# Back-End Engineer

Paraline Tech builds back ends in NestJS, Node.js and Laravel on PostgreSQL: APIs, data models, background jobs and the integrations a product depends on.

- **Provider:** Paraline Tech
- **Page:** https://paralinetech.com/expertise/backend-engineer

## What this covers

- REST APIs and server-side business logic
- PostgreSQL schema design, migrations and row-level security
- Authentication, single sign-on and role-based access
- Queues and background jobs
- Payment, CRM, courier and SMS integrations
- Multi-tenant data separation
- File storage and media pipelines
- LLM gateways and AI back ends

## Tools

NestJS, Node.js, Laravel, PostgreSQL, Prisma, Redis, BullMQ, Supabase, FastAPI

## Work that shows it

- [GoEx: Courier Operations Platform](https://paralinetech.com/work/goex): Shipment tracking and operations platform for a Pakistani courier, built from scratch: admin, merchant and rider apps. COD from day one, city-to-city zone pricing, local SMS, bulk and single booking, rider PWA for budget Android phones.
- [Volnyn: AI Website Builder & LLM Gateway](https://paralinetech.com/work/volnyn): Multi-provider LLM platform that generates and live-previews websites via SSE streaming, then deploys each one to its own volnyn.app subdomain. Freemium quotas, tiered plans, Gemini/OpenAI routing by tier.
- [My Expense Flow: Expense Splitting App](https://paralinetech.com/work/my-expense-flow): Ad-free expense splitter with groups, live shared balances and unequal splits (exact, percentage, shares).
- [Volnynx: MCP Integration for a Freelance Marketplace](https://paralinetech.com/work/volnynx-mcp): Remote HTTP MCP endpoint that lets AI assistants act on a Laravel marketplace, with no client package required.
- [Metabull: SSO for a Knowledge Base](https://paralinetech.com/work/metabull-sso): OAuth single sign-on between Wiki.js and a Django identity provider.
- [Teachora.ai: Lecture & Substitution Management](https://paralinetech.com/work/teachora): Multi-campus lecture and teacher-substitution management for schools. When a teacher is on leave, Teachora builds the cover board and assigns free teachers within fair workload limits.

## Where the experience comes from

- 2023–25: **Lobovo.** Senior full stack on Medlucy, a healthcare platform.
- 2025–: **Metabull AI.** Senior full stack: FastAPI, Node.js, Next.js, Stripe.

## Common questions

**What does a back-end engineer do?**

A back-end engineer builds what runs on the server: the database, the API, the business rules, background jobs and integrations with other systems. It is the part users do not see but every screen depends on.

**Which back-end technologies does Paraline Tech use?**

NestJS and Node.js in TypeScript, Laravel in PHP, and PostgreSQL as the database, with Prisma, Redis and BullMQ where a project needs them.

**Can Paraline Tech build only the API for an existing front end?**

Yes. The back end can be built on its own, to an agreed API contract, for a front end or mobile app that another team owns.