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Stanislav S.
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Stanislav S.

Lead Back-End Engineer | Java + Spring | Code investor-ready products

Lead Back-End Engineer | Java + Spring | Building scalable, secure, and investor-ready products For 9+ years, I’ve been helping startups and growing businesses build reliable, fast, and maintainable back-ends that actually support scale — not just run. 💡 What you get working with me: Architecture that lasts: I design solutions that stay clean and efficient even as your product grows. Speed and clarity: Delivering results fast — with clear documentation and full transparency. Cross-domain expertise: Healthcare, E-Commerce, IoT, CRM, E-Learning. I understand business logic, not just code. AI & ML integration: GPT-based and ML-driven systems for smarter automation. Tech stack: Java, Spring (Boot, Security, Data, Batch), Hibernate, PostgreSQL, MongoDB, Redis, Elasticsearch, RabbitMQ, Docker, Jenkins, Linux, GitLab CI/CD. ✅ Bonus: I write clean, test-covered code (JUnit, Selenium) and handle deployment — from staging to production. Let’s turn your concept into a fast, stable, and scalable system. 📩 Message me to discuss your current challenge — I’ll help you find the smartest solution.

🇺🇦Smila, Ukraine$55/hr100% JSS5.00 (6)Since Feb 2021
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Earnings and projects

MRR
$9.8k

Last 6 months ÷ 6

World#1,374 / 412k
🇺🇦Country#86 / 14.3k
Revenue, last 30 days
$8.1k

Last 6 months: $59k

World#2,278 / 412k
🇺🇦Country#147 / 14.3k
Total earnings
$227k

Billed in all: $242k

World#12,504 / 412k
🇺🇦Country#1,014 / 14.3k
Per project
$23k

$29k in the last 6 months

World#4,833 / 412k
🇺🇦Country#419 / 14.3k
Projects, last 6 months
2
0% fixed100% hourly
World#88,918 / 412k
🇺🇦Country#3,419 / 14.3k
Projects in all
10

Across 11 contracts

0% fixed100% hourly
World#201,797 / 412k
🇺🇦Country#8,145 / 14.3k

Earnings, last 30 days

$242k+$8.1k earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$230k$235k$240k$245kOct 8Oct 23Nov 7

Skill rankings: #1 in 1 skill of 10

Rarest: top 0.46% in MySQL, of 14,471. Ranked by MRR among everyone on Upwork with the skill.

  1. 1Business Logic Layer51 freelancers · 🇺🇦 #1Top 2%
  2. 3Requirements Specification246 freelancers · 🇺🇦 #1Top 1%
  3. 3Automated Deployment Pipeline197 freelancers · 🇺🇦 #1Top 2%
  4. #5Hibernate677 freelancers · 🇺🇦 #2Top 0.74%
  5. #12Spring Framework880 freelancers · 🇺🇦 #3Top 1%
  6. #24CI/CD3,691 freelancers · 🇺🇦 #2Top 0.65%
  7. #54MongoDB10,865 freelancers · 🇺🇦 #10Top 0.50%
  8. #63API7,943 freelancers · 🇺🇦 #8Top 0.79%