Back End Developer

ZocialOne is an AI-powered Growth Marketing platform. One platform to create, post, schedule, reply, and analyze across 7 social media platforms — Facebook, Instagram, YouTube, LinkedIn, Pinterest, Threads, and Google Business Profile. This is a live production system used daily by 150,000+ businesses. Every API you write, every schema you design, and every bug you fix directly impacts real users, real data, and real revenue. We are looking for a Backend Engineer who wants to build production systems that matter — real APIs, real databases, real users. You join as the second backend engineer, working directly with the backend lead. Your code runs in production from week one. This is not a shadow role — you are here to build.

What You'll Do

• Build and maintain REST APIs (Express.js) consumed by web, mobile (Flutter), and our AI agent (Zoe)
• Design and evolve PostgreSQL schemas with TypeORM — users, posts, analytics, subscriptions, billing
• Integrate 7 social media platform APIs — each with its own OAuth, rate limits, webhooks, and failure modes
• Build payment and subscription systems (Razorpay) — plan enforcement, credit tracking, invoice generation
• Implement background job processing (pg-boss) — scheduled posting, analytics aggregation, notification delivery, retry logic
• Build real-time features with WebSockets (Socket.IO) — live notifications, SSE bridges, chat events
• Handle media processing pipelines — image/video uploads to GCS/S3, FFmpeg transcoding, aspect ratio handling
• Implement authentication flows — Firebase Auth, JWT, Google Sign-In, phone OTP, WhatsApp login
• Build the API bridge between ZocialOne and Zoe AI — content generation endpoints, credit tracking, prompt management
• Monitor, debug, and hotfix production issues — Sentry error tracking, Winston logging, production incident response

What You'll Need

• Node.js with TypeScript — production-grade, not tutorial-level
• Express.js — routing, middleware, request validation (Zod / express-validator)
• PostgreSQL + TypeORM — JOINs, indexes, migrations, constraints, transactions
• REST API design — proper validation, pagination, filtering, error handling, versioning
• Async programming — Promises, async/await, event loop, race conditions
• Error handling — try/catch as muscle memory, graceful degradation, structured error responses
• Git — branch, commit, review, merge, resolve conflicts

Nice to have:

• Firebase Admin SDK
• Razorpay / payment gateway experience
• Cloud storage (GCS, S3)
• WebSockets / Socket.IO
• Job queues (pg-boss, Bull)
• FFmpeg / media processing
• Docker, CI/CD
• Sentry, monitoring tools
• Social media API experience
• Basic exposure to AI APIs (Gemini, OpenAI)

Who You Are

• Reliable — when you say it ships Thursday, it ships Thursday
• Detail-oriented — a wrong number in analytics or a duplicate charge is unacceptable to you
• Fundamentally strong — you understand how databases, HTTP, and async code actually work
• Independent — you take a task end-to-end without needing step-by-step hand-holding
• Production-minded — you think about what breaks at scale, not just what works in local
• Persistent — some days you're tracing a timezone bug in a cron job; you stay until it's fixed

Not a Fit If

• You can't write a SQL JOIN without Googling it
• You treat error handling as optional
• You've never deployed code that real users interact with
• You copy-paste from ChatGPT without understanding what the code does

Compensation

• Competitive Salary aligned with your experience and the market.
• Everything you build goes to production. Not a staging server, not a test project — production. 150,000+ businesses use the APIs you write for their everyday marketing. That's a portfolio most engineers don't build in 5 years.
• You learn at startup speed. In 6 months here, you will touch APIs, databases, payments, social media integrations, background jobs, media processing, AI backends, and production debugging. At a large company, you'd spend that time onboarding to one microservice.
• You work with a senior backend lead who has built this entire system. Direct mentorship. Real code reviews. Not a YouTube tutorial — a production codebase.

Why Join ZocialOne

• Your APIs serve 150,000+ businesses daily — real impact from day one
• You're engineer #2, not #47 — touch every part of the system in your first month
• Backend serves both human users and an AI agent (Zoe) — the future of software engineering
• Direct access to founders and product decisions — no management layers
• Production deployments weekly — your work reaches users in days, not months "Production systems are not built by people who give up when the logs don't make sense."