KJONGSys

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Details

Founded:
2008
Hourly Rates:
Undisclosed
Employees:
Freelancer
Ratings:
4.4 9 Reviews

Industries Served

Energy & Utilities Financial Services Government & Public Sector Events & Event Management Human Resources Aerospace & Defense Nonprofit & NGO

Where We Specialize

24% Testing Services
Testing Services 24%
Big Data Analytics 21%
Mobile App Development 18%
Salesforce Development 14%
Bot Development 11%
Software Development 4%
AI Development 4%
Virtual Reality 4%

Industry Expertise

Hospitality43% Automotive25% Manufacturing22% Travel10%

Typical Project Size

45% Midmarket Business
37% Small Business
18% Enterprise

About

KJONGSys works with clients to plan, build, and ship digital products. The company's main offerings are Web Development. KJONGSys works solo as a freelance specialist. The team is based in Lakeland, FL. This profile is a starting point — reach out to KJONGSys directly to discuss project specifics.

KJONGSys Reviews

4.4 9 Reviews
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Strong Technical Skills and a Very Responsive Data & Analytics Team

Lukas Fischer / Director of IT | Sep 16, 2026

We were very happy with how this project went. 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.

The result looks great and performs well, and our internal team found it easy to take over. We are already discussing the next phase with them.

Project summary

We hired KJONGSys to set up a data warehouse and reporting layer for our leadership team. 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 4.0
  • Schedule 4.5
  • Project Cost 4.0
  • Willing To Refer 5.0
Project Type:
Data & Analytics
Project Cost:
$50,000 to $149,999
Project Duration:
Mar 2026 - Aug 2026
Business Type:
Energy & Utilities
Location:
Berlin, Germany

Questions & Answers

Please describe your company, your role, and the industry you operate in.
Evergreen Power GmbH is a Energy & Utilities business in Berlin, Germany. As Director of IT, I was responsible for this project on our side and the main contact for KJONGSys.
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 set up a data warehouse and reporting layer for our leadership team.
What services did the company provide for your project?
Mainly Data & Analytics. 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?
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?
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?
We can now handle more volume without adding staff, which was the main goal.
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've already recommended them to a couple of people I know.

Solid Mobile App Development Work With Clear Communication Throughout

Megan Sullivan / Senior Engineering Manager | Aug 21, 2026

We were happy with the final result. The team asked a lot of questions early on, which felt slow at first but meant there were very few surprises later. 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.

Feedback from our customers has been very positive so far. A couple of milestones slipped by a week or so, mostly around testing.

We are already discussing the next phase with them.

Project summary

Our company worked with KJONGSys to rebuild our existing mobile app, which had poor reviews and frequent crashes. They also took care of integrations with a couple of third-party tools we already used. Overall it was a 3-month engagement.

  • Overall Rating 4.0
  • Quality 4.0
  • Schedule 4.0
  • Project Cost 4.0
  • Willing To Refer 5.0
Project Type:
Mobile App Development
Project Cost:
$500,000+
Project Duration:
Apr 2026 - Jul 2026
Business Type:
Financial Services
Location:
Chicago, USA

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We're a mid-sized Financial Services company based in Chicago, 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 rebuild our existing mobile app, which had poor reviews and frequent crashes so they could focus on customers.
What services did the company provide for your project?
End-to-end Mobile App Development — from requirements and design through to deployment and a support period afterwards.
Why did you choose this company over other providers you considered?
We compared three or four agencies. KJONGSys asked the best questions and had good reviews from past clients.
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?
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?
We can now handle more volume without adding staff, which was the main goal.
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.

Professional Quality Assurance & Testing Team, Smooth Delivery From Start to Finish

Andre Carter / Head of Engineering | Aug 14, 2026

We were very happy with how this project went. 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 are already seeing better numbers than before the project.

We are already discussing the next phase with them.

Project summary

KJONGSys was brought in to take over manual and regression testing before each release. They also took care of integrations with a couple of third-party tools we already used. The engagement ran for about 2 months.

