Back End Developer

6 days ago

Islamabad, Islamabad, Pakistan baa89318-481c-44a8-8b21-e800ad02e042 Full time 1,200,000 - 3,600,000 per year

Role Overview

You'll build backend services, tools, and function integrations that power our AI agents—especially OpenAI tool/function calling, message webhooks, and data pipelines. You'll own services from design → implementation → deployment → observability, and collaborate closely with our AI/agent and frontend teams.

What You'll Do


• LLM & Tools

o Design and implement OpenAI function/tool schemas (TypeBox/JSON) for agent actions (order tracking, returns/exchanges, product search, ticketing, courier selection, etc.).

o Build tool runtimes and guardrails (timeouts, retries, circuit breakers, input/output validation, JSON coercion).

o Implement prompt/runtime orchestration (system prompts, user context injection, tool selection logic, audit logs, token cost tracking).


• Platform Integrations

o Own Meta Graph/WhatsApp Cloud API webhooks (messages, reactions, comments), Instagram/Messenger subscriptions, thread control.

o Ship Shopify Admin & Storefront GraphQL integrations (orders, carts, products, discounts, abandoned carts).

o Integrate email (Gmail/Outlook) and voice (LiveKit Agents / SIP over WebRTC) where needed.


• Data & Infra

o Design MongoDB schemas and composite/TTL indexes, add archiving strategies, and create analytics/aggregation pipelines.

o Build queues/workers (Redis/Bull) for async jobs (webhook ingestion, enrichment, syncs).

o Add observability (structured logs, metrics, tracing) and SLOs; implement alerts on latency, error rates, and queue depth.


• Reliability & Security

o Harden APIs with authN/authZ, rate limits, idempotency keys, and signed webhooks.

o Own CI/CD pipelines, containerization, and zero-downtime deploys on GCP.


• Developer Experience

o Create internal SDKs/clients, codegen for tool schemas, and example recipes/playbooks for adding new agent tools fast.

Tech You'll Use (day-to-day)


• (TypeScript), FeathersJS v5, app routes for thin APIs when needed


• MongoDB (Atlas + local), Redis/Bull, Nginx, GCP (VMs, storage), Docker


• OpenAI APIs (function/tool calling, embeddings), Pinecone (or similar vectordb)


• Shopify GraphQL Admin, Meta Graph/WhatsApp Cloud API, Gmail/Outlook


• LiveKit Agents / WebRTC (nice-to-have), Webhooks at scale


• Cursor / Claude / Aider etc


• Testing: Vitest/Jest, supertest; Linting/Types; GitHub Actions

Requirements


• 3–6+ years building production backend services in


• Strong with API design, async job processing, and data modeling for MongoDB.


• Experience with LLM integrations (OpenAI) and JSON function/tool schemas.


• Comfortable with webhooks, OAuth, signed requests, retries, and idempotency.


• Solid testing habits, observability mindset, and performance tuning (indexes, memory, slow queries).


• Security basics: secret management, token scopes, least privilege, input validation.

Nice-to-Have


• FeathersJS v5, Multi-tenant SaaS patterns, RBAC


• Shopify Admin GraphQL apps, discount codes, order edits, abandoned carts


• Meta Graph API, WhatsApp Cloud API message types and media


• LiveKit/WebRTC/SIP bridges; voice AI pipelines


• Vector DBs (Pinecone/pgvector), semantic search indexing pipelines

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