Full Stack Developer React Js Python Jobs in Belchertown, MA

Full Stack Developer
Web Application Development
Full time, Springfield/Boston
The Opportunity
This role offers the opportunity to build and evolve the digital platforms that support MassMutual's marketing, customer engagement, advisor experience, and business growth objectives. As a Full Stack Developer, you'll work across the entire application stack, designing and delivering modern, scalable web solutions using technologies such as React, Node.js, AWS, and Kubernetes. You'll own features from concept to production, solving complex technical challenges while ensuring applications are secure, performant, reliable, and maintainable.
You'll collaborate closely with product owners, UX designers, architects, and fellow developers to deliver high-quality digital experiences that create measurable business value. This role requires both strong technical expertise and the ability to influence technical direction, lead complex initiatives, and drive engineering best practices. In addition to developing new capabilities, you'll mentor other developers, participate in architecture and code reviews, and help continuously improve our development processes, automation, and delivery pipelines.
Within Marketing Technology, you'll have the opportunity to work on a diverse portfolio of high-visibility websites and digital products while gaining exposure to modern cloud architectures, AI-enabled capabilities, personalization, experimentation, analytics, and large-scale platform modernization efforts. This is an ideal opportunity for a developer who enjoys learning emerging technologies, taking ownership of meaningful work, and helping shape the future of MassMutual's digital ecosystem.
The Team
You'll join a collaborative, globally distributed team of developers based in Springfield, Boston, and India who are passionate about building exceptional digital experiences and supporting one another's success. We foster a culture of ownership, continuous learning, knowledge sharing, and open communication, where team members are encouraged to contribute ideas, challenge assumptions, and help drive technical innovation. The team works closely with product owners, UX and design partners, architects, marketing stakeholders, analytics teams, and risk and compliance partners to deliver secure, high-quality digital solutions that create meaningful business and customer impact.
The Impact
1. Design, develop, and maintain modern web applications
Build and enhance scalable, responsive web applications that directly power potential customer- and advisor-facing digital experiences.
2. Lead the delivery of complex technical features and solutions
Own the technical implementation of features from design through deployment, collaborating with product, design, and architecture teams to deliver high-quality solutions that ensure alignment with business goals and technical standards.
3. Ensure application performance, reliability, and quality
Monitor, troubleshoot, and optimize applications by identifying performance bottlenecks, resolving defects, and implementing observability and monitoring solutions to help maintain a secure, reliable, and seamless experience for potential customers.
4. Champion engineering best practices and continuous delivery
Participate in architecture reviews, code reviews, automated testing, and CI/CD processes to improve software quality and deployment efficiency to help the team deliver features faster, more consistently, and with greater confidence.
5. Mentor and support other developers
Provide technical guidance, coaching, and knowledge sharing to team members, help developers solve problems, estimate work, and grow their skills to grow a culture of continuous learning and collaboration.
6. Collaborate across business and technology teams
Partner closely with product owners, UX designers, architects, marketing stakeholders, analytics teams, and risk and compliance partners to define solutions that meet customer and business needs to ensure we deliver secure, accessible, and impactful digital experiences that drive measurable value for the organization.
The Minimum Qualifications (Required)

• Bachelor's degree in computer engineering, computer science, information systems, or a similar technical field.
• 5+ years of software engineering/development experience.
• 4+ years working on modern front-end JavaScript frameworks.
• 2+ years working in a mature agile environment.
• 1+ years working with AI technologies like Claude or Copilot.

The Ideal Qualifications (Preferred)

• Strong understanding of modern web application architecture, including scalability, performance optimization, security, observability, and maintainability.
• Experience designing and implementing cloud-native solutions, including containerized applications, microservices, and distributed systems.
• Proficiency in modern content management systems.
• Knowledge of modern software engineering practices such as CI/CD, automated testing, infrastructure as code, and DevSecOps principles.
• Experience integrating and optimizing APIs, monitoring platforms, analytics tools, and other third-party services within enterprise applications.
• Ability to troubleshoot complex production issues, identify root causes, and implement sustainable solutions that improve application reliability and user experience.
• Experience evaluating and adopting emerging technologies, frameworks, and development tools to improve team productivity and platform capabilities.
• Experience working with relational and document-based database systems.
• Strong collaboration and communication skills, with the ability to work effectively across technical teams and business partners to achieve shared outcomes.
• Ability to mentor and support other developers through technical leadership, knowledge sharing, and constructive feedback while contributing to a culture of continuous learning and accountability.

What You Can Expect at MassMutual
MassMutual offers the opportunity to do meaningful work within a purpose-driven organization that values long-term impact over short-term outcomes. In this role, you can expect:

• Clear areas of ownership and accountability, with work that connects directly to company and customer outcomes
• A collaborative environment where perspectives are welcomed
• Access to learning, development, and internal networks that support continuous growth and skill-building over time
• Employee-led communities and forums that foster connection, learning, and inclusion across the organization
• A culture grounded in integrity, responsibility, and stewardship-supported by a company with a strong legacy and a future-focused mindset

#LI-RK1
Salary Range:
$128,000-$168,000
At MassMutual, we focus on ensuring fair equitable pay, by providing competitive salaries, along with incentive and bonus opportunities for all employees. Your total compensation package includes either a bonus target or in a sales-focused role a Variable Incentive Compensation component.
Why Join Us.
We've been around since 1851. During our history, we've learned a few things about making sure our customers are our top priority. In order to meet and exceed their expectations, we must have the best people providing the best thinking, products and services. To accomplish this, we celebrate an inclusive, vibrant and diverse culture that encourages growth, openness and opportunities for everyone. A career with MassMutual means you will be part of a strong, stable and ethical business with industry leading pay and benefits. And your voice will always be heard.
We help people secure their future and protect the ones they love. As a company owned by our policyowners, we are defined by mutuality and our vision to put customers first. It's more than our company structure - it's our way of life. We are a company of people protecting people. Our company exists because people are willing to share risk and resources, and rely on each other when it counts. At MassMutual, we Live Mutual.
MassMutual is an equal employment opportunity employer. We welcome all persons to apply.
If you need an accommodation to complete the application process, please contact us and share the specifics of the assistance you need.
At MassMutual, we focus on ensuring fair, equitable pay by providing competitive salaries, along with incentive and bonus opportunities for all employees. Your total compensation package includes either a bonus target or in a sales-focused role a Variable Incentive Compensation component. For more information about our extensive benefits offerings please check out our Total Rewards at a Glance.