  • Overall Rating 4.5
  • Quality 4.5
  • Schedule 4.5
  • Project Cost 4.5
  • Willing To Refer 5.0
Project Type:
Quality Assurance & Testing
Project Cost:
$150,000 to $499,999
Project Duration:
May 2026 - Jul 2026
Business Type:
Government & Public Sector
Location:
Chicago, USA

Questions & Answers

Please describe your company, your role, and the industry you operate in.
I'm the Head of Engineering at Redwood Public Services, a Government & Public Sector company based in Chicago, 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 team was spending too much time on manual work. The goal was to take over manual and regression testing before each release so they could focus on customers.
What services did the company provide for your project?
End-to-end Quality Assurance & Testing — from requirements and design through to deployment and a support period afterwards.
Why did you choose this company over other providers you considered?
They had relevant experience in Government & Public Sector and their proposal was the clearest of the ones we received.
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?
Yes, on time and within budget.
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?
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 listened, asked the right questions, and delivered

Siddharth Mehta / Director of IT | May 31, 2026

Honestly, this was one of the smoothest projects we have run with an outside team. They shared working builds regularly, so we could test early and give feedback before things were locked in. Communication was consistent. We had a weekly call, a shared Slack channel and a project board we could check at any time.

Since launch, everything has been stable and our team has adapted to it quickly. I would recommend KJONGSys to anyone looking for a dependable Mobile App Development partner.

Project summary

KJONGSys was brought in to develop a field-staff app with offline mode that syncs back to our main system. They worked alongside our in-house team, which mostly handled business requirements and testing. Overall it was a 3-month engagement.

  • Overall Rating 5.0
  • Quality 5.0
  • Schedule 5.0
  • Project Cost 5.0
  • Willing To Refer 5.0
Project Type:
Mobile App Development
Project Cost:
$50,000 to $149,999
Project Duration:
Dec 2025 - Mar 2026
Business Type:
Events & Event Management
Location:
Jaipur, India

Questions & Answers

Please describe your company, your role, and the industry you operate in.
Ironwood Experiences is a Events & Event Management business in Jaipur, India. As Director of IT, I was responsible for this project on our side and the main contact for KJONGSys.
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 field-staff app with offline mode that syncs back to our main system so they could focus on customers.
What services did the company provide for your project?
Mainly Mobile App 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?
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?
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?
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?
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 would recommend them and we plan to work with them again.

Easy to work with and very transparent on timelines and cost

Amy Wright / Program Manager | May 09, 2026

KJONGSys did good work for us, and we would use them again. 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. Even with the time zone difference, responses usually came the same day and we never felt left in the dark.

Feedback from our customers has been very positive so far. There were some early misunderstandings on requirements that took a few rounds to sort out. If you need a team that communicates well and delivers, they are a good choice.

Project summary

We partnered with KJONGSys to set up automated testing for our web application. They worked alongside our in-house team, which mostly handled business requirements and testing. The project took roughly 4 months from kickoff to launch.

  • Overall Rating 4.0
  • Quality 4.0
  • Schedule 4.0
  • Project Cost 4.0
  • Willing To Refer 5.0
Project Type:
Quality Assurance & Testing
Project Cost:
$50,000 to $149,999
Project Duration:
Dec 2025 - Apr 2026
Business Type:
Human Resources
Location:
London, UK

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We're a mid-sized Human Resources company based in London, 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 existing setup was holding us back. We wanted to set up automated testing for our web application before our busy season.
What services did the company provide for your project?
Mainly Quality Assurance & Testing. 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?
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?
They understood our goals quickly, partly because they had worked with Human Resources clients before.
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?
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.

Great Experience With KJONGSys on Our Software Development Project

Sam Barker / Owner | Apr 17, 2026

Our experience with KJONGSys was really positive from start to finish. Communication was consistent. We had a weekly call, a shared Slack channel and a project board we could check at any time. 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 launched on schedule and have not had any major issues since. Overall, a team we trust and plan to keep working with.

Project summary

We hired KJONGSys 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. We worked together for around 9 months.

  • Overall Rating 4.5
  • Quality 4.5
  • Schedule 4.5
  • Project Cost 4.5
  • Willing To Refer 5.0
Project Type:
Software Development
Project Cost:
$10,000 to $49,999
Project Duration:
May 2025 - Feb 2026
Business Type:
Aerospace & Defense
Location:
Reading, UK

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We're a mid-sized Aerospace & Defense company based in Reading, UK. I'm the Owner 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?
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?
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?
Yes, on time and within budget.
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?
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.

