Sr Java Full Stack Developer

Overview

Job Title: Sr Java Full Stack Developer

Location: 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

• T he candidate should demonstrate strong hands-on knowledge of:
• C ore 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