Freelance Full Stack Java Developer Jobs in Minnesota

Be a part of our mission! As a world leader in creating comfortable, sustainable, and efficient climate solutions for buildings, homes and transportation, it's our responsibility to put the planet first. For us at Trane Technologies, and through our businesses including TraneandThermo King, sustainability is not just how we do business-it is our business. Do you dare to look at the world's challenges and see impactful possibilities? Do you want to contribute to making a better future? If the answer is yes, we invite you to consider joining us in boldly challenging what's possible for a sustainable world.

Learn about our benefits designed for you to Thrive at work and at home.

We boldly go.

Where is the work:

What's in it for you:

Be a part of our mission! A sustainable future demands ongoing digital advancement. Our digital solutions team leads the way in developing next-generation climate technology focused on reducing demand-side energy consumption and emissions. Across our brands-including BrainBox AI, Nuvolo, Thermo King, Trane, and more-our teams combine deep technical expertise with advanced analytics to create data-driven solutions that add real value for customers, communities, and the planet.

We invest in tomorrow's possibilities-and in our people-by providing ongoing learning, mentorship, and opportunities to work with industry-leading technology. Whether you're advancing AI in HVAC or driving analytics for greater efficiency, your ideas will help engineer solutions for stronger communities and a sustainable world.

What you will do:

Thermo King is seeking a highly experienced Senior Full Stack Developer with proven expertise in backend development using Java and Spring Boot within the Microsoft Azure ecosystem, coupled with advanced frontend development skills using Next.js. You will design, develop, and optimize cutting-edge web and mobile solutions supporting our connected product ecosystem. In this key role, you'll architect scalable, secure microservices on Azure with Spring Boot and Java, build exceptional user experiences with Next.js, and advance our cloud-native IoT platform.

What you will bring:

• Minimum 8 years of hands-on backend development experience, including significant work with Java and Spring Boot in Microsoft Azure environments.
• Proven ability to design, develop, and maintain scalable backend systems and APIs using Java Spring Boot and Azure technologies.
• Significant experience building production-grade frontend applications using Next.js and the React ecosystem.
• Demonstrated track record architecting distributed, multi-tenant microservices solutions.
• Advanced development skills in backend technologies, with a strong focus on Java and Spring Boot.
• Proven experience building and deploying RESTful and Graph APIs with Java Spring Boot, integrated with Azure services.
• Expertise in Azure Functions, Azure App Services, Azure API Management, Azure SQL, Cosmos DB, Azure Storage, Azure Logic Apps, and related cloud-native services.
• Deep understanding of identity management and authentication using Azure AD B2C and OAuth flows.
• Experience with serverless computing, event-driven architecture, and message-based systems (Event Grid, Service Bus).
• Familiarity with both relational (Azure SQL) and non-relational (Cosmos DB, MongoDB) databases.
• Strong understanding of containerization (Docker) and orchestration (Kubernetes on Azure Kubernetes Service - AKS).
• Familiarity with CI/CD pipelines, DevOps practices, and Azure DevOps tools (Azure Pipelines, GitHub Actions).
• Advanced skills in developing modern web applications with Next.js, React, and TypeScript.
• Strong focus on building responsive, accessible, and performant user interfaces.
• Experience integrating frontend applications with Azure-hosted and Java Spring Boot backend APIs and services.
• Skilled in implementing secure authentication flows, including Single Sign-On and token-based authentication.
• Experience implementing multitenant SaaS architectures: tenant isolation, scalability, data partitioning.
• Working knowledge of networking concepts and cloud infrastructure best practices.
• Deep expertise in Microsoft Azure compute, storage, networking, security, monitoring, and cost optimization.
• Experience developing, deploying, and scaling applications in Azure cloud environments.
• Knowledge of cloud-native application patterns and Azure resource management.
• Familiarity with Infrastructure-as-Code tools (ARM templates, Bicep, Terraform for Azure).
• Strong understanding of Azure security best practices, identity, and access management.
• Familiarity with regulatory compliance (GDPR, HIPAA, etc.) using Azure services and secure coding practices.
• Demonstrated ability to monitor, analyze, and optimize Azure-based backend performance, especially for Java/Spring Boot services.
• Skilled at diagnosing and resolving bottlenecks for reliable, high-availability systems.
• Experience building and scaling IoT applications leveraging Azure IoT suite (IoT Hub, Device Provisioning, Time Series Insights).
• Familiarity with modern UI/UX design collaboration and tools (Figma, Sketch, etc.).
• Exposure to billing/subscription management for SaaS and implementing secure user authentication/authorization flows.
• Microsoft Certified: Azure Solutions Architect, Azure Developer Associate, or relevant Azure certifications.
• Oracle Certified Professional: Java, or equivalent Java/Spring Boot certifications.

Annual Base Salary Range or Hourly Base Pay Range:

Compensation Type:

Incentive Eligible:

Sales Commission Eligible:

Disclaimer: We strive to provide competitive compensation for this position, tailored to a variety of factors. The actual compensation will depend on elements such as seniority, merit, geographic location, education, experience, travel requirements, and union designation. Our compensation range is generally based on the national average for the country. Additionally, benefits may vary depending on the region, business alignment, union involvement, and employee status.

Thrive at work and at home:

• Benefits kick in on DAY ONE for you and your family, including health insurance and holistic wellness programs that include generous incentives - WE DARE TO CARE!

• Family building benefits include fertility coverage and adoption/surrogacy assistance.

• 401K match up to 6%, plus an additional 2% core contribution = up to 8% company contribution.

• Paid time off includes 15 vacation days, 9 paid holidays, 3 floating holidays, sick leave, and additional options to support volunteer and parental leave.

• Educational and training opportunities through company programs along with tuition assistance and student debt support.

Disclaimer: Benefit offerings may vary depending on Collective Barraging Agreements and local/state regulations.

Safety Sensitive Role:

The company designates certain roles as Safety Sensitive. Safety Sensitive roles may require that you pass additional drug screening.

We offer competitive compensation and comprehensive benefits and programs. We are an equal opportunity employer; all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, pregnancy, age, marital status, disability, status as a protected veteran, or any legally protected status.