Great team to work with — professional, responsive and reliable

Kelly Wallace / Project Manager | Feb 22, 2026

I would rate this engagement highly on almost every front. They shared working builds regularly, so we could test early and give feedback before things were locked in. Communication was consistent. We had a weekly call, a shared Slack channel and a project board we could check at any time.

The Quality Assurance & Testing work has already made a noticeable difference — tasks that used to take hours now take minutes. Overall, a team we trust and plan to keep working with.

Project summary

KJONGSys was brought in to run performance and load testing ahead of a big launch. They also took care of integrations with a couple of third-party tools we already used. The project took roughly 6 months from kickoff to launch.

  • Overall Rating 4.5
  • Quality 4.5
  • Schedule 4.0
  • Project Cost 5.0
  • Willing To Refer 5.0
Project Type:
Quality Assurance & Testing
Project Cost:
$150,000 to $499,999
Project Duration:
Jul 2025 - Jan 2026
Business Type:
Nonprofit & NGO
Location:
Phoenix, USA

Questions & Answers

Please describe your company, your role, and the industry you operate in.
I'm the Project Manager at Clearfield Community Network Inc, a Nonprofit & NGO company based in Phoenix, 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 team was spending too much time on manual work. The goal was to run performance and load testing ahead of a big launch so they could focus on customers.
What services did the company provide for your project?
Mainly Quality Assurance & Testing. 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?
They had relevant experience in Nonprofit & NGO 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?
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?
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?
We can now handle more volume without adding staff, which was the main goal.
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.

Quality work, a little slower than we planned

Amanda Hughes / Director | Jan 15, 2026

The final product works well for us, although the process could have been smoother. Even with the time zone difference, responses usually came the same day and we never felt left in the dark. They were upfront about what was realistic within our budget, which helped us prioritise the right features.

The CRM Development work has already made a noticeable difference — tasks that used to take hours now take minutes. Their team changed one developer midway, which slowed things down for a couple of weeks. If you need a team that communicates well and delivers, they are a good choice.

Project summary

We hired KJONGSys to customize our CRM and connect it to our website and billing system. The work covered requirements, design, development, testing and launch support. We worked together for around 9 months.

  • Overall Rating 3.5
  • Quality 3.5
  • Schedule 3.5
  • Project Cost 3.5
  • Willing To Refer 5.0
Project Type:
CRM Development
Project Cost:
$10,000 to $49,999
Project Duration:
Apr 2025 - Jan 2026
Business Type:
Events & Event Management
Location:
San Jose, USA

Questions & Answers

Please describe your company, your role, and the industry you operate in.
I work as Director at Trueline Live. We operate in Events & Event Management and most of our customers are in and around San Jose, USA.
What specific problem or business challenge led you to hire this company?
We needed to customize our CRM and connect it to our website and billing system, and we didn't have the in-house capacity to do it ourselves.
What services did the company provide for your project?
Mainly CRM 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?
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?
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?
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.

A reliable long-term partner for our tech needs

Owen Leblanc / Chief Digital Officer | Jan 08, 2026

I would rate this engagement highly on almost every front. They shared working builds regularly, so we could test early and give feedback before things were locked in. 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. Communication was consistent. We had a weekly call, a shared Slack channel and a project board we could check at any time.

We launched on schedule and have not had any major issues since.

Happy to recommend them.

Project summary

We partnered with KJONGSys to develop a field-staff app with offline mode that syncs back to our main system. They also took care of integrations with a couple of third-party tools we already used. The engagement ran for about 4 months.

  • Overall Rating 5.0
  • Quality 5.0
  • Schedule 5.0
  • Project Cost 5.0
  • Willing To Refer 5.0
Project Type:
Mobile App Development
Project Cost:
$500,000+
Project Duration:
Aug 2025 - Dec 2025
Business Type:
Government & Public Sector
Location:
Montreal, Canada

Questions & Answers

Please describe your company, your role, and the industry you operate in.
Summit Civic Solutions is a Government & Public Sector business in Montreal, Canada. As Chief Digital Officer, I was responsible for this project on our side and the main contact for KJONGSys.
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 field-staff app with offline mode that syncs back to our main system so they could focus on customers.
What services did the company provide for your project?
Mainly Mobile App 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?
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?
They understood our goals quickly, partly because they had worked with Government & Public Sector clients before.
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?
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. They are a reliable Mobile App Development partner.
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