Freelance Java Backend Developer Jobs in Kansas (NOW HIRING)

About the role

We are looking for a Senior Software Engineer to join a newly formed team focused on accelerating the capabilities of the NinjaOne platform through manifest-driven development. This team is being built from the ground up and has ambitious goals to remake how NinjaOne delivers features — with a direct, visible impact on customer value.

The team's mission is to build flexible, customizable experiences that let customers and MSPs tailor the platform to their own workflows — from UI components to deeper integrations. We're still early in this journey, with a lot of the vision ahead of us rather than behind. If you're excited about designing extensible systems that put more power in users' hands, this is a great place to have that impact.

Location – We are flexible on remote working from home, if you are located in the USA and reside in one of the following states: CA, CO, CT, FL, GA, *IL, KS, MA, MD, ME, NJ, NC, NY, OR, TN, TX, VA, and WA. We have physical offices in Austin, TX and Tampa, FL, if you prefer a hybrid option.

We hire the best software engineers, but experience in our stack can’t hurt: NinjaOne is built on Java, Kotlin, Python, C++, Golang, and Postgres, supporting millions of user endpoints and running as a scalable cloud service in AWS. Knowing large-scale datastore bottlenecks, asynchronous application design, and client-server architecture will help you.

• Manifest-driven development to extend NinjaOne platform capabilities.
• Python development to create workers that extend NinjaOne’s value via third-party integrations.
• Java and Kotlin backend development to expose NinjaOne platform functions for extensibility.
• Collaborate with the AI workflow, server, and platform teams to achieve the team’s mission.
• Participate in architecture and design reviews to build high-quality software that is scalable and API-first.
• Troubleshoot production issues across the technical stack using logs, metrics, and traces.
• Other duties as needed.

About you

• Bachelor’s degree in Computer Science, Computer Engineering, Information Technology, or equivalent work experience.
• 10+ years of experience in Java software development for product applications, or equivalent, with solid expertise in Kotlin. Python experience is a plus but not required — we value adaptable engineers who can work across languages as needed.
• 4+ years of experience working with highly scalable software systems.
• Experience leveraging AI tooling to accelerate software development.
• Experience working on systems at scale and finding solutions to scale systems further.
• Working knowledge of a breadth of OOP design principles.
• Expertise in scaling data structures and object-oriented design.
• Knowledge of API best practices and REST service development using frameworks like Jersey or Spring.
• Relational database design and development experience.
• Experience with both client- and server-side development for responsive messaging.
• Caching systems expertise; experience with Redis will make you a standout candidate.
• Expert knowledge of quality testing practices.

About Us

NinjaOne unifies IT to simplify work for nearly 40,000 customers in 140+ countries.

The NinjaOne Unified IT Operations Platform delivers endpoint management, autonomous patching, backup, and remote access in a single console to improve efficiency, increase resilience, and reduce spend. By automating IT and managing all endpoints, organizations give employees a great technology experience at work. NinjaOne is obsessed with customer success and has retained a 98% customer satisfaction score for more than 5 years.

What you'll love

• We are a collaborative, kind, and curious community.
• We honor your flexibility needs with full-time work that is hybrid remote.
• We have you covered with our comprehensive benefits package, which includes medical, dental, and vision insurance.
• We help you prepare for your financial future with our 401(k) plan.
• We prioritize your work-life balance with our unlimited PTO.
• We reward your work with opportunity for growth and advancement.

Additional Information

This position is NOT eligible for Visa sponsorship. Due to federal government security requirements associated with our FedRAMP-authorized environment, candidates must be U.S. citizens or lawful permanent residents.

*Due to operational policies, NinjaOne is unable to hire for this role within the city limits of Chicago. We will consider all qualified candidates who reside outside of the city proper or are willing to self-relocate.

Starting pay for the successful applicant depends on a variety of job-related factors, including but not limited to location, market demands, experience, job-related knowledge, and skills. The benefits available for this position include medical, dental, vision, 401(k) plan, life insurance coverage, and PTO. For roles based in California, Colorado, Maryland, New Jersey, or Washington the base salary hiring range for this position is $1600,000 to $200,000 per year.

For roles based in New York, the base salary hiring range for this position is $160,000 to $200,000 per year.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, marital status, veteran status, or any other status protected by applicable law. We are committed to providing an inclusive and diverse work environment.