spot on.
How was your overall experience with their communication and project management?
Communication was good overall and improved further once we settled into a routine.
Did the company deliver the project on time and within your expected budget?
Yes, on time and within budget.
What tangible results or business impact have you seen since the project was completed?
It is still early, but the numbers are trending in the right direction and the system has been stable.
What did you like most about working with this company?
The consistency. Same team, same standard, from the first week to the last.
Would you recommend this company to others, and would you work with them again?
Definitely. We have already started talking about the next phase.

THEY.dev Delivered a Quality Cloud Services Solution on Time

Callum Hughes / Founder | Jan 06, 2026

Honestly, this was one of the smoothest projects we have run with an outside team. The team asked a lot of questions early on, which felt slow at first but meant there were very few surprises later. We dealt with the same core team throughout, so we did not have to keep re-explaining things.

We launched on schedule and have not had any major issues since. If you need a team that communicates well and delivers, they are a good choice.

Project summary

We partnered with THEY.dev to move our application to Azure and set up proper backups and monitoring. The project was split into milestones, with a working build shared at the end of each one. Overall it was a 6-month engagement.

  • Overall Rating 4.5
  • Quality 4.0
  • Schedule 4.5
  • Project Cost 4.0
  • Willing To Refer 5.0
Project Type:
Cloud Services
Project Cost:
$10,000 to $49,999
Project Duration:
Apr 2025 - Oct 2025
Business Type:
Healthcare
Location:
London, UK

Questions & Answers

Please describe your company, your role, and the industry you operate in.
I work as Founder at Greenfield Care. We operate in Healthcare and most of our customers are in and around London, UK.
What specific problem or business challenge led you to hire this company?
We needed to move our application to Azure and set up proper backups and monitoring, and we didn't have the in-house capacity to do it ourselves.
What services did the company provide for your project?
Cloud Services, including planning, development, testing and launch support.
Why did you choose this company over other providers you considered?
They had relevant experience in Healthcare and their proposal was the clearest of the ones we received.
How clearly did the company understand your requirements and business goals?
Very well. They asked a lot of questions upfront and turned our rough ideas into a clear plan.
How was your overall experience with their communication and project management?
Good. Weekly calls, regular updates and a shared board meant we always knew where things stood.
Did the company deliver the project on time and within your expected budget?
Mostly. One milestone slipped by about a week, but the final delivery was on schedule and the budget held.
What tangible results or business impact have you seen since the project was completed?
Our team saves several hours a week, and we have had very few issues since launch.
What did you like most about working with this company?
How easy they were to work with. They were responsive, honest and genuinely interested in our success.
Would you recommend this company to others, and would you work with them again?
Definitely. We have already started talking about the next phase.
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