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Volodymyr – Spring, Java, PostgreSQL, experts in Lemon.io

Volodymyr

From Ukraine (GMT+2)

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Back-end Web DeveloperSenior
Full-stack Web DeveloperSenior
Front-end Web DeveloperJunior-to-middle
Hire developer
12 years of commercial experience
AI
Banking
Blockchain
Cybersecurity
E-learning
Food and beverages
Information services
Logistics
Social media
Transportation
Addons
Chatbots
Communication tools
Embedded software
LMS
SaaS
Lemon.io stats
1
projects done
78
hours worked
1
offers now 🔥

Volodymyr – Spring, Java, PostgreSQL

Volodymyr is a Senior Software Developer with over 8 years of experience in Java. He specializes in creating well-structured and modern applications and has a strong background in microservice architecture and team leadership. Volodymyr has applied his skills across various domains, including banking, logistics, and healthcare.

Main technologies
Spring
1 year
Java
8 years
Additional skills
PostgreSQL
REST API
MongoDB
AWS
MySQL
Jenkins
Microsoft SQL Server
Maven
Project Lombok
ActiveMQ
Firebase
Docker
jQuery
Require.js
Hibernate
React
Angular
D3.js
SOAP
SQLite
Ready to start
08.07.2024
Direct hire
Potentially possible

Experience Highlights

Adobe Extension Developer
Jun 2024 - Jun 2024
Project Overview

Plugin for syncing illustrator images and online store product cards (in admin panel).

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Responsibilities:
  • Implemented login functionality, fetch collections, back-end fetch products, and views
  • Synced illustrator artboards with backend data
Project Tech stack:
React
Yarn
Material UI
REST API
Full-Stack Developer
Mar 2023 - May 20241 year 1 month
Project Overview

A chatbot based on AI which replies to clients requests on e-commerce websites.

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Responsibilities:
  • Integrated with Open AI API
  • Setup Spring boot, Spring security
  • Developed REST API, admin panel
  • Converted Figma to React
  • Deployed front-end and back-end
Project Tech stack:
React
Java
Spring Boot
REST API
MySQL
OpenAI
OpenAI API
Full-Stack Developer
Feb 2024 - May 20242 months
Project Overview

This is a crypto gaming platform which hosts multiple simple games like random dice. Users can bid and win using crypto.

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Responsibilities:
  • Setup back-end
  • Integrated with Solana crypto network
  • Implemented SOL top-up, withdrawal flows
  • Implemented virtual crypto wallets
  • Developed front-end: login, signup, top, withdraw flows, game start, game finish, win flow, etc
  • Deployed to AWS
Project Tech stack:
React
Spring Boot
Solana
Blockchain
PostgreSQL
AWS
Full-Stack Developer
Jun 2023 - Feb 20248 months
Project Overview

A software architecture modeling tool which does security vulnerability analysis and recommendations.

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Responsibilities:
  • Сreated a frontend for modeling software architecture
  • Created a module for the analysis of software architecture
  • Developed reporting
Project Tech stack:
React
Java
Spring Boot
AWS
REST API
MySQL
Senior Java Developer / Team Lead
Feb 2022 - Feb 20231 year
Project Overview

The service connects cities for everyone in a sustainable, smart, and fun way.

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Responsibilities:
  • Created microservices for renting a vehicle
  • Calculated a price-based trip duration
  • Implemented authentication
  • Estimated tasks
  • Set up a code review process
  • Managed team
Project Tech stack:
Spring Boot
Docker
Amazon ECS
REST API
JUnit
Mockito
Maven
Microservices
CQRS
React
Java
Spring
AWS
AWS CodeBuild
Apache Kafka
WebSocket
Java Team Lead
Jun 2021 - Dec 20216 months
Project Overview

Embedded software for trains’ announcements, devices diagnostics, etc.

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Responsibilities:
  • Created microservices for device diagnostic, passenger announcements, camera feeds
  • Clarified requirements with the customer,
  • Created tasks for team members
  • Did code reviews
Project Tech stack:
Spring Boot
Microservices
Docker Compose
Docker
REST API
RabbitMQ
JUnit
Mockito
Jenkins
Maven
JavaScript
React
Senior Java Developer
Aug 2020 - Apr 20217 months
Project Overview

The project's goal was to reduce the data processing time to 2 hours instead of 36.

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Responsibilities:
  • Implemented workflow using Java, Google Guice, and AWS Lambda
  • Wrote unit tests
  • Wrote cloud formation
  • Implemented handlers to process DQL
Project Tech stack:
Lambda
AWS
AWS CloudFormation
Amazon ECS
Amazon SQS
Java
Java Developer
May 2020 - Jul 20202 months
Project Overview

The system provides a security risks analysis by the company's public domain. It shows all company's subdomains and all ports opened at those subdomains. The system also specifies what software the company uses at those ports/subdomains and so on. As a result, users get a detailed report of the security scans and security scores.

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Responsibilities:
  • Developed backend from scratch
  • Designed system
  • Integrated with 5+ 3rd party services
  • Improved app performance using concurrency
  • Wrote documentation and unit tests
Project Tech stack:
Java
Spring Boot 2.2.4
Maven
REST API
MongoDB
Quartz API
Project Lombok
Java
Spring Boot
Maven
MongoDB
Project Lombok
Software Developer
Mar 2020 - Jun 20202 months
Project Overview

The project is similar to Coursera but for schools and organizations. It is a multitenant SaaS.

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Responsibilities:

Volodymyr was responsible for the whole back-end from scratch:

  • Set up deployment process using AWS EC2
  • Developed appointment module
  • Set up video conference solution for instructors & employees
  • Implemented basic user flows
Project Tech stack:
Java
Java Core
Spring Boot
Stripe API
AWS
Amazon EC2
Amazon S3
Swagger
PostgreSQL
React
Angular
Senior Java Developer
Nov 2019 - Feb 20203 months
Project Overview

A solution for the bank that allows sending confirmation SMS to their clients. The most important thing on this project was related to clients' data protection.

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Responsibilities:

Volodymyr developed backend from scratch. Mainly, the project was related to API integration with 3d party service providers. Each API had 2-3 layers of data encryption.

Project Tech stack:
REST API
Spring Boot
Spring Data Jpa
Spring Scheduler
API integration by REST and SOAP
encrypting
MySQL
Maven
API
SOAP
MySQL
Maven
Java Developer
Mar 2019 - Nov 20197 months
Project Overview

Social Network for people loving cooking, where they can share recipes, leave comments for others' recipes, upload photos of already cooked food, and so on.

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Responsibilities:
  • Added new features
  • Fixed bugs
  • Deployed new changes
  • Debugged and resolved the application issues
  • Wrote unit, integration, and E2E tests
Project Tech stack:
Spring
Spring MVC
Spring Data JPA
Hibernate
Maven with flyway
PostgreSQL
Jenkins
Swagger
Amazon EC2
Amazon S3
Angular
PostgreSQL

Education

2012
Computer Science
Master's

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