Staff Fullstack Engineer Somerville, MA Engineering /Full-time /Hybrid Join Modulate as we pioneer the future of conversational intelligence. Modulate is the leader in conversational voice intelligence. We enable platforms and enterprises to deeply understand how people communicate and take timely action based on those insights. Our products help detect harm, prevent fraud, and build safer, more trusted online and real-world voice environments. We are building a self-serve Conversation Intelligence Platform—APIs, workflows, and applications that bring voice understanding to customers at enterprise scale. We're looking for a Staff Fullstack Engineer with a strong backend focus to help build and scale the systems that power our Developer and Enterprise APIs. While you'll work across the stack when needed, the majority of your time will be spent designing, building, and scaling backend services that bring our ML-powered voice technology to customers. Your Impact You will play a critical role in bringing our world-class ML audio models to market through robust, scalable backend systems and APIs. Your work will directly impact both our product velocity and our ability to serve enterprise and developer customers. You will: - Develop and iterate on early-stage products that are key to Modulate's success - Build and evolve the backend services that power our Conversation Intelligence Platform - Expand the capabilities and use cases supported by our APIs - Improve scalability, reliability, and performance across core systems - Establish strong architectural foundations for long-term growth - Accelerate Modulate's ability to serve both enterprise and developer customers What You'll Do - Collaborate with engineers and product leaders to scope, design, and deliver new platform capabilities - Design, build, test, and deploy backend services and APIs that power customer-facing products - Build frontend functionality where needed to create seamless end-to-end product experiences - Maintain and operate production systems to ensure reliability, scalability, and performance - Debug complex production issues and continuously improve system stability - Contribute to architecture decisions and engineering best practices - Mentor teammates through code reviews, design discussions, and technical leadership What We're Looking For - Strong experience with object-oriented Python - Experience designing and building production-grade APIs and backend systems - Fullstack engineering experience, with a clear strength and passion for backend development - Experience building greenfield products and scaling existing production systems - Strong understanding of system architecture, scalability, and distributed systems - Proven ability to collaborate effectively across engineering teams - Experience shipping products from concept to production Nice to Have - Experience with cloud infrastructure and containerized environments - Experience working alongside ML or AI teams - Experience with React or other modern frontend frameworks - Experience building developer platforms or enterprise products Benefits At Modulate, we prioritize people and sustainability—because doing great work requires feeling supported and safe. Some of our key benefits include: - Competitive salary + equity - Full health, dental, and vision coverage - Flexible PTO, with a strong culture of taking it - Weekly team lunches with dietary accommodations - Hybrid work: core in-office days with flexible remote options - Regular leadership and industry learning sessions - Support for career development and continued learning - Up to 8 weeks work-from-anywhere policy - A deeply inclusive, human-centered culture Pay Transparency Modulate believes in transparency as a cornerstone of equity and trust. Compensation for this role is based on seniority, skills, and experience. Salary: $180,000–$200,000 Equity: Offered Other Perks: HSA, FSA, 15 company holidays, professional growth resources About Modulate Modulate is on a mission to make voice a force for good online. Our tools help communities thrive by proactively detecting toxic behavior, protecting user identity, and empowering safety teams. We're trusted by leaders in gaming and beyond—and we're growing fast. We believe great cultures don't just happen. That's why we've built a foundation of intentional systems: from bias-reducing hiring practices to transparent pay to tools that help teams collaborate across communication styles. At Modulate, we treat people like people—and we're building technology that does the same. Ready to join us? Apply today—we'd love to meet you. This version keeps the Fullstack Engineer title while making it immediately obvious that the role is backend-first, which should attract candidates who enjoy working across the stack but primarily want to build APIs, services, and platform infrastructure. $140,000 - $170,000 a year We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.