Principal Fullstack Engineer (Backend focus)

👉 IMPORTANT: Upload your resume as a PDF. Resumes in other formats (e.g., DOC or DOCX) will be automatically disqualified by our AI systemsAbout GrowthX AIAt GrowthX, we design growth systems that integrate AI automation and expert guidance to help marketing teams with content creation, distribution, and conversion. Since our founding in 2024, we’ve hit seven-figure annual revenue in just five months, grown by double digits month-over-month, and teamed up with incredible partners like Reddit, Ramp, and HeyGen to drive their growth.Our approach combines:Advanced AI Workflows: Automating and optimizing growth processes—from content creation to distribution—so clients can scale efficiently.Expert Insights: Pairing AI-driven solutions with human expertise to ensure nuanced, high-quality outputs.End-to-End Solutions: Covering the entire growth funnel, from lead generation to conversion optimization.We go beyond software; we become our clients’ growth partners by leveraging technology, strategy, and hands-on execution.About the roleWe are now seeking a Staff or Principal level Backend Engineer (Runtime & APIs) with extensive experience. This role focuses on frameworks and APIs that enable the efficient development of AI-powered workflows and scalable systems. The ideal candidate thrives on solving complex challenges and delivering pragmatic, high-impact solutions.Being an AI-native company, we expect every team member to embrace AI to boost productivity. Familiarity with tools like Cursor or Windsurf is important.This is a fully remote role, but we do ask for at least 4 hours of overlap with US Pacific Time—during reasonable work hours.RequirementsWhat You'll DoDesign and Build Scalable Backends: Develop backend systems and APIs using TypeScript, Ruby on Rails or Python, to support complex AI workflows and internal platforms. Relational database experience is a must.Develop Runtime and Frameworks: Build and maintain internal runtime systems and frameworks that streamline the creation and execution of AI workflows (currently using Temporal.io)Optimize Performance: Ensure backend systems are performant and scalable to handle high loads and complex data pipelines.Integrate Services and APIs: Create APIs that integrate with a variety of resources, such as Weaviate (for RAG), LLM providers, Scrapers, and external service APIs.DevOps and Infrastructure: Deploy and maintain infrastructure to support backend systems, ensuring reliability and uptime.Collaborate Cross-Functionally: Work closely with product engineers, and services team to deliver cohesive, high-quality solutions.Pragmatic Problem-Solving: Focus on delivering impactful solutions without over-engineering, ensuring timely and effective outcomes.Write AI Workflows: all technical members of our team help with creation and maintenance of AI Workflows that our Services team uses (this is also a way to dogfood our workflows runtime and APIs).About YouWe’re looking for someone with:Proven Backend Expertise: Strong experience in building and scaling backend systems using PostgreSQL, TypeScript, Ruby on Rails or Python.Platform Development Experience: Familiarity with building internal platforms, frameworks, or runtimes to support efficient software development.API: Expertise in designing, implementing, and maintaining APIs that connect diverse systems and services.DevOps Savvy: Proficiency in deploying, monitoring, and maintaining production systems with a focus on reliability and scalability.Performance Aware: A deep understanding of performance optimization techniques for databases and backend services.Problem-Solving Mindset: A pragmatic approach to solving complex problems with impactful, actionable solutions. This role is more suited for someone who thrives in complex environment, but is still pragmatic and can make the right calls for when to build something from scratch and when to use something off the shelf.Strong Collaboration Skills: Ability to work effectively with cross-functional teams in a remote environment.Excellent Communication: Clear and proactive communication skills, essential for coordinating with team members and stakeholders.LLM/RAG Knowledge (Bonus): Familiarity with building for LLMs, RAG, and related technologies is a strong plus. Interesting in going deep on these subjects is a requirement.Perks:🌍 Fully Remote WorkWork from anywhere—your productivity, your space!We help set up your work environment to enable your best work.Minimal meetings and async communication for deep focus🏖 Ample Time OffEnablement for you to recognize your countries holidaysWe encourage you to take the time you need to recharge!📚 Professional GrowthWe’re an AI forward culture and work environment - Learn all things AI!Access to training, workshops & mentorship programsSupport for external conferences & industry events🤝 Collaborative CultureOpen communication & feedback-driven environment.Clear, concise communication is key to our success.Work Visa: Applicants must have legal authorization to work in the country of residence. We are not able to provide employment visa sponsorship at this time.Compensation Range: $200K - $250K