Core Crystal Soft
Web and Mobile, Game and Chrome Extension Development with Java and Javascript (Flutter/React/Node.js)
If this is your agency
#18,791
of 28,921 agencies on Upwork by lifetime earnings, and #469 in .NET Development.
- #18,790A.S.K. (Architecture-Systems-Knowledge)$0 ahead
- #18,791Core Crystal Softthis agency
- #18,792Dudkin Development Solutions$0 behind
Total earned
$668
lifetime, as published
Jobs
3
contracts to date
Hours
16
billed hourly
Job Success
Not rated yet
not yet rated
Hourly rate
$10–$25/hr
team range
Index Score
36
#20308 overall
Insights
How these are computed- Run-rate, measured
- pending
- Needs two observations at least 14 days apart. Our next read of this page turns this on. Nothing is extrapolated from a single contract.
- Lifetime pace
- $110/yr estimate
- Lifetime earnings divided by years on Upwork. A floor on historical pace, not a forecast.
- Earnings per job
- $223
- Average contract value to date.
- Recent earnings, per Upwork
- $0
- The "recent" figure Upwork attaches to the directory card. Upwork does not publish the window, so it is shown as its number, not ours.
- Realised hourly
- n/a
- Total earned over billed hours. Fixed-price work inflates it; compare with the rate card.
Index Score breakdown35.6/100
Scale 16.1/40Quality 10/20Trust 0/15Momentum 3/15Team 6.5/10
Observation history
Every read of the public page. Last observed Oct 29, 2026 (live read).
| Observed | Earned | Δ | Jobs | JSS |
|---|---|---|---|---|
| Oct 29, 2026 | $668 | 3 | Not rated |
One observation so far. The index re-reads every page on a rolling schedule; claimed pages are read weekly.
About
Our motto in short: Our partner's happiness is also our happiness. To us, work is not only about providing technical solution for my clients, but also sharing knowledge and thus consulting the best choices for them. We focus on bringing the best out of people, so they can bring the best for others. Our staffs consists of enthusiastic and professional junior and senior engineers, who has experiences with a wide range of technologies. We have worked extensively with Java and JavaScript (Node.js) ecosystem. We are strong at consultancy, and optimization of product quality per project fund. Our expertise in summary: • Full-stack web/mobile applications with MERN. • Backend: Java and Node.Js * Frontend: React, Flutter * Mobile game: Unity or Cocos * Mobile apps: React Native, Flutter • Chrome extension: React, Wepack and Material-UI • Cloud: AWS, GCP We are active looking for long-term working relationships or partnerships so feel free to contact us here on UpWork.Read more
Skills
C#JavaMobile App DevelopmentRedisDashboardSpring Boot.NET FrameworkSQLGoogle Chrome ExtensionDatabaseWeb ApplicationApache KafkaNoSQL DatabaseNodeJS FrameworkPython
Agency facts
- Team size
- 11-50
- Teams on Upwork
- 1
- Founded
- Not published
- Member since
- Oct 2020
- Last contract
- Feb 2021
- Owner
- Toan N.
- Client focus
- Not published
- Members in
- Vietnam
- Languages
- Not published
Agencies in the same categories
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Core Crystal Soft is #18791 of 28,921 Upwork agencies. Post the card, or share the link and the card comes with it.
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#18791 overall
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#469 in .NET Development
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#1244 in Java
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#2628 in App Development
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#79 in Vietnam
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