Staff Fullstack Engineer

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 ImpactYou 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 successBuild and evolve the backend services that power our Conversation Intelligence PlatformExpand the capabilities and use cases supported by our APIsImprove scalability, reliability, and performance across core systemsEstablish strong architectural foundations for long-term growthAccelerate Modulate's ability to serve both enterprise and developer customersWhat You'll DoCollaborate with engineers and product leaders to scope, design, and deliver new platform capabilitiesDesign, build, test, and deploy backend services and APIs that power customer-facing productsBuild frontend functionality where needed to create seamless end-to-end product experiencesMaintain and operate production systems to ensure reliability, scalability, and performanceDebug complex production issues and continuously improve system stabilityContribute to architecture decisions and engineering best practicesMentor teammates through code reviews, design discussions, and technical leadershipWhat We're Looking ForStrong experience with object-oriented PythonExperience designing and building production-grade APIs and backend systemsFullstack engineering experience, with a clear strength and passion for backend developmentExperience building greenfield products and scaling existing production systemsStrong understanding of system architecture, scalability, and distributed systemsProven ability to collaborate effectively across engineering teamsExperience shipping products from concept to productionNice to HaveExperience with cloud infrastructure and containerized environmentsExperience working alongside ML or AI teamsExperience with React or other modern frontend frameworksExperience building developer platforms or enterprise productsBenefitsAt Modulate, we prioritize people and sustainability—because doing great work requires feeling supported and safe.Some of our key benefits include:Competitive salary + equityFull health, dental, and vision coverageFlexible PTO, with a strong culture of taking itWeekly team lunches with dietary accommodationsHybrid work: core in-office days with flexible remote optionsRegular leadership and industry learning sessionsSupport for career development and continued learningUp to 8 weeks work-from-anywhere policyA deeply inclusive, human-centered culturePay TransparencyModulate believes in transparency as a cornerstone of equity and trust. Compensation for this role is based on seniority, skills, and experience.Salary: $180,000-$200,000Equity: OfferedOther Perks: HSA, FSA, 15 company holidays, professional growth resourcesAbout ModulateModulate 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.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.