İsa is currently unavailable
İsa Ölmez
Verified Expert in Engineering
Full-stack Developer
Izmir, İzmir, Turkey
Toptal member since August 13, 2020
Bio
İsa is a software engineer with more than a decade of experience. While İsa is a full-stack developer whose areas of expertise are with Java, Spring, and Spring Boot, he would describe his past work as primarily back-end development with exposure to the front end. İsa also has robust OOP skills and ample experience in software design. İsa can successfully develop his section of a project as well as thoroughly explain the most relevant parts of his source code, so he works well in teams.
Portfolio
Eldermark
Groovy, Vue, Amazon Web Services (AWS), Spring Boot, Spring Security...
Priceline
Java, Spring, Spring Boot, Oracle Database, REST APIs, JDBC, SQL...
Fortune 100 North American Construction Equipment Manufacturer
Azure, Azure Functions, Azure Cosmos DB, Azure Blobs, Spring Boot...
Experience
- Java - 12 years
- Spring - 8 years
- APIs - 8 years
- Message Queues - 6 years
- Spring Boot - 6 years
- Amazon Web Services (AWS) - 5 years
- Azure - 2 years
- Kubernetes - 2 years
Work Experience
Senior Full-stack Developer
2023 - 2024
Eldermark
- Developed the MVP in ten months, contributing to all parts of the application development process.
- Implemented the security layer using OAuth2 to integrate with different third parties.
- Created a webhook system that captures the entity updates and notifies the related integration parties.
Technologies: Groovy, Vue, Amazon Web Services (AWS), Spring Boot, Spring Security, Spring MVC, Amazon Simple Queue Service (SQS), Amazon RDS, OAuth 2, Amazon Cognito, TypeScript, HTML, CSS, Jira, Confluence, Scrum, Microservices
Senior Full-stack Developer
2021 - 2022
Priceline
- Initiated and developed a major integration with another travel agency.
- Worked on the migration of the direct database calls to an internal REST API in multiple modules.
- Implemented several infrastructural enhancements to the project to be used by multiple modules.
Technologies: Java, Spring, Spring Boot, Oracle Database, REST APIs, JDBC, SQL, RESTful Services, Back-end, Cloud, Relational Databases, Distributed Systems, Microservices, APIs, Java 11, Unit Testing, Integration Testing, Jira, Confluence, Scrum
Senior Full-stack Developer
2020 - 2021
Fortune 100 North American Construction Equipment Manufacturer
- Participated in enhancing the application performance to handle new clients, sending around one million requests per day.
- Refactored an existing application and implemented the new features covering Spring Boot, Azure Function Apps, and React.
- Created monitoring support for the application using Azure Application Insights.
Technologies: Azure, Azure Functions, Azure Cosmos DB, Azure Blobs, Spring Boot, Spring Security, OAuth 2, React, Angular, Spring Data JPA, Selenium, OpenID Connect (OIDC), Azure App Service, Continuous Integration (CI), Hibernate, Full-stack, REST APIs, JDBC, SQL, RESTful Services, Back-end, Cloud, NoSQL, Relational Databases, JavaScript, Microservices, APIs, Java 11, Unit Testing, Integration Testing, C#, .NET, AngularJS, HTML, CSS, Jira, Confluence, Scrum
Senior Full-stack Developer
2019 - 2020
FlexEngage
- Refactored the existing messaging infrastructure to work with Amazon SQS instead of ActiveMQ which increased the throughput.
- Enhanced the logging infrastructure to preserve critical correlation data between more than 20 different messaging applications as a result, traceability was improved.
- Built a testing infrastructure using Cucumber to test back-end services.
Technologies: Cucumber, Continuous Delivery (CD), Apache Maven, Stream Processing, Spring Security, Database Design, ActiveMQ, Message Queues, Amazon Web Services (AWS), Hibernate, Scrum, Git, Linux, MySQL, Jenkins, Docker, Amazon Kinesis, Amazon Simple Queue Service (SQS), Amazon DynamoDB, Amazon S3 (AWS S3), Java Message Service (JMS), Spring Boot, Spring, Kotlin, Java, Spring Data JPA, Karate API Testing, Continuous Integration (CI), Jenkins Pipeline, Full-stack, REST APIs, JDBC, SQL, RESTful Services, Back-end, Cloud, NoSQL, Relational Databases, JavaScript, Relational Database Services (RDS), Distributed Systems, Microservices, APIs, Unit Testing, Integration Testing
Senior Full-stack Developer
2017 - 2019
Emakina Group (Belgium)
- Implemented an event-driven middleware application to process legal investigation requests. The application collected data from multiple data sources using Spring Boot and Spring JMS.
- Participated in the integration phase of Belgium's two big telecom companies, Base and Telenet, working on every application stack layer.
- Implemented the monitoring functionality, which supports JMS endpoints/clients and REST endpoints/clients, thus improving traceability.
Technologies: Cucumber, Continuous Delivery (CD), Apache Maven, Spring Security, Database Design, Message Queues, Jenkins, Hibernate, Scrum, Git, Linux, Spring, Angular, MySQL, Oracle Database, Oracle, MongoDB, ActiveMQ, Java Message Service (JMS), Spring MVC, Spring Boot, Java, Selenium, Spring Data JPA, Jenkins Pipeline, Continuous Integration (CI), Full-stack, REST APIs, JDBC, SQL, RESTful Services, Back-end, NoSQL, JavaScript, Relational Databases, Distributed Systems, Microservices, APIs, Unit Testing, Integration Testing, HTML, CSS
Senior Full-stack Developer
2016 - 2017
Emakina Netherlands
- Implemented new features for the Unilever Food Solutions website, Ufs.com, which was rolled out in more than 50 countries.
