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Mostafa Hosseinzadeh

@mostafahosseinzadeh

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Senior Java developer specializing in cloud-native microservices, performance, and scalable systems.

Armenia

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What I'm looking for

I seek a role building cloud-native, event-driven backend systems where I can improve performance, mentor engineers, and work with strong CI/CD and observability practices.

I am a Senior Java developer with 9+ years building high-throughput, distributed systems for enterprise and EU clients, focused on Java 17/21 and Spring Boot 3.x.

I have delivered measurable performance improvements (up to 8×), scaled services to 200+ RPS, and implemented event-driven architectures using Kafka, Kubernetes, and robust CI/CD pipelines with observability via Prometheus and Grafana.

I collaborate closely with front-end teams, mentor junior engineers, and drive reliable cloud-native solutions that prioritize maintainability, security (Keycloak, OAuth2), and data-driven feature rollouts.

Experience

Work history, roles, and key accomplishments

Senior Java Developer

Freelance

Aug 2025 - Feb 2026 (6 months)

Developed and maintained backend microservices using Java 21 and Spring Boot 3.x, improving API response times and system stability; implemented feature flagging, modernized CI testing, and built event pipelines for analytics.

Java 21+Spring Boot Kafka AWS CI CD Docker Kubernetes API Design

Senior Java Developer

Sadad Information Technology

Mar 2023 - Aug 2025 (2 years 5 months)

Designed and developed Java 21 Spring Boot microservices, refactored architecture to handle 200+ RPS, implemented Kafka-based event-driven communication and CI/CD with Kubernetes for improved resilience and observability.

Java 21+Spring Boot Kafka CI CD Docker Kubernetes Prometheus Grafana Keycloak

Full Stack Java Developer

Safir Ertebatat (Vira)

Jan 2020 - Mar 2023 (3 years 2 months)

Led development of a large-scale ERP processing payroll for 22,000 monthly users and achieved 8× processing speed improvement by migrating legacy modules to microservices and designing scalable Spring Boot APIs.

Java Spring Boot RESTful APIs Microservices PostgreSQL Oracle Docker Team Leadership Performance Optimization

Full Stack Java Developer

Iran University of Science and Technology

Aug 2019 - Oct 2020 (1 year 2 months)

Implemented Event Sourcing and CQRS solutions to improve performance and scalability; contributed to an IoT Gateway using Node.js and MQTT for Raspberry Pi deployments.

Event Sourcing CQRS Java Node MQTT IoT System Design Raspberry Pi Performance Optimization

Full Stack Java Developer

Rahbord Andishan & Fanap

Jun 2017 - Jul 2019 (2 years 1 month)

Developed enterprise applications using Java EE, JAX-RS, JSF and Angular, and created UML diagrams to support maritime system integration and testing.

Java EE Jax JSF Angular UML Integration Testing enterprise applications PHP

Full Stack Java Developer

RahbordAndishan & Fanap

Jun 2017 - Jul 2019 (2 years 1 month)

Developed enterprise applications using Java EE, JAX-RS and Angular; created UML diagrams and simulated maritime tracking components to support integration testing and decision-making.

Java EE Jax Angular UML Integration Testing Simulation PHP enterprise applications

Java Developer

Gomaneh

Aug 2014 - May 2017 (2 years 9 months)

Built and maintained server-side APIs using Java and PHP to support front-end applications and integrated backend services for improved client functionality.

Java PHP RESTful APIs Server Side Development API Integration Backend Development Web Services