Senior Software Engineer - Full Stack (Python) & AI

Job Description

Experience Levels:

• Mid Level - 2 to 4+ years experince
• Senior: 5–7 years of relevant experience.
• Lead/Principal: 8+ years, with a history of mentoring or architecting complex systems.
  
  

Company Overview

At Fulfil, we’re redefining how high-growth merchants operate in a complex omnichannel world. Founded on the belief that business operations should be seamless and scalable, we’ve built a unified platform that transforms back-office challenges into growth opportunities—powering everything from order management to financial systems. Trusted by global brands like The Ridge, Hexclad, and Mejuri (and serving merchants akin to India’s Flipkart and Nykaa), we’re driving the future of e-commerce and wholesale at scale.

Headquartered in the USA and Canada, with a vibrant engineering hub in Bangalore, Fulfil is where ambitious problem-solvers come to push boundaries, master their craft, and collaborate on mission-critical technology that impacts millions.

Role: Senior Software Engineer As a Senior Software Engineer at Fulfil, you’ll design and build the next-generation systems that power millions of customer orders and financial transactions for some of the world’s fastest-growing merchants. Our Python-based platform handles massive scale—think millions of transactions per hour—and your work will ensure it’s robust, scalable, and maintainable.

You’ll collaborate with a global team across the USA, Canada, and Bangalore, tackling sophisticated challenges in an environment that values clean code, innovative design, and collective problem-solving.

What You’ll Do

• Own the Full Stack: Take charge of our entire Python-based platform—from front-end integrations to back-end systems—maintaining and scaling a codebase of millions of lines that powers global commerce.
• Ship Features Fast: Drive the rapid design, development, and deployment of new features, delivering value to high-growth merchants at breakneck speed.
• Integrate AI: Build and embed AI-driven capabilities into our ERP, enhancing automation and intelligence for order management, financials, and beyond.
• Master Scale and Stability: Optimize REST and GraphQL APIs (600+ endpoints), microservices, and Kubernetes/Docker deployments to handle millions of transactions with zero downtime.
• Elevate Code Quality: Refactor legacy systems, write testable code with pytest, and collaborate on peer reviews to keep our stack robust and maintainable.
• Bridge Ecosystems: Integrate seamlessly with e-commerce platforms (Shopify, Amazon) and logistics partners (FedEx, DHL), ensuring our merchants’ operations hum.
• Solve at Scale: Tackle the real-world challenges of a B2B SaaS leader—think complex business logic, reusable components, and global infrastructure management.
  
  

Job requirements

What You Bring

• Experience building large-scale server-side applications and microservices with Python.
• Expertise with ORMs (e.g., SQLAlchemy, Django) and SQL databases (Postgres preferred).
• Proficiency in our stack: Python, Celery, Postgres, Redis, RabbitMQ.
• Hands-on experience with testing (pytest) and Git for version control.
• A track record of delivering scalable, maintainable code with a focus on ownership—leading projects from design to deployment.
  
  

Bonus Points

• Experience scaling systems at a high-growth tech company.
• Familiarity with cloud platforms (Google Cloud, Heroku, etc.).
• Passion for optimizing distributed systems or e-commerce workflows.