- Developed event-driven applications for the asynchronous processing of online customer data, which improved the system's fault tolerance.
- Enhanced the search layer using AWS CloudSearch to support new business features.
Technologies: Apache Maven, Spring Security, Database Design, Redis, Amazon Web Services (AWS), Hibernate, Scrum, Git, Linux, Spring, Amazon CloudSearch, Amazon DynamoDB, Amazon S3 (AWS S3), MySQL, Spring MVC, Spring Boot, Java, Selenium, Spring Data JPA, Full-stack, REST APIs, JDBC, SQL, RESTful Services, Back-end, Cloud, NoSQL, JavaScript, Relational Database Services (RDS), Relational Databases, APIs, Unit Testing, Integration Testing, HTML, CSS, Jira, Confluence
System Architect
2013 - 2015
Comodo
- Reimplemented the existing legacy solutions with the latest modern technologies for an advertising network that has more than 20 million views per day.
- Created the big data pipelines from scratch using Apache Storm, Apache Hadoop, Apache Kafka, and others.
- Guided the whole team in the adoption of the newly introduced big data technologies.
Technologies: Apache Maven, Stream Processing, Apache Cassandra, Apache Storm, Database Design, Message Queues, Scrum, Git, Linux, MySQL, RabbitMQ, Redis, MongoDB, Apache Kafka, Hadoop, Spring, Java, JDBC, SQL, REST APIs, RESTful Services, Back-end, NoSQL, JavaScript, Relational Databases, Distributed Systems, Microservices, APIs, Unit Testing, Integration Testing
Software Engineer
2010 - 2013
STM Software
- Implemented new features for the command control and information systems of NATO.
- Developed a plugin system for a chat application used by the military personnel.
- Developed an Eclipse RCP-based application for a network simulation project.
Technologies: Hibernate, Spring, Java, Back-end, Relational Databases, JavaScript, Unit Testing
Project History
FlexEngage
FlexEnagage is an application designed to collect receipts from various clients via different web services. As one of the senior back-end developers, I developed new features and refactored the system to handle the increasing load. The application stack was composed of Java, Kotlin, Spring, Spring Boot, and AWS services.
Base Telecom Web Applications
Base Telecom's web application suite serves end-users, branch offices, and government offices. As a senior back-end developer, I developed new features and new integrations. During this period, I successfully worked with various technology stacks while collaborating with different teams.
Javabyexamples.com
http://www.javabyexamples.com/Javabyexamples.com is a technology blog focusing on Java- and Spring-related topics. I am the founder of the site, and it operates on a Kubernetes cluster. I migrated the site from WordPress to Spring MVC to fully control the development process.
Education
2001 - 2006
Bachelor's Degree in Computer Science
Bilkent University - Ankara, Turkey
Certifications
DECEMBER 2022 - DECEMBER 2025
Certified Kubernetes Application Developer (CKAD)
The Linux Foundation
JUNE 2022 - JUNE 2024
Confluent Certified Developer for Apache Kafka
Confluent
SEPTEMBER 2021 - SEPTEMBER 2022
Microsoft Certified: Azure Developer Associate
Microsoft
SEPTEMBER 2020 - SEPTEMBER 2023
AWS Certified Developer - Associate
Amazon Web Services (AWS)
OCTOBER 2019 - PRESENT
Pivotal Certified Spring Professional
Pivotal Software, Inc.
MARCH 2016 - PRESENT
Certified Developer on Apache Cassandra
Datastax
FEBRUARY 2015 - PRESENT
Cloudera Certified Developer for Apache Hadoop (CCDH)
Cloudera
JUNE 2013 - PRESENT
Oracle Certified Professional, Java SE 7 Programmer
Oracle
Skills
Libraries/APIs
Java Message Service (JMS), REST APIs, JDBC, Jenkins Pipeline, React, Vue
Tools
Apache Maven, Git, ActiveMQ, Jenkins, IntelliJ IDEA, Amazon Simple Queue Service (SQS), RabbitMQ, Amazon Simple Email Service (SES), Terraform, Cucumber, Karate API Testing, Apache Storm, Azure App Service, Amazon Cognito, Jira, Confluence
Languages
Java, Java 11, SQL, JavaScript, Kotlin, Groovy, TypeScript, C#, HTML, CSS
Frameworks
Spring, Spring Boot, Spring MVC, Hibernate, Spring Security, Selenium, Angular, Hadoop, OAuth 2, AngularJS, .NET
Paradigms
Unit Testing, Object-oriented Programming (OOP), Database Design, Scrum, Microservices, Continuous Integration (CI), Continuous Delivery (CD)
Platforms
Linux, Amazon Web Services (AWS), Azure, Kubernetes, Docker, Oracle, Oracle Database, Apache Kafka, Amazon EC2, Azure Functions
Storage
MySQL, Amazon S3 (AWS S3), Amazon DynamoDB, Spring Data JPA, NoSQL, Relational Databases, MongoDB, Redis, Datadog, Azure Cosmos DB, Azure Blobs, PostgreSQL
Other
Back-end, Integration Testing, Web App Development, Message Queues, RESTful Services, Cloud, Distributed Systems, APIs, Apache Cassandra, Stream Processing, Amazon Kinesis, Relational Database Services (RDS), Amazon CloudSearch, OpenID Connect (OIDC), Full-stack, SOAP, Spring Cloud, Amazon RDS, Domain-driven Design (DDD)
Collaboration That Works
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
1
Share your needs
Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2
Choose your talent
Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3
Start your risk-free talent trial
Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.
Top talent is in high demand.
Start hiring