Hire the Best JUnit Specialists

Dear Sir or Madam, My name is Oleksandr Prognimak. I have been working as a software developer for 33 years. I have extensive and longstanding experience in the following programming languages, frameworks, libraries, and technologies. Currently, my main focus is on the following IT areas: Java, JEE, Spring, Spring Boot, Angular, HTML5, JavaScript, TypeScript, CSS, SQL, PL/SQL, Docker, JUnit, Mockito, WireMock, Pact io, Maven, Oracle, PostgreSQL, and Azure Cloud. Here is the complete list of my skills: Skills, consulting, and development as a freelancer in the following areas: - Java: JDK 1.1 - 21, JSE, Swing, AWT - JEE: J2EE, JEE5,6,7,8,10 (Servlet, CDI, EJB, JPA, JMX, JMS, JSF) - Spring/Spring Boot: Spring Core, Spring Boot, Spring Test, Spring Data, Spring Integration, Spring Batch, Microservices - Cloud: Azure, AWS - Web Development/UI: Angular 4,7,10,16; Vue.js 2,3; TypeScript, GWT, Vaadin, JSP, JSF (RichFaces, PrimeFaces), HTML4, HTML5, JavaScript, JQuery, AJAX, Struts, Spring MVC - Web Services: SOAP, SOA, RESTful, Rest-API, OpenAPI, Swagger, RestEasy, Jersey, JSE HttpClient - ORM: Hibernate, EclipseLink, Apache OpenJPA - RDBMS/SQL: Oracle, Postgres, MySQL, MS-SQL, SQL, PL/SQL, MS Access, Teradata, H2 - App. Server/Servlet Container: Apache HTTP, Apache Tomcat, JBoss, Wildfly, Websphere, OC4J - XML Processing: AXIS-2, XPath, XSLT, XML Schemas, JAXP, JAXB - Build Tools: ANT, Maven, Gradle, Mojo - Source Code Management: GIT, GitLab, GitHub, Bitbucket, SVN, CVS - Case Tools/UML: Magic Draw, Software Architect, Together, ERWin, RationalRose - Report Tools: Jasper Report, BIRT Reports, Oracle Forms and Reports, Eclipse BI-Reports - Security: Java Security, JSSE, PKI, Websecurity, X509 - Test Tools/Testing: JUnit, TestNG, Cucumber, JBehave, Mockito, WireMock, EasyMock, Spring Test, Pact io, LoadTest, IntegrationTest, CI - MS-Office: VB, VBA, Excel-VBA, Access-VBA - Container Virtualization: Docker, Docker-Compose, Swarm, Kubernetes (K8) - Big Data: Apache Kafka, Zookeeper - Very Old Skills: C, C++, Basic, Pascal I am available immediately. Best regards, Oleksandr Prognimak

Senior Java Developer | Spring Boot Expert | Microservices | AWS | AI-Assisted Development I help businesses build scalable backend systems, enterprise APIs, and cloud-native applications using Java, Spring Boot, Hibernate, Microservices, AWS, PostgreSQL, MongoDB, Kafka, and modern AI-assisted development tools. With strong experience in Java backend development, I specialize in: ✔ Java 8/11/17+ Application Development ✔ Spring Boot & Microservices Architecture ✔ REST API Development & Third-Party Integrations ✔ Hibernate / JPA / Performance Optimization ✔ PostgreSQL, MySQL, MongoDB ✔ Event-Driven Systems (Kafka, Messaging) ✔ AWS, Docker, Kubernetes ✔ Secure APIs (Spring Security, JWT, OAuth) ✔ Legacy System Modernization ✔ Full-Stack Development (Angular, Node.js) ✔ AI-Assisted Development using ChatGPT, Claude AI, and GitHub Copilot What I Deliver • Production-grade Java Spring Boot applications • High-performance backend APIs • Scalable microservices architectures • Enterprise integrations and data-driven systems • Performance tuning, debugging, and system optimization • Cloud-ready deployments on AWS Why Clients Hire Me I focus on clean architecture, maintainable code, and practical solutions—not overengineering. By leveraging modern AI tools like ChatGPT, Claude AI, and GitHub Copilot, I accelerate development, improve code quality, generate documentation, and speed up debugging while ensuring every solution is thoroughly reviewed and production-ready. Whether you need: • A Spring Boot developer for a SaaS platform • A Java backend developer for APIs, integrations, or cloud applications • Help with microservices, performance optimization, or legacy modernization • A developer who combines deep engineering expertise with AI-assisted productivity I can help. I've worked on complex backend systems involving real-time event processing, enterprise integrations, database-intensive workflows, cloud-native deployments, and event-driven architectures. If you're looking for a reliable Java/Spring Boot expert who takes ownership, communicates proactively, and delivers scalable solutions on time, let's discuss your project.

