Java Developer at Joulz via Syntouch

Engineering resilient Java systems with care for the people using them.

I'm Deniz, a software engineer with hands-on experience shipping production backends and full-stack apps in enterprise environments. I focus on Java (Spring Boot, Quarkus), clean RESTful APIs, system integrations, and the CI/CD that ships them safely.

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01 / About

A pragmatic engineer with a builder's mindset.

I gravitate toward the hard middle of software: the integrations, the data flows, and the places where requirements are fuzzy and reliability matters. I like turning vague enterprise needs into systems that are simple to operate, easy to extend, and pleasant to work in.

Beyond shipping features, I care about the developer experience around them: clean module boundaries, meaningful tests, fast feedback loops in CI/CD, and code that the next engineer can actually read. Critical mindset, fast learning curve, and a strong bias for clarity over cleverness.

02 / Experience

Where I've shipped.

  1. Java Consultant

    Syntouch

    Sep 2026 - Present
    • Working as a Java consultant, helping clients turn business needs into reliable, maintainable software solutions.
    • Since October 2026 working as a Java Developer at Joulz, building Spring Boot microservices for energy infrastructure.
    JavaSpring BootKubernetesAngularConsultingAgile / Scrum

  2. Full Stack Java Developer

    Quintor

    Sep 2024 - Jun 2026
    • Built a Spring Boot platform aggregating data from 4+ external systems (GitLab, Azure DevOps, SonarQube, TeamCity), powering automated SLA reporting consumed by enterprise customers.
    • Modernized the Quintor Java Masterclass to Java 21 and Spring Boot 3, including Maven and Gradle build configurations.
    • Designed an asynchronous Quarkus + Mutiny module for the masterclass to teach reactive Java in production.
    Java 21Spring BootSpring ModulithMongoDBVue.jsQuarkusMutiny

  3. Graduation Internship

    Quintor

    Jan 2024 - Jun 2024
    • Built an AI-integrated request portal with Spring Boot, Spring AI, and GPT models, including custom fine-tuning and real-time WebSocket communication.
    • Implemented automated classification workflows that routed incoming requests with high precision.
    Spring BootSpring AIGPTWebSockets

  4. Software Engineering Intern

    LiveWall

    Aug 2022 - Jan 2023
    • Researched and rolled out unit, integration, and end-to-end testing strategies across React/Next.js and PHP applications.
    • Implemented test suites with Jest, Playwright, and PHPUnit, measurably improving regression detection.
    ReactNext.jsJestPlaywrightPHPPHPUnit

03 / Selected Work

Things I've built recently.

Quintor

Dec 2025 - Mar 2026

Managed Services Reporting Platform

Production full-stack reporting platform giving enterprise customers structural insight into hosted applications and infrastructure. Consolidates data from GitLab, Azure DevOps, SonarQube, and TeamCity into dashboards and generated .docx customer reports used in real SLA evaluations.

Java 21Spring ModulithSpring Data MongoDBSpring SecurityVue.jsOpenSearch

Quintor

Jun 2025 - Aug 2025

Java Masterclass - Reactive Update

Modernized the curriculum from Java 8 / Spring Boot 2 to Java 21 / Spring Boot 3, and built a new reactive Quarkus + Mutiny module backed by Reactive MongoDB to teach non-blocking Java in production.

Java 21Spring Boot 3QuarkusMutinyReactive MongoDBMapstruct

Quintor - Graduation

Jan 2024 - Jun 2024

AI-Integrated Request Portal

AI-powered request portal using Spring Boot and Spring AI integrating GPT models, with real-time WebSocket communication, automated classification workflows, and the ability to fine-tune custom GPT models for domain-specific use cases.

Spring BootSpring AIGPTWebSockets

LiveWall

Aug 2022 - Jan 2023

Test Automation Strategy

Researched modern testing strategies and implemented automated unit, integration, and end-to-end tests across a React frontend (Jest, Playwright) and a PHP backend (PHPUnit), improving reliability and regression detection.

ReactNext.jsJestPlaywrightPHPPHPUnit

04 / Toolbox

Languages, frameworks and the rest.

Languages

JavaTypeScriptSQL

Backend

Spring BootQuarkusSpring AIJPA / HibernateRESTJUnitMockitoAssertJMockoon

Frontend

ReactVueAngularNext.js

Data

MySQLPostgreSQLMongoDBOpenSearch

Platform

DockerCI / CDMavenGradleSonarQubeTeamCityGitHub Actions

Practice

Agile / ScrumCode reviewKnowledge sharing
EnglishFluent
DutchFluent
TurkishFluent

05 / Credentials

Education & certifications.

Education

BSc Informatica

Avans University of Applied Sciences

2020 - 2024

Certification

Oracle Certified Professional - Java SE 17

Oracle

Issued 2025

Certification

Professional Scrum Master™ I (PSM I)

Scrum.org

Issued 2026

Certification

Professional Scrum Product Owner™ I (PSPO I)

Scrum.org

Issued 2026

Certification

Microsoft Certified: Azure Fundamentals (AZ-900)

Microsoft

Issued 2026

Got a problem worth solving?

I enjoy connecting with people who care about backend craft, thoughtful system design, and product thinking. Let's talk.

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