Senior Full-Stack Engineer (AI SaaS), Potential Long-Term Role

We are building an AI-powered platform that helps professionals connect with podcast hosts, journalists, PR professionals, and industry experts. The platform uses AI to research relevant contacts, identify the right connections, generate personalized outreach, and help users build valuable professional relationships. Our founder has previously built and successfully sold two businesses in this industry, including a podcast production agency and a podcast discovery database. The initial product has been under development for the past 3–4 months with an external development agency. We are now looking for an experienced Senior Full-Stack Developer to take ownership of the existing codebase, improve the application, fix technical issues, and prepare it for production launch. Responsibilities Take ownership of the existing full-stack application and understand its architecture. Review existing code and identify bugs, performance issues, and areas for improvement. Build and maintain AI-powered workflows using LLMs, databases, and third-party APIs. Develop and improve backend services, APIs, and frontend features. Work with PostgreSQL and ensure reliable database operations. Integrate external APIs and data enrichment services. Improve application performance, stability, and security. Manage deployments and production infrastructure. Test new features and ensure everything works reliably before release. Work independently and turn product requirements into high-quality working features. Required Technical Skills Our current technology stack includes: Next.js React TypeScript Node.js PostgreSQL Supabase Trigger.dev Render Sentry LLMs and AI APIs Third-party API integrations You should have strong experience with most of these technologies and be comfortable working with an existing codebase. What We're Looking For 5+ years of professional full-stack development experience. Strong backend development and database management skills. Solid experience with SQL, PostgreSQL, and API integrations. Experience building and maintaining production-ready SaaS applications. Ability to understand, debug, and improve code written by another development team. Experience working with AI integrations, LLMs, or automated workflows. Strong problem-solving and debugging skills. Ability to work independently and take responsibility for technical decisions. Good communication skills and a proactive approach to work. Bonus Points: Experience building AI-powered SaaS products. Experience with data scraping, data enrichment, or contact discovery. Experience with email automation and personalized outreach systems. Experience with Trigger.dev or similar background job platforms. How We Work You will work directly with the founder, who will provide product direction, requirements, and priorities. You will have ownership of technical decisions and implementation. We prefer developers who can take initiative, identify problems, and suggest better solutions rather than simply waiting for instructions. We keep meetings minimal, typically one call per week, so you can focus on development. Start your proposal with "TIMUNU" to confirm you've read the job post. only Upwork Top Rated, Top Rated Plus, or highly earning freelancers with proven SaaS experience will be considered generic or copy-paste proposals will be rejected.