Lead Backend Engineer

2 weeks ago


Mumbai, Maharashtra, India BLKBOX Full time

About Blkbox.ai:

Blkbox.ai is transforming digital advertising with AI-driven automation, enabling brands to launch and optimize high-performance campaigns at scale. Our backend systems power cutting-edge machine learning models and cloud-native architectures, helping businesses achieve breakthrough results.

We are looking for a Lead Backend Engineer (SDE-2) with a 60% focus on Python and 40% on Node.js who can own critical backend systems, lead a small team (2+ engineers), and drive high-impact solutions. This is a high-ownership role, requiring a proactive thinker and problem solver—someone who doesn't just execute tasks but ideates, architects, and optimizes solutions. If you thrive in a fast-moving startup environment, have strong leadership abilities, and can deliver measurable impact within 15 days, this role is for you.

Key Responsibilities:

  • Own and lead backend development, focusing on Python (Django/FastAPI/Flask) while integrating Node.js when necessary.
  • Architect & design scalable, high-performance APIs that drive AI-powered automation solutions.
  • Lead and mentor a team of at least 2 engineers, ensuring high-quality development and technical growth.
  • Make independent decisions on system architecture, performance optimization, and scalability.
  • Ensure system reliability and efficiency by optimizing database queries (PostgreSQL/MySQL) and managing distributed systems.
  • Implement and maintain cloud infrastructure using AWS, GCP, or Azure, ensuring best security and cost-efficiency practices.
  • Foster collaboration with cross-functional teams (AI, frontend, product) to align backend solutions with business goals.
  • Drive fast-paced development with minimal guidance, ensuring impactful results are delivered in the earliest stages of your role.

Key Requirements:

  • Minimum of 3 years of experience in backend development within a scaled startup environment.
  • Strong leadership abilities—experience mentoring or leading a small team.
  • Expertise in Python (60%) and Node.js (40%) with hands-on experience building scalable APIs.
  • Deep knowledge of relational databases (PostgreSQL/MySQL) with proven ability to write and optimize complex queries.
  • Proficiency in cloud platforms (AWS, Azure, GCP) for scalable deployments.
  • Solid understanding of microservices, containerization (Docker, Kubernetes), and distributed systems.
  • Excellent communication and problem-solving skills—able to articulate technical concepts and collaborate with teams.
  • Self-motivated and proactive thinker—someone who takes ownership instead of waiting for direction.
  • Ability to deliver high-impact solutions within 15 days of joining.

Good to Have:

  • Experience with Redis, Kafka, RabbitMQ for caching and messaging.
  • Prior experience working on AI-driven applications or AdTech platforms.


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