Senior Fullstack Engineer

Full Stack Engineer (LLM/AI) At Tech9, we’re driven by a clear mission—to empower organizations with AI-centered solutions that make them more adaptable, efficient, and future-ready. As a company at the forefront of innovation, we help clients build exceptional software that not only meets today’s needs but anticipates tomorrow’s challenges. Our partnerships with clients like Instructure, Young Living, Imagine Learning, and Mars Corp. reflect our commitment to delivering top-tier, scalable, and world-class software. With offices across the U.S., LATAM, and India, Tech9 is creating an environment where talented individuals thrive, collaborate, and have fun while building transformative solutions. If you’re looking to grow in a fast-paced, innovative environment where your work truly matters, we’d love to hear from you. Project Overview We’re working with a company that builds AI-powered training simulations to help people improve real-world skills like leadership, communication, and decision-making. Their platform is used by organizations in education, healthcare, and business to create safe, realistic environments where employees can practice important human skills. To power these simulations, the company combines real-time audio/video, digital avatars, and AI, all running on a fast-moving backend infrastructure. That’s where this role comes in. Role Overview We’re seeking a Full Stack Engineer with LLM/AI experience and 6+ years of backend development (80% in either NestJS/Python/ or Java) with some work on the frontend (20%) using JavaScript. Key Responsibilities Develop, maintain, and optimize backend services using NestJS and TypeScript Building systems that make it easy to deploy, monitor, and scale AI features Support frontend components using ReactJS as needed (approx. 20% of the role). Contribute to the migration of backend services from Java to NestJS. Collaborate with product and design teams to translate requirements into reliable technical solutions. Ensure code quality through peer reviews, testing, and adherence to best practices. Work with Azure and AWS cloud environments to deploy, monitor, and maintain applications. Participate in agile ceremonies (daily standups, sprint reviews, retrospectives). Troubleshoot, debug, and improve system performance. Minimum Requirements 6+ years of professional software development experience in Java/TypeScript/ or Python LLM experience Experience working with cloud services (Azure preferred; AWS a plus) Strong understanding of software design principles, REST APIs, and modular architecture. Excellent communication skills and ability to work collaboratively in a cross-functional team. Nice to Have Experience integrating AI tools or APIs into software workflows. Familiarity with containerization (Docker, Kubernetes). Interest in mentoring or sharing knowledge within the team. Interview Process Our process is designed to be fast, transparent, and candidate-friendly. Screening Interview (HireVue) – 30 mins Recruiter Q&A – 10 mins Informal chat to cover details and answer questions. Round 1: Live Technical Interview – 60 mins Focused on hands-on coding in TypeScript / NestJS. Client Interviews (2 Rounds) – 90 mins total Assess technical expertise, communication, and client fit. Total Time Investment: 3.5–4 hoursWe aim to complete all interviews within 2–3 weeks and extend an offer shortly after. Seniority level Mid-Senior level Employment type Full-time Job function Engineering and Information Technology Industries Software Development Referrals increase your chances of interviewing at Tech9 by 2x #J-18808-Ljbffr