Senior Java Backend Developer with 10+ years building production systems using Spring Boot, REST APIs, and enterprise databases. CORE EXPERTISE: - Spring Boot, Spring MVC, Spring Data JPA, Spring Security - RESTful API design and development - Database design: MySQL, Oracle - Enterprise system integration - Production support and troubleshooting WHAT I DELIVER: - Spring Boot Enterprise applications and RESTful APIs - Database design and optimization (PostgreSQL, MySQL, Oracle) - System integrations and workflow engines - Application support and troubleshooting RECENT HIGHLIGHTS: - Built configurable workflow engine processing thousands of events - Designed multi-system integrations with comprehensive error handling - Kotlin + Spring Boot experience TECHNICAL SKILLS: Java, Spring Boot, Spring Framework, Kotlin, REST APIs, PostgreSQL, MySQL, AWS, Docker, Git, Agile/Scrum MICROSERVICES KNOWLEDGE: - Strong understanding of microservices architecture patterns through coursework and demo projects. Seeking opportunities to apply this knowledge in production environments and build distributed systems expertise under experienced architects. I have a 5.0 Upwork rating and clients describe me as "professional, responsive, and genuinely committed to delivering high-quality work." Available for long-term contracts (30+ hours/week).

✍🏻 Are you in search of a highly skilled Software QA Engineer with expertise in Performance testing, Performance engineering, Automation testing, Load testing, and Security testing? Look no further! With over 15+ years of experience in the QA industry, I have a proven track record of delivering exceptional software quality solutions to clients. My specialization lies in Performance testing, where I ensure that applications perform optimally, handle high loads, and deliver seamless user experiences. ⭐QA Services ⭐ ✅ Performance Testing ✅ Automation Testing ✅ Security/Penetration Testing ✅ Functional Testing/Regression/Acceptance Testing ✅ Usability Testing ✅ Mobile App Testing (IOS / Android) ✅ Strong knowledge of HTML, CSS and SQL, Python, and Java programming ✅ User Acceptance Testing ✅ API Testing ✅ Experience in SOAP API / REST API/ GraphQL 🛠️ Tools Expertise : ✅ ️Performance testing: JMeter, LoadRunner, Neoload, Gatling, Blaze Meter and K6 ✅ ️Web Automation : Selenium WebDriver, WebDriver.IO, ✅ Defect Tracking Tool: JIRA, Bugzilla, Test Rail ✅ ️Mobile testing: Appium ✅ Monitoring Tools: Dynatrace, AppDynamics, DxApm, Introscope, and Net Diagnostics ✅ Cloud Server Monitoring: AWS Could watch, Open Shift Container, GCP ✅ Data visualization: Splunk, Kibana ✅ Load Generator : Redline13, Balzemeter, LR ✅ ️API testing: Postman, Swagger, Insomnia, Fiddler ✅ ️Cross-browser testing: Browser Stack, Sauce Labs ✅ ️Version Control: Git, Github, GitLab, Bitbucket, Perforce ✅ ️Databases: MongoDB, SQL, MYSQL, Oracle ✅ ️CI/CD: Jenkins, Azure DevOps, Bamboo ✅ ️Build Management: Ant, Maven, Gradle ✅ ️Frameworks: Cucumber, TestNG, JUnit, Mocha, Jasmine ✅ ️Programming knowledge: Java, HTML, JavaScript, Python ➰ Performance Testing Framework ➰ ✅ ️JMeter + Perfmon+ Jenkins ✅ ️JMeter + Jenkins + Grafana ✅ ️JMeter + InfluxDB ✅ ️JMeter + RedLine13/BlazeMeter ⭐ Domain Knowledge ⭐ 📌 E-commerce and retail 📌 Healthcare and medical devices 📌 Finance and banking 📌 Gaming and entertainment 📌 Education and e-learning

