Sr Java Full Stack Developer

Overview

Job Title: Sr Java Full Stack DeveloperLocation: Austin, TX

Job Type: Independent Contract (Contractor / Non-Employee)Start Date: ASAP

Pay Rate: $60-70/hr 1099 / C2C

Contract Length: 4 years

We are looking for a Senior Java Full Stack Developer with strong experience in designing, developing, deploying, and troubleshooting enterprise applications. The ideal candidate should have hands-on expertise in Java, Spring Boot, React, AWS, databases, CI/CD, microservices, and system/solution design. The candidate should be comfortable working at both the application development and architecture/design levels, with strong problem-solving and debugging skills in production environments.

Responsibilities

Key Responsibilities

• Design, develop, and maintain scalable applications using Java and Spring Boot.
• Develop responsive front-end applications using React and JavaScript.
• Design and implement RESTful APIs and microservices.
• Work with AWS services including S3, Lambda, EKS, ECS, and EC2.
• Develop and maintain infrastructure using Terraform, Ansible, and CloudFormation.
• Implement and manage CI/CD pipelines using Jenkins and GitHub Actions.
• Work with relational databases such as MySQL and Oracle.
• Work with NoSQL databases such as MongoDB and Cassandra.
• Participate in application, system, and solution architecture discussions.
• Design solutions that are scalable, reliable, secure, and production-ready.
• Troubleshoot application, deployment, performance, and production issues.
• Collaborate with engineering, DevOps, QA, and product teams.

Core Competencies

1. Basic System Design

The candidate should be able to:

• Create a simple architecture diagram for one of their productionized projects.
• Explain the major components and how they interact.
• Explain why specific technologies/components were selected.
• Describe frontend-to-backend communication, databases, APIs, messaging, deployment, and infrastructure.
• Discuss basic scalability, availability, security, and performance considerations.

2. Debugging & Production Troubleshooting

•      The candidate should demonstrate strong troubleshooting skills through real-world scenarios such as:
•      EKS/ECS deployment failure.
•      Application not starting after deployment.
•      Production performance degradation.
•      High CPU/memory utilization.
•      API latency or timeout issues.
•      Database connectivity/performance problems.
•      Service-to-service communication failures.

3. Java / Microservices Design Patterns

•      Candidate should have a strong understanding of commonly used Java and Microservices design patterns.
•      They should be able to explain:
•      The problem statement addressed by the pattern.
•      Detailed internal working of the pattern.
•      Advantages and limitations.
•      When and when not to use it.
•      A real-world implementation example.

4. Solution Design

•      Given a business or technical problem statement, the candidate should be able to:
•      Understand and clarify requirements.
•      Identify major system components.
•      Propose a high-level solution architecture.
•      Select appropriate technologies.
•      Explain data flow and component interactions.
•      Consider scalability, reliability, security, performance, and maintainability.

5. Java, Spring Boot & Coding

•      The candidate should demonstrate strong hands-on knowledge of:
•      Core Java and recent Java versions.
•      Object-oriented programming.
•      Collections, Streams, Lambda expressions, and exception handling.
•      Multithreading/concurrency.
•      Java 8+ features.
•      Spring Boot.
•      REST APIs.
•      Dependency Injection.
•      Spring Security and configuration.
•      Microservices development.
•      Unit/integration testing.
•      Writing clean, maintainable, production-quality code.
•      The candidate will also be evaluated through a Java/Spring Boot coding problem.

Qualifications

Required Technical Skills

Skill

Minimum Rating

Minimum Experience

Senior Developer

—

10+ Years

Java – Recent Versions

8/10

8+ Years

Spring Boot

8/10

5+ Years

React / Front-End Technologies

6/10

2+ Years

JavaScript

6/10

2+ Years

AWS – S3, Lambda, EKS, ECS, EC2

7/10

2+ Years

Infrastructure as Code – Terraform, Ansible, CloudFormation

6/10

1+ Years

CI/CD – Jenkins, GitHub Actions

5/10

2+ Years

RDBMS – MySQL, Oracle

8/10

8+ Years

NoSQL – MongoDB, Cassandra

7/10

1+ Years

System-Level Design / Frontend-to-Backend Architecture

7/10

3+ Years

Application Design

7/10

3+ Years

Architecture Understanding

7/10

3+ Years