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Denis Nakajima

@denisnakajima

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Senior software engineer focused on scalable, high-performance web and backend systems with clean architecture.

Romania

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What I'm looking for

I’m looking for a team where I can own architecture and performance end-to-end—building scalable web/backend systems with clean design, microservices and event-driven patterns, and strong collaboration in distributed development.

I’m a Senior Software Engineer with 10+ years building web and backend systems, specializing in high-performance applications across modern frontend and backend ecosystems. I lead application development end-to-end—from design to deployment—staying grounded in clean architecture, scalability, and maintainable code.

In my recent role, I led full-stack development using React/Next.js with Java Spring Boot and Python-based services. I designed microservices and BFF architectures, exposed REST and GraphQL APIs, and implemented authentication and authorization with JWT and OAuth2/OpenID Connect.

I’m at my best optimizing performance and reliability: SSR/SSG strategies, caching layers, query optimization, and frontend code splitting. I also work deeply with event-driven systems (Redis, RabbitMQ, Kafka), cloud-native deployments (Docker, Kubernetes, Terraform, AWS), and I actively collaborate with distributed teams while mentoring others.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Evozon

Sep 2025 - May 2026 (8 months)

Led full-stack development using React/Next.js with Java Spring Boot and Python services, focusing on maintainable architecture and performance optimization. Designed microservices and BFF systems with REST/GraphQL, implemented JWT and OAuth2/OpenID Connect auth, and delivered cloud-native deployments on Docker, Kubernetes, and AWS.

React Next.js Spring Boot fastAPI GraphQL JWT OpenID Connect Microservices Docker Kubernetes AWS

Software Engineer

Pivotal

Dec 2020 - Jun 2025 (4 years 6 months)

Developed enterprise web applications using Java Spring Boot and React/Angular, building secure REST and GraphQL APIs with JWT and OAuth2. Built responsive frontend features with Redux Toolkit and Material UI, optimized PostgreSQL/Redis/MongoDB data access, and implemented event-driven processing with RabbitMQ and Apache Kafka.

Java Spring Boot React Angular REST GraphQL JWT PostgreSQL RabbitMQ Apache Kafka

Web Developer

SDG Group Espana

Aug 2019 - Oct 2020 (1 year 2 months)

Built web applications and backend services using React/Vue.js and Java/Spring Boot or Flask for analytics and business platforms. Designed and optimized SQL queries for PostgreSQL/MySQL, integrated external services, and supported deployments using Docker and Linux.

React Vue.Js Java Spring Boot Flask SQL PostgreSQL MySQL Docker Linux

Java Developer

Movistar Estudiantes

Nov 2016 - Aug 2019 (2 years 9 months)

Developed and maintained JavaScript/Java web applications supporting internal systems and operational workflows. Implemented responsive UI features, worked with backend services and relational databases, and supported API integration, troubleshooting, and agile delivery.