Sr Java Full Stack Developer

Job Description

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

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

Full-time