5 days ago Be among the first 25 applicants This range is provided by Underdog.io. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more. Base pay range $165,000.00/yr - $230,000.00/yr Senior Full-Stack Engineer – AI-Powered Voice Technology Founded in 2014, Underdog.io is the 2nd largest US-based hiring marketplace for tech and product talent. With over 650 hiring partners in pre-seed, seed, and series A-C looking to hire full-time skilled engineers, data, and product professionals. One of our hiring partners founded in 2024 recently received 5M in seed funding and is looking to add a Founding Engineer. About the Role We’re building the future of AI-driven voice technology, and we need a Senior Full-Stack Engineer to architect and ship high-impact features that directly shape our product and revenue. You’ll work at the intersection of cutting-edge AI, scalable infrastructure, and customer-facing applications—owning projects from 0→1 prototyping to 1→n scaling. This is a high-leverage role where you’ll collaborate with top AI researchers, optimize large-scale audio data pipelines, and deploy real-time ML models that redefine how users interact with voice technology. If you thrive in fast-moving, early-stage environments and want to build foundational AI infrastructure, we’d love to hear from you. What You’ll Do Build end-to-end, full-stack features that directly impact customers and revenue. Solve high-stakes audio AI challenges, from scalable data pipelines to real-time ML model deployment. Drive technical decisions at the frontier of AI, working alongside world-class researchers. Own and architect solutions from 0→1 prototyping to 1→n scaling, shaping our core product and infrastructure. Technical Challenges You’ll Tackle Architect and ship customer-facing full-stack features that enable rapid iteration. Design scalable engineering solutions for processing and analyzing terabytes of audio data. Optimize data pipelines for large-scale audio dataset generation and quality control. Develop and deploy audio-focused ML/LLM models, from research to production. Who You Are 3+ years as a senior full-stack engineer with startup experience (1-2 years at an early-stage or high-growth startup). Proven track record of shipping end-to-end features that drive revenue and user impact. Leadership presence—able to mentor junior engineers and drive technical discussions. Exceptional at breaking down complex problems and communicating system designs. Technical skills: Frontend: Next.js, TypeScript, TailwindCSS Experience (or strong interest) in audio AI, signal processing, or ML deployment Ideal Background CS degree from a top 25 university (or equivalent experience). Startup-minded—you thrive in ambiguity and move fast. Passion for voice technology, AI, and building from the ground up. Startup-minded builders. Why Join? Work on bleeding-edge AI with a world-class team. Build foundational infrastructure for a category-defining product. Competitive compensation, equity, and the chance to shape the future of voice tech. Seniority level Seniority level Mid-Senior level Employment type Employment type Full-time Job function Job function Information Technology Industries Software Development Referrals increase your chances of interviewing at Underdog.io by 2x Get notified about new Full Stack Engineer jobs in San Francisco Bay Area . San Francisco, CA $160,000.00-$180,000.00 3 days ago San Francisco, CA $40,000.00-$70,000.00 2 weeks ago San Francisco, CA $130,000.00-$238,000.00 2 weeks ago San Francisco, CA $220,000.00-$350,000.00 2 weeks ago San Francisco, CA $145,000.00-$230,000.00 7 hours ago Software Engineer, AI Intern (Fall 2025) San Francisco Bay Area $57.00-$61.00 2 weeks ago Software Engineer, AI Platform - New Grad Full Stack Software Engineer - Post-training Mountain View, CA $125,400.00-$188,100.00 2 weeks ago Software Engineer, Frontend (All Levels) San Francisco, CA $150,000.00-$220,000.00 2 weeks ago San Jose, CA $130,000.00-$180,000.00 2 weeks ago Software Engineer (L4), Content & Business Products San Francisco, CA $130,000.00-$220,000.00 3 days ago San Francisco, CA $130,000.00-$185,000.00 1 month ago San Francisco, CA $165,000.00-$165,000.00 2 years ago Full Stack Software Engineer (L4), Product Localization Engineering San Francisco, CA $40.00-$40.00 3 days ago San Francisco, CA $40.00-$40.00 3 days ago Palo Alto, CA $152,400.00-$228,700.00 2 weeks ago San Francisco, CA $130,000.00-$140,000.00 2 weeks ago San Francisco, CA $125,000.00-$175,000.00 3 weeks ago San Francisco, CA $120,000.00-$190,000.00 8 months ago New Grads 2025 - Software Engineer, Algorithm San Jose, CA $120,000.00-$165,000.00 9 months ago We’re unlocking community knowledge in a new way. Experts add insights directly into each article, started with the help of AI. #J-18808-Ljbffr Underdog.io
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