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Keystone Consulting, Inc

Senior Java Developer IV

Madison, WI, United States

$56 to $79 USD / hour

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Job details

Pay: $56 to $79 USD / hour
Posting language: English
Posted: Nov 4, 2026

Original job description

We are seeking a highly skilled and experienced Senior Java Developer with strong hands-on expertise in Java, Spring framework/Spring Boot, Messaging Queues, Caching and Angular to join our client’s dynamic team. The ideal candidate will develop, and maintain robust, scalable, and high-performance applications seamlessly integrating Java-based backend systems with Angular-based front-ends. This role requires a proactive problem solver who thrives in a collaborative, fast-paced environment.

Important

Details:

Onsite or Remote: Candidate MUST be a resident local to Madison or near the Madison office, or willing to relocate to Madison prior to starting the role at their own expense. The selected hire can work 100% remote from within the Madison area but must be available to come into the office if needed. Candidate must be relocated 1 month after Hire Date.

Interview Process: Two Round Interview Process. Both rounds will be In-person interviews only.

Contract Duration: 6/30/2027, likely to extend.

Key

Responsibilities:

Develop and maintain Java (8 to 21)-based backend applications, ensuring high performance and scalability.
Unit test and code coverage using Junit.
Use spring boot, messaging queues, caching and Kafka, Redis and or equivalent tools.
Develop and maintain Angular (21)-based front-end user interfaces with a focus on responsiveness, usability, and ADA/WCAG compliance.
Unit tests using Junit and PlayWright.
Collaborate with cross-functional teams, including business analysts, and APM/QA engineers, to gather and implement requirements.
Create and maintain RESTful APIs for seamless integration between frontend and backend systems.
Troubleshoot and resolve technical issues, ensuring system reliability and robustness.
Stay up to date with industry trends, emerging technologies, and best practices in Java and Angular development.
Code reviews and contribute to code quality and standards to ensure high-quality product delivery.
Participate in the full software development lifecycle, including requirements gathering, design, coding, testing, and deployment.

Requirements

Required

Skills:

Strong proficiency in Java, Spring Framework (Spring Boot), Hibernate/JPA, Message queuing, and caching. (8 + yrs experience).
Experience with web applications development, web services, REST API, etc. (8 + yrs experience).
Advanced skills in Angular (21), Typescript, HTML5, and CSS3.
Experience designing, creating, and documenting RESTful API using Spring Boot and OpenAPI.
Practical knowledge of, and experience with, various middleware platforms like Apache Kafka, Redis, and BOOMI.
Familiarity with CI/CD pipelines, deployment automation, and dynamic environment configuration.
Experience developing wire frames and mock-ups as a tool to communicate design concepts with stakeholders.
Strong knowledge of relational databases like Oracle.
Familiarity with cloud platforms like AWS, Azure, Google Cloud.
Excellent problem-solving and analytical skills.
Strong verbal and written communication skills.
Proven ability to work both independently and collaboratively in a team environment.
Knowledge of containerization and orchestration tools like Docker and Kubernetes.
Familiarity with Agile/Scrum, Iterative, and waterfall development methodologies.
Experience using AI(Prompts/Skills/MCP) to speed up development process.

Nice to

Have Skills:

Dell Boomi, Dynatrace, Microsoft Azure DevOps, Docker, Kubernetes.

Benefits

Hourly rate for 1099: $79.00

Hourly rate for W2: $56.00

Full-Time W2 employees may receive the following benefits:

Health and Dental Insurance
Life Insurance
Short/Long Term Disability Insurance
Simple IRA
Referral Bonus
Employee Assistance Program

Keystone Consulting, Inc. is an equal opportunity employer and is following Wisconsin’s Contract Compliance law. U.S. Citizens and those authorized to work in the U.S. are encouraged to apply. We are unable to sponsor at this time.

Keystone Consulting, Inc. participates in E-Verify. For more information, please click the following links:

E-Verify Participation

Right to Work

Derecho a Trabajar

WI Contract Compliance Law

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More about this job

Skills

Oracle Java
Spring Framework
Spring Boot
JUnit
Apache Kafka
Redis
API development
Troubleshoot
Requirements gathering
HTML
CSS
RESTful API
CI/CD
Oracle
AWS
Microsoft Azure
Google Cloud
Problem solving
Analytical skills
Communication skills
Docker
Kubernetes
Agile
Scrum
Waterfall development
Dynatrace
DevOps

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