hassan@dev: ~/portfolio

Hassan Zameer

Available for remote Pakistan (open globally) 6+ yrs · Founding Eng.
./view_work ./contact_me

about_me

Founding engineer.
Full-stack owner.

I'm a senior full-stack engineer who builds entire products — not isolated features. From zero-to-live SaaS, I've owned the architecture, infrastructure, backend, frontend, and the team that ships it all.

As a founding engineer at Jobz, I took a job-matching platform from scratch to the App Store and Play Store — personally building the AI matching engine, Elasticsearch relevance layer, credit billing system, and AWS infrastructure.

I work best at the intersection of product thinking and engineering precision — where decisions have real consequences and clean code isn't optional.

Open to senior remote roles with high ownership and hard technical problems.

6+

yrs in production

0→1

founding eng. SaaS

AI

matching & LLMs

∞

scale-first mindset

experience.log

Where I've shipped

Jobz

Senior Full-Stack Engineer — Founding Team

Jan 2024 – Present · New York (Remote)

● LIVE
  • Founding engineer — took the product from zero to live on Apple App Store & Google Play
  • Built the core AI matching engine using OpenAI/LLMs for intelligent candidate-job ranking
  • Engineered Elasticsearch search system with relevance tuning at concurrent scale
  • Owned full auth: OAuth 2.0, JWT, Devise, RBAC across web and mobile
  • Designed Stripe credit-based billing — plan management, usage metering, renewals
  • Ran full AWS infra: PostgreSQL clusters, Sidekiq jobs, backups, horizontal scaling
  • Feature flags, analytics dashboards, product iteration from real user feedback
  • Grew and mentored a team of 3–5 engineers
RailsReactNext.js React NativeTypeScriptTailwindCSS ElasticsearchSidekiqRedis DockerKubernetesAWS StripeOpenAI

Devsinc

Senior Software Engineer

Aug 2021 – Jan 2024 · US Clients (Remote)

  • Delivered multiple SaaS products end-to-end for US clients across different verticals
  • Built full observability stack: OpenTelemetry, Prometheus, Grafana
  • Designed multi-tenant RBAC and workflow automation systems
  • Managed Kubernetes infra, cluster migrations, high-availability tuning
  • Scaled Stripe billing across multiple platforms — thousands of concurrent transactions/month
  • Shopify API integrations, React dashboards, CI/CD with AWS and Docker, RSpec/BDD
  • Implemented feature flags and A/B testing frameworks
RailsReactNode.js KubernetesAWSStripe Shopify APIPrometheusGrafana OpenTelemetryRSpec

ERSTECH

Software Engineer

Jan 2021 – Aug 2021

  • Built Rails applications with JS/jQuery; grew test coverage ~25% via RSpec, Cucumber, Jest
  • Optimized RESTful APIs with PostgreSQL/MySQL, object caching, and query tuning
RailsJavaScript PostgreSQLMySQL RSpecCucumber

WorldCall Telecom

Software Engineer

Jan 2019 – Sep 2020

  • Built responsive web and mobile UIs in Rails, React, React Native
  • Integrated third-party APIs and SDKs; adopted Git workflows and Agile sprints
RailsReact React NativeGit

tech_stack.json

Tools of the trade

Backend

Ruby on Rails
Node.js
Python
PostgreSQL
MySQL
Redis
Sidekiq

Frontend & Mobile

React
Next.js
TypeScript
TailwindCSS
React Native

AI & Search

OpenAI / LLMs
Elasticsearch
AI Matching Systems

Infrastructure & DevOps

AWS
Kubernetes
Docker
Prometheus
Grafana
OpenTelemetry

Auth & Payments

Stripe
OAuth 2.0
JWT
Devise
RBAC

featured_projects

Things I've built

● LIVE

Jobz — AI Job Matching SaaS

Founding Engineer · 2024–Present · New York

Took the product from zero to live SaaS — App Store and Google Play. Built the AI matching engine (OpenAI/LLMs), Elasticsearch relevance layer, Stripe credit billing, full OAuth/RBAC auth stack, and AWS infrastructure end-to-end. Reported directly to the CEO.

Rails · React · Next.js React Native OpenAI LLMs Elasticsearch Stripe · K8s · AWS
SHIPPED

ImageRelay — Digital Asset Management

Full-Stack Engineer · Devsinc client

Built features across a comprehensive DAM platform — asset storage, templates, product collections, and creative workflow tooling. Enabled teams to design templates, manage product assets, and curate campaign collections from a single unified interface.

Ruby on Rails Stimulus.js Asset pipelines Template engine
SHIPPED

Powur — Solar Sales Platform

Full-Stack Engineer · Devsinc client

Built features for a solar power marketplace connecting homeowners with certified vendors. Clients can generate custom savings proposals, select from a vetted vendor network, and visualise solar panel placement using the NearMap satellite API — all from their browser.

Ruby on Rails GraphQL NearMap API Savings proposals
SHIPPED

Aymes Medical — Nutrition Platform

Backend Engineer · Canadian healthcare client

Built backend systems for a Canadian medical nutrition company specialising in shakes and supplements tailored to specific dietary needs. Delivered product management, user health-profile matching, and order workflows for clinicians and direct consumers.

Python Django Healthcare domain Product workflows
SYSTEM

Enterprise Asset Management System

Architect · Full-stack ownership

Designed and built a multi-tenant asset tracking platform for enterprise clients — asset registration, lifecycle management, assignment workflows, audit trails, and role-based access. Architected for high-volume inventory with real-time status tracking and exportable reporting.

Rails · PostgreSQL Multi-tenancy Audit trails RBAC Real-time tracking

More projects & open source
coming soon

$ cat contact.txt

Open to the right
remote opportunity

I'm looking for senior engineering roles with real ownership — product-shaping work, not ticket grinding. If you're building something hard, let's talk.

./email_me ./linkedin →