When your backend is breaking under load, your microservices are drifting, or your APIs aren't talking to each other, I'm the engineer who fixes it without breaking everything else. I build and maintain production-grade systems using Java Spring Boot, React, Node.js, and cloud-native infrastructure. My work runs at scale: Microservices handling 20,000+ concurrent users (Spring Boot + Kafka + Kubernetes) REST APIs serving 50,000+ monthly users with clean contracts and error handling CI/CD pipelines on GitHub Actions and Jenkins with automated test gates AWS deployments (EC2, EKS, ECR, ALB) with zero-downtime rolling releases Elasticsearch integration cutting search response times from 800ms to under 200ms OAuth 2.0 + TLS security reducing vulnerability incidents by 70% What I help with: Java Spring Boot microservices, build, fix, optimize React frontend connected to backend APIs Kafka event-driven architecture Docker + Kubernetes deployments AWS cloud infrastructure CI/CD pipeline setup and maintenance API integration and debugging 100% Job Success · Rising Talent · 0-4hr response time If your system is slow, broken, or needs scaling, message me and I'll tell you exactly what's wrong.

Atlassian Certified Jira Consultant and Forge Developer with 15+ years of experience and 3500+ hours of Jira Administration. Expert in Jira addons Structure, BigPicture, eazyBI, Tempo, ScriptRunner, Rich Filters, Jira Automation, and Forge App Development. I help companies transform Jira from a task tracker into a scalable delivery, reporting, and service management platform. Specialized in Jira Software, Jira Service Management, integrations, custom development, and enterprise Jira frameworks. Achievements ⭐️ Atlassian Certified in Managing Jira Projects for Cloud ⭐️ Atlassian Certified Jira Administrator for Cloud ⭐️ 20+ clients (10 to 500 users), doing fixed price projects and providing longterm Jira support ⭐️ 3500+ hours of Jira administration ⭐️ 16+ years of working experience as team lead and project/product manager ⭐️ led 16 workshops on different Jira topics ⭐️ speaker at IAMPM courses ⭐️ Forge developer ⭐️ developed MS Project plugin for JIRA integration I can help you with 🛠 configure custom workflows, custom fields, screens, permissions and notifications settings 🛠 automate processes and repetitive tasks (Automation add-on and groovy scripting with ScriptRunner add-ons) 🛠 create advanced custom reports of any complexity for Jira Server/DC (inside JIRA or in 3rd-party BI solutions and reporting services) 🛠 develop MS Project addons for integrations with other tools (like Jira) 🛠 analyze JIRA Server data using SQL working directly with database. Such a practice helps clients to get quick insights from Jira data and to find data inconsistencies 🛠 custom development of API’s, integrations with Tempo and Table Grid Editor API 🛠 help you to decide on the best suitable and powerful enough add-ons 🛠 configure third-party add-ons (Tempo Timesheet, Tempo Planner, EasyBI, Table Grid Editor, Rich Filters, SIL, Structure, Big Picture) 🛠 audit your instance, point to the bottlenecks, suggest improvements and implement an instance cleanup 🛠 provide a consultancy service or ongoing support During my career, I've worked with the Atlassian tools as a: 🔥 Project/Product/Program Manager 🔥 Team Lead 🔥 Jira Administrator 🔥 CMMI Appraisal Team member 🔥 Software Developer (Oracle and MS SQL Server DB Developer) This experience helps me understand business processes for different project roles My favorite Jira add-ons are ScriptRunner, MyGroovy and EasyBI. These add-ons allow making complex automations, integrations and data analyses with no limits. My approach is to be a business analyst before doing any task. At the beginning, I try to understand client needs and requirements. In most cases, I develop a prototype or simulate the case in my test environment. Then I suggest effective ways to accomplish the task based on my experience and knowledge of best practices. I’m organized, committed to quality, process and result oriented If this is something I can help you with, please reach out! Contact me for any Jira consultation task