Principal Fullstack Engineer (Backend focus)

GrowthX AI; United States; Remote; USD 90,000 - 150,000; Full time

Job summary

Join a cutting-edge AI-native company as a Staff or Principal Backend Engineer, where you'll design and build scalable backend systems that power innovative AI workflows. In this fully remote role, you will collaborate with cross-functional teams, leveraging your expertise in TypeScript, Ruby on Rails, and Python to create high-impact solutions. You'll enjoy a culture that prioritizes professional growth, ample time off, and a collaborative environment. This is an exciting opportunity to work with advanced AI technologies and contribute to a rapidly growing company that values your input and creativity.

Benefits

Fully Remote Work

Ample Time Off

Professional Growth

Collaborative Culture

Qualifications

• Extensive backend development experience with a focus on scalable systems.
• Strong understanding of API design and integration with various services.

Responsibilities

• Design and build scalable backends and APIs for AI workflows.
• Optimize backend performance to handle high loads and complex data.

Skills

Backend Development

API Design

TypeScript

Ruby on Rails

Python

PostgreSQL

DevOps

Performance Optimization

Problem-Solving

Collaboration

Education

Bachelor's Degree in Computer Science or related field

Tools

Temporal.io

Job description

IMPORTANT: Upload your resume as a PDF. Resumes in other formats (e.g., DOC or DOCX) will be automatically disqualified by our AI systems

About GrowthX AI

At 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 role

We 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.

Requirements

What You'll Do

• Design 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 You

We’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 Work

• Work 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 Off

• Enablement for you to recognize your countries holidays

• We encourage you to take the time you need to recharge!

Professional Growth

• We’re an AI forward culture and work environment - Learn all things AI!

• Access to training, workshops & mentorship programs

• Support for external conferences & industry events

Collaborative Culture

• Open 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.

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