Usama Amjid is a software engineer specializing in backend and distributed systems. He builds the systems behind fintech apps, marketplaces, and AI products — APIs, payments, real-time features, and background jobs — and works full-stack when a product needs it. He has been building production systems since October 2023.

What does Usama Amjid build?

Usama builds backend and full-stack systems across fintech, marketplaces, cybersecurity, loyalty, and AI. His work includes a multi-country digital wallet, an API-first payments product (Payment Way), a peer-to-peer car-rental marketplace he built end to end, a cybersecurity analytics backend, and AI agents built with LangGraph.

What technologies does Usama Amjid use?

His core stack is Node.js, TypeScript, and Deno, with PostgreSQL, MongoDB, Redis, and Elasticsearch for data; BullMQ, AWS SQS/SNS, and Socket.IO for async and real-time; and LangGraph/LangChain for AI agents. He also builds frontends with Next.js and React.

Is Usama Amjid a backend or full-stack engineer?

Backend and distributed systems are his depth, but he is full-stack in practice — he has shipped Next.js websites, mobile apps, and AI agents end to end, including both the backend and the frontend of products he owns.

Is Usama Amjid available for work?

Yes. He is open to strong engineering roles and to building products with clients. He is based in Pakistan and works across time zones, with overlap for Europe and North America.

How much experience does Usama Amjid have?

He has been building production software since October 2023 — roughly three years — across fintech, marketplaces, cybersecurity, loyalty platforms, and AI, as a primary author on multiple backend systems.

Open to roles & selective projects

Software EngineerBackend & Distributed Systems

I build the backend systems behind fintech apps, marketplaces, and AI products — and the full-stack and AI pieces when a product needs them.

View my work Get in touch Download CV

focus·Fintech·Marketplaces·AI Agents·Security

usama.ts

const usama = {
  role: "Backend & Distributed Systems",
  builds: ["fintech", "marketplaces", "AI agents"],
  stack: ["Node", "TypeScript", "Deno"],
  data: ["Postgres", "Mongo", "Redis"],
  alsoShips: ["Next.js", "mobile"],
  caresAbout: "correctness",
};

// 01

selected work

A few of the systems I've built and shipped.

Systems I've built and shipped.

Fintechcompany work

Stable

A digital wallet and neobank used across several countries — accounts, transfers, cash-in/out, cards, and KYC, plus a business side for merchants.

Core backend engineer. Built the authentication platform, a login security layer, the notification service, and a campaign engine; connected regional payment providers. On the business side I built Payment Way end to end — an API-first way for outside businesses to plug in (backend, merchant dashboard, and developer docs).

Node.jsTypeScriptMongoDBRedisBullMQAWSNext.js

Marketplaceown product

Car-Rental Marketplace

A peer-to-peer car-rental marketplace — hosts list vehicles, guests book them, with live chat and real-time booking updates.

Built entirely on my own — backend and website. Raw-SQL PostgreSQL data layer, real-time chat/presence/booking status, and background jobs. My clearest proof of full-stack ownership.

Node.jsTypeScriptPostgreSQLRedisSocket.IONext.js 15React 19

Agentic AIown product

content-agent

An AI agent that plans, writes, and schedules social posts on its own, then posts to multiple platforms.

Built solo: a LangGraph state-machine agent (intent → plan → validate → execute) with a registry of tools, peak-time scheduling, and vector search.

TypeScriptLangGraphLangChainMongoDBRedisBullMQVector search

Cybersecuritycompany work

Cybersecurity Analytics Backend

A multi-tenant platform that ingests alerts from several security tools and turns them into risk reports teams can act on.

Major author. Built the alert-ingestion pipelines and background workers, per-organization usage limits, and multi-language risk reporting.

Node.jsExpressMongoDBElasticsearchBullMQRedisAWS

SaaScompany work

Product-Review Platform

A product-review and discovery platform — products, brands, reviews, and the search and ranking behind the feed.

Dominant author. Built the product/brand/review APIs and the search, sorting, and ranking, over a dual MongoDB + PostgreSQL data layer.

TypeScriptExpressMongoDBPostgreSQLFirebaseSocket.IO

View all projects

// 02

about

Who's behind the work.

I'm Usama, a software engineer who works mostly on the backend — the part of an app people never see but always feel: the APIs, payments, real-time updates, and background jobs that have to stay correct and fast, even when something breaks.

The backend is my depth, but I build the whole thing when a product needs it. I've shipped Next.js websites, mobile apps, and AI agents that actually do work instead of just answering questions. For the last three years I've built fintech systems, marketplaces, and security tooling — most of it running across several countries.

I care about getting the hard parts right: money that always adds up, systems that recover on their own, and code the next person can actually read. I've also trained and mentored two developers. I'm open to strong engineering roles and to building products with people who want it done properly.

how I work

I get the hard parts right

Money that reconciles, jobs that retry themselves, and clear error paths — not happy-path code.

I build for things going wrong

Retries, fallbacks, and no duplicate charges when a request repeats. Systems should recover on their own.

I write for the next engineer

Readable code, real documentation, and standards a team can follow. I led our move to TypeScript.

