Senior Java Backend Engineer - Spring Boot & Microservices

Quantum Technologies. LLC; McLean (VA); On-site; USD 150,000 - 190,000; Full time

Job summary

Quantum Technologies. LLC in McLean, VA is seeking a highly experienced Backend Engineer to design, develop, and maintain enterprise-grade backend systems using Java and Spring Boot.

You will own end-to-end backend feature lifecycles, implement RESTful APIs, and ensure secure, scalable inter-service communication. Collaborating with frontend, DevOps, QA, and product teams, you will drive architectural planning, perform code reviews, mentor junior developers, and uphold coding standards and

Qualifications

• 10+ years of backend development experience with Java (8+).
• Deep expertise in Spring Framework (Boot, Data, Security).
• Microservices architecture and API design experience.
• Experience with SQL databases (PostgreSQL, MySQL) and NoSQL stores (MongoDB, Redis).
• Docker and Kubernetes experience; CI/CD pipelines.
• Security principles: OAuth2/JWT, encryption.
• Strong problem-solving and communication skills.

Responsibilities

• Lead end-to-end lifecycle of backend features from design to deployment.
• Develop RESTful APIs and secure inter-service communication.
• Optimize performance, reliability, and scalability.
• Collaborate with frontend, DevOps, QA, and product teams.
• Conduct code reviews and mentor juniors.
• Participate in architecture and technical strategy.
• Troubleshoot complex production issues.

Skills

Java

Spring Boot

Microservices

REST API

CI/CD

Security

Tools

Docker

Kubernetes

PostgreSQL

MySQL

MongoDB

Redis

Kafka

RabbitMQ

JUnit

Mockito

Job description

Quantum Technologies. LLC in McLean, VA is seeking a highly experienced Backend Engineer to design, develop, and maintain enterprise-grade backend systems using Java and Spring Boot.

You will own end-to-end backend feature lifecycles, implement RESTful APIs, and ensure secure, scalable inter-service communication. Collaborating with frontend, DevOps, QA, and product teams, you will drive architectural planning, perform code reviews, mentor junior developers, and uphold coding standards and