Software Developer Contract Jobs in Lees Summit, MO

About the role

We are looking for a Senior Full Stack Software Engineer to join our Emerging Products team. This role is primarily backend-focused Java/Kotlin, with working proficiency in React/Javascript. You'll work closely with our data platform and reporting teams, as well as product designers and product owners, to build new products from the ground up.

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, ME, MA, NJ, NC, NY, OR, TN, TX, VA, OH and WA. We have physical offices in Austin, TX and Tampa, FL, if you prefer a hybrid option.

** Onsite interviews may be required for this role.**

What You'll Be Doing

• Design and build the API and serving layer that powers data-intensive product experiences, using REST and/or GraphQL APIs to efficiently expose data, insights, and analytics to applications.
• Develop highly scalable backend services using Java and Kotlin, with a focus on API-first architecture, performance, reliability, and extensibility.
• Build new data-driven product experiences that transform large volumes of operational and analytical data into actionable insights, scoring, dashboards, and customer workflows.
• Design and optimize data access patterns across APIs, relational databases, caching layers, and analytical data sources to support enterprise-scale workloads.
• Build and maintain React/TypeScript user experiences, including dashboards, forms, workflows, status indicators, and drill-down experiences, while contributing to reusable components and established frontend architecture and data-flow patterns.
• Establish clear and maintainable contracts and boundaries between frontend applications, APIs, and backend services.
• Participate in architecture and design reviews as we take new products from early-stage development through general availability and enterprise scale.
• Identify and solve performance and scalability bottlenecks across backend services, APIs, databases, data access patterns, and front-end applications.
• Troubleshoot complex production issues across the full technical stack using logs, metrics, traces, query analysis, browser debugging, and other observability tools.
• Instrument front-end applications with appropriate observability and telemetry to understand errors, performance, and customer experience in production.
• Leverage AI-assisted development tools and techniques to improve engineering productivity and accelerate product development.
• Participate in code reviews, document technical decisions and processes, and contribute to cross-team engineering initiatives.
• Take ownership of features end-to-end—from architecture and implementation through testing, deployment, monitoring, and production troubleshooting.
• Other duties as needed.

About You

• Bachelor's degree in Computer Science, Computer Engineering, Information Technology, or equivalent work experience.
• 10+ years of software development experience building production applications, with strong experience in Java. Kotlin experience is a plus but not required.
• 4+ years of experience working with highly scalable software systems.
• Strong understanding of OOP design principles, data structures, and object-oriented design.
• Knowledge of API best practices and experience developing REST / GraphQL services. gRPC experience is a plus.
• Comfortable writing, analyzing, and troubleshooting SQL with experience in relational database design and development.
• Expert knowledge of software quality and testing practices, including unit, integration, API, and front-end testing.
• 2+ years of experience with React and modern front-end application development.
• Strong TypeScript/JavaScript fundamentals, including using TypeScript to establish maintainable, reusable contracts and clear boundaries across components, APIs, and application layers.
• Strong understanding of HTML, CSS, browser fundamentals, and accessibility, beyond simply working within a React framework.
• Experience building reusable React components and working within established front-end architectures and data-flow patterns.
• Ability to debug and troubleshoot front-end issues, including rendering, network, state-management, and browser-related problems.
• Strong written and verbal communication skills.
• Experience leveraging AI tooling to accelerate software development.

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

• A collaborative, kind, and curious community.
• Flexibility with full-time hybrid remote work.
• Comprehensive benefits package: medical, dental, and vision insurance.
• 401(k) plan to help you prepare for your financial future.
• Unlimited PTO to support your work-life balance.
• Opportunities for growth and advancement.

Additional Information

This position is NOT eligible for Visa sponsorship.

*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 depends on a variety of job-related factors, including but not limited to location, market demands, experience, job-related knowledge, and skills. For roles based in California, Colorado, New Jersey, New York, or Washington, the base salary hiring range for this position is $150,000 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.