I build end to end

Backend, the website, and the documentation a client needs to actually use it.

I use AI well

As a builder (real AI agents) and in how I work — shipping faster with prompt engineering.

// 03

experience

Roles, and what I built in each.

What I've built, and where.

Software Engineer — Backend · Stable

Backend engineer on a digital wallet used across several countries.

Oct 2025 — Present

Remote

Built the app's login and account system from the ground up — one-time-password sign-in, multiple devices per user, and the checks that keep bots and fake accounts out.
Built Payment Way, a product that lets outside businesses plug into the wallet through a clean API — I built the backend, the dashboard they use, and the developer documentation that explains it.
Built a security layer for login that spots and blocks automated abuse and account-guessing attacks, with rules the team can adjust live without shipping new code.
Built and led the notification service behind every email, SMS, push, and WhatsApp message — with automatic retries and fallbacks so a message still goes out when one provider fails.
Built the campaign engine that sends large batches of messages with start/pause/stop controls and daily sending limits.
Connected the platform to regional payment providers so money moves reliably even under load or repeated requests.
Helped move the codebase to TypeScript to make it safer and easier for the whole team to work in.

Node.jsTypeScriptMongoDBRedisBullMQAWS SQS/SNSSocket.IONext.js

Software Engineer — Backend · Anemoia

Backend engineer building products across cybersecurity, fintech, loyalty, and AI.

Oct 2023 — Oct 2025

Pakistan

Built the backend for a cybersecurity product that pulls in alerts from several security tools and turns them into risk reports teams can act on (multi-tenant, multi-language).
Built an AI agent (LangGraph) that plans, writes, and schedules content on its own — an autonomous agent with a tool registry and vector search.
Built the backend for a product-review platform — the products, brands, reviews, and the search and ranking behind the feed.
Built a loyalty-and-rewards platform that serves many businesses at once, each with their own setup, points, and rewards.
Built an identity-verification and wallet service that checks IDs and selfies and moves money safely (built on Deno).
Trained and mentored two developers.

Node.jsTypeScriptDenoMongoDBPostgreSQLElasticsearchRedisBullMQDocker

// 04

products

Things I've built for myself, end to end.

My own products.

Marketplaceown product

Car-Rental Marketplace

A peer-to-peer car-rental marketplace — hosts list vehicles, guests book them, with live chat and real-time booking updates.

Built entirely on my own — backend and website. Raw-SQL PostgreSQL data layer, real-time chat/presence/booking status, and background jobs. My clearest proof of full-stack ownership.

Node.jsTypeScriptPostgreSQLRedisSocket.IONext.js 15React 19

Agentic AIown product

content-agent

An AI agent that plans, writes, and schedules social posts on its own, then posts to multiple platforms.

Built solo: a LangGraph state-machine agent (intent → plan → validate → execute) with a registry of tools, peak-time scheduling, and vector search.

TypeScriptLangGraphLangChainMongoDBRedisBullMQVector search

Mobile / AIown product

vaultiq

A mobile app that cleans up your photo gallery using on-device AI.

Built solo — a Flutter app with local storage.

FlutterDart

Mobileown product

pdf_tools

A mobile PDF toolkit — merge, compress, and convert PDFs.

Built solo — a Flutter app.

FlutterDart

// 05

tech

The tools I reach for.

Tech I work with.

Languages & runtimes: TypeScriptJavaScriptNode.jsDenoPythonDart
Backend: ExpressFastifyOakgRPCEvent-driven architectureMicroservices
Data: MongoDBPostgreSQLRedisElasticsearchFirebaseVector search
Async & real-time: BullMQAWS SQSAWS SNSSocket.IOCron pipelines
AI & agentic: LangGraphLangChainOpenAIGeminiTool registriesRAG / embeddings
Cloud & infra: AWSCloudflare R2Docker
Frontend: Next.jsReactTanStack QueryZodTailwind CSS

// 06

writing

Notes on backend, systems & AI.

Writing.

Building Autonomous AI Agents: Memory Systems Guide

autonomous ai agentsagentic memory

Feb 6, 2026

10 min

Building Autonomous AI Agents: Memory Systems Guide

Build autonomous AI agents with memory systems. Learn agentic memory types, architecture patterns, and functional TypeScript implementations for real workflows

Read article

Defend Your Node.js API: Stop AI Bots, Ddos & Cost Attacks

Node.js securityAPI protection

Feb 4, 2026

15 min

Defend Your Node.js API: Stop AI Bots, Ddos & Cost Attacks

Protect Node.js backends from AI-powered bots, credential stuffing, and cost spike attacks. Practical rate limiting, behavior tracking, and defense strategies.

MongoDB Optimization: 10 Proven Techniques for Node.js APIs

Master MongoDB optimization for Node.js with proven indexing, aggregation, and caching strategies. Boost query performance by 10x in high-traffic applications

Read article

View all articles

// 07

contact

Let's talk.

Let's work together.

Have a role, a project, or a system that needs building the right way? Send a message — I read every one and reply personally.

usama@usamaamjid.com