Senior Backend Engineer - FastAPI

Required Core Tech Stack: We're looking for engineers with hands-on experience across most of the following technologies: Python Backend Development (3+ years) FastAPI (2+ years of production experience required) PostgreSQL MongoDB Redis Docker Celery or equivalent async task queues REST APIs & Microservices AWS/GCP GitLab CI/CD The selected Sr. Backend engineer will ship the backbone that powers 4 million + learners in 64 countries, owning APIs that crunch 1 billion learning events & the AI that supports it with <200 ms latency.

What You'll Do: At LearnTube, we’re pushing the boundaries to revolutionize how the world learns. As a Senior Backend Engineer, your roles and responsibilities will include: Shipping Micro-services – Build FastAPI services that handle ≈ 800 req/s today and will triple within a year (sub-200 ms p95). Power Real-Time Learning – Drive the quiz-scoring & AI-tutor engines that crunch millions of events daily. Design for Scale & Safety – Model data (Postgres, Mongo, Redis, SQS) and craft modular, secure back-end components from scratch. Deploy Globally – Roll out Dockerised services behind NGINX on AWS (EC2, S3, SQS) and GCP (GKE) via Kubernetes. Automate Releases – GitLab CI/CD + blue-green / canary = multiple safe prod deploys each week. Own Reliability – Instrument with Prometheus / Grafana, chase 99.9 % uptime, trim infra spend. Expose Gen-AI at Scale – Publish LLM inference & vector-search endpoints in partnership with the AI team. Ship Fast, Learn Fast – Work with founders, PMs, and designers in weekly ship rooms; take a feature from Figma to prod in < 2 weeks.

What makes you a great fit? Must-Haves (Applicants without these skills are unlikely to move forward): 3+ yrs Python back-end experience (FastAPI) Strong with Docker & container orchestration Hands-on with GitLab CI/CD, AWS (EC2, S3, SQS) or GCP (GKE / Compute) in production SQL/NoSQL (Postgres, MongoDB) + You’ve built systems from scratch & have solid system-design fundamentals

Nice-to-Haves: k8s at scale, Terraform, Experience with AI/ML inference services (LLMs, vector DBs) Observability: Prometheus, Grafana, OpenTelemetry

Why LearnTube? Build AI products at global scale – Your work will power learning experiences for 4M+ learners across 64 countries. Work directly with experienced founders – Collaborate closely with founders who are deeply involved in product and engineering decisions, giving you ownership and a direct impact on the product roadmap. Learn fast – Join a high-performing team where you'll own features end-to-end and solve challenging backend and distributed systems problems. Recognized AI startup – LearnTube is a Google Top 20 AI Startup and part of Google's AI First Startup Accelerator, with access to cutting-edge AI technology and mentorship.

Why Work With Us? At LearnTube, we believe in creating a work environment that’s as transformative as the products we build. Here’s why this role is an incredible opportunity:

Cutting-Edge Technology: You’ll work on state-of-the-art generative AI applications, leveraging the latest advancements in LLMs, multimodal AI, and real-time systems.

Autonomy and Ownership: Experience unparalleled flexibility and independence in a role where you’ll own high-impact projects from ideation to deployment.

Rapid Growth: Accelerate your career by working on impactful projects that pack three years of learning and growth into one.

Founder and Advisor Access: Collaborate directly with founders and industry experts, including the CTO of Inflection AI, to build transformative solutions.

Team Culture: Join a close-knit team of high-performing engineers and innovators, where every voice matters, and Monday morning meetings are something to look forward to.

Mission-Driven Impact: Be part of a company that’s redefining education for millions of learners and making AI accessible to everyone.