You will get full-stack application: design, development, deployment.
Top Rated
Project details
You will get a sophisticated, scalable application designed for high performance and extensive features. With my expertise, your large-scale app will be robust, user-friendly, and tailored to handle complex needs. I focus on delivering top-notch quality and performance, ensuring your app excels in every aspect."
Programming Languages
Java, TypeScriptCoding Expertise
PSD to HTML, Localization, Performance OptimizationWhat's included
| Service Tiers |
Starter
$5,000
|
Standard
$10,000
|
Advanced
$20,000
|
|---|---|---|---|
| Delivery Time | 30 days | 60 days | 60 days |
Number of Revisions | 1 | 2 | 4 |
Design Customization | |||
Content Upload | |||
Responsive Design | |||
Source Code |
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AT
Alfiya T.
Mar 23, 2026
JavaScript/Angular/React Developer for API Demos and Code Samples
Working with Oleg has been a very positive experience. He supported us across multiple areas, including library development, code samples, technical articles, and product maintenance, and consistently delivered high-quality results.
What stood out most was the combination of speed and reliability. Communication was always clear and efficient, and tasks were handled quickly without compromising quality. Thanks to his expertise, we were able to save a significant amount of time and accomplish more than expected.
He is highly responsible, easy to work with, and offers a great balance between cost and quality. Overall, a very reliable professional — I would definitely recommend working with him.
What stood out most was the combination of speed and reliability. Communication was always clear and efficient, and tasks were handled quickly without compromising quality. Thanks to his expertise, we were able to save a significant amount of time and accomplish more than expected.
He is highly responsible, easy to work with, and offers a great balance between cost and quality. Overall, a very reliable professional — I would definitely recommend working with him.
AC
Alexis C.
Jan 26, 2026
Lead Backend Developer
AC
Alexis C.
Jul 28, 2025
Lead Backend Developer
JC
Jack C.
Jul 4, 2025
Ongoing freelance Java Developer (Spring) - multiple projects
Excellent work. Efficient and really good quality! I would definitely work with Oleg again.
AC
Alexis C.
Feb 24, 2025
Senior Backend Developer
About Oleg
Senior Full-Stack Developer | AI & Fintech Specialist | Java, Angular
100%
Job Success
Yerevan, Armenia - 2:35 am local time
Specializing in 𝗔𝗻𝗴𝘂𝗹𝗮𝗿 (𝟭𝟴+), 𝗝𝗮𝘃𝗮 (𝟭𝟳+), 𝗦𝗽𝗿𝗶𝗻𝗴 𝗕𝗼𝗼𝘁, 𝗔𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻, 𝗔𝗣𝗜 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁, 𝗙𝗶𝗻𝘁𝗲𝗰𝗵, and Scalable Web Applications.
With 𝟭𝟬+ 𝘆𝗲𝗮𝗿𝘀 delivering robust, maintainable, and scalable software solutions, I combine front-end expertise in Angular and back-end mastery with 𝗝𝗮𝘃𝗮 𝗮𝗻𝗱 𝗦𝗽𝗿𝗶𝗻𝗴 𝗕𝗼𝗼𝘁 𝘄𝗶𝘁𝗵 𝗔𝗜 𝗶𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 𝘀𝗸𝗶𝗹𝗹𝘀 including 𝗚𝗣𝗧-𝟰, 𝗟𝗮𝗻𝗴𝗖𝗵𝗮𝗶𝗻, 𝗖𝘂𝗿𝘀𝗼𝗿 𝗔𝗜, 𝗣𝘆𝘁𝗵𝗼𝗻, 𝗮𝗻𝗱 𝗡𝗼𝗱𝗲.𝗷𝘀. I build powerful AI-driven automation, chatbots, and API workflows.
𝗪𝗵𝘆 𝘄𝗼𝗿𝗸 𝘄𝗶𝘁𝗵 𝗺𝗲?
✅ 𝗗𝗲𝗲𝗽 𝗲𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 𝗶𝗻 𝗔𝗻𝗴𝘂𝗹𝗮𝗿 & 𝗝𝗮𝘃𝗮 – clean, scalable code optimized for performance
✅ 𝗔𝗜 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 𝘀𝗸𝗶𝗹𝗹𝘀 – GPT-4, LangChain, Cursor AI, OpenAI API, Python, Node.js
✅ 𝗖𝗹𝗼𝘂𝗱 & 𝗗𝗲𝘃𝗢𝗽𝘀 – AWS, Kubernetes, Docker, CI/CD pipelines
✅ 𝗧𝗲𝘀𝘁𝗶𝗻𝗴 & 𝗤𝘂𝗮𝗹𝗶𝘁𝘆 𝗔𝘀𝘀𝘂𝗿𝗮𝗻𝗰𝗲 – unit & integration testing with Jest, JUnit, Selenium
✅ 𝗣𝗮𝘆𝗺𝗲𝗻𝘁 & 𝗔𝗣𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 – Stripe, Braintree, PayPal, Sendinblue, plus fintech platforms
✅ 𝗧𝗿𝘂𝘀𝘁𝗲𝗱 𝗯𝘆 𝘀𝘁𝗮𝗿𝘁𝘂𝗽𝘀 & 𝗲𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲𝘀 – 50+ projects delivered successfully
✅ 𝗙𝗮𝘀𝘁, 𝗰𝗹𝗲𝗮𝗿 𝗰𝗼𝗺𝗺𝘂𝗻𝗶𝗰𝗮𝘁𝗶𝗼𝗻 & 𝗿𝗲𝗹𝗶𝗮𝗯𝗹𝗲 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝘆 𝘁𝗼 𝗸𝗲𝗲𝗽 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 𝗼𝗻 𝘁𝗿𝗮𝗰𝗸
𝗖𝗿𝗲𝗱𝗲𝗻𝘁𝗶𝗮𝗹𝘀 & 𝗕𝗮𝗰𝗸𝗴𝗿𝗼𝘂𝗻𝗱
⭐ Oracle Certified Java Professional
⭐ Neural Networks and Deep Learning (DeepLearning.AI)
⭐ Lecturer at Russian-Armenian University (RAU)
⭐ Computer Science graduate, American University of Armenia
𝗖𝗹𝗶𝗲𝗻𝘁 𝗣𝗿𝗮𝗶𝘀𝗲:
"Oleg integrated GPT-4 APIs seamlessly, creating a chatbot that boosted our customer engagement by 40%." – AllAboutCustomers
"Delivered LangChain automation ahead of schedule, saving us thousands in manual work." – BobbyTech
🚀 Ready to build your next AI or fintech solution with a trusted expert?
Message me today and let’s create something amazing!
Steps for completing your project
After purchasing the project, send requirements so Oleg can start the project.
Delivery time starts when Oleg receives requirements from you.
Oleg works on your project following the steps below.
Revisions may occur after the delivery date.
End-to-end service: design, development, integration, testing, and support.
Managing every stage from detailed consultation and architecture design to scalable development, integration, and extensive testing, I deliver a high-performance large app with ongoing support.