Principal Fullstack Engineer

1 day ago

Lahore, Punjab, Pakistan Stafflink Full time 1,200,000 - 3,600,000 per year

About the Role

We are looking for a highly experienced
Principal Fullstack Engineer
to lead the design and development of a scalable, high-performance SaaS platform. This role requires strong expertise in both
backend , Fastify, TypeScript, MongoDB)
and
frontend (React, TypeScript, modern UI frameworks)
development. You will architect complex systems that power real-time communication, geolocation queries, analytics, and user-facing web applications, ensuring seamless experiences across the stack.

As a Principal Engineer, you'll play a critical role in
defining system architecture, mentoring engineers, and driving technical decision-making
for the platform's evolution.

Key Responsibilities

Backend Engineering

  • Design and implement scalable APIs using
    Fastify 5.x, , and TypeScript
  • Develop real-time features with
    WebSockets/Socket.IO
  • Build advanced services, including:
  • Geolocation-powered service discovery
  • Real-time wait time comparison APIs
  • Queue management and appointment scheduling engines
  • Smart recommendation systems (ML-powered)
  • Ensure platform security: authentication (JWT, OAuth, Apple/Google sign-in), rate-limiting, and middleware
  • Optimize MongoDB queries, indexing, and geospatial features

Frontend Engineering

  • Build and maintain user-facing web applications with
    React (TypeScript, Hooks, Context API/Redux)
  • Create intuitive, responsive, and high-performance UIs for queue management, scheduling, and analytics dashboards
  • Integrate real-time updates via WebSockets and state management
  • Implement modern design systems and component libraries for consistent UX
  • Collaborate with designers to transform complex workflows into clean, usable interfaces

Leadership & Architecture

  • Drive end-to-end technical architecture decisions for a fullstack SaaS platform
  • Collaborate with product and business teams to translate requirements into scalable solutions
  • Mentor and guide mid-level and senior engineers across backend and frontend teams
  • Establish best practices for coding standards, CI/CD, testing, and security

Tech Stack

Backend

  • , Fastify 5, TypeScript
  • MongoDB, Mongoose, Redis
  • WebSockets, Socket.IO
  • Docker, PM2, Bull Queue
  • Prometheus, Grafana, Winston

Frontend

  • React (TypeScript, Hooks, Context API/Redux)
  • (nice to have)
  • TailwindCSS / Material UI / Chakra UI
  • WebSockets for real-time UI updates
  • Testing: Jest, React Testing Library

Requirements

Must Have

  • 7+ years of professional software development experience
  • Proven expertise with
    , TypeScript, MongoDB, and React
  • Strong experience building
    scalable, real-time, and data-intensive systems
  • Hands-on experience with
    authentication, authorization, and security best practices
  • Experience designing and deploying
    complex SaaS architectures
  • Strong communication skills in English

Nice to Have

  • Experience with Fastify framework
  • Background in geospatial algorithms or GIS systems
  • Exposure to microservices and distributed systems
  • Familiarity with DevOps (Docker, Kubernetes, CI/CD pipelines)
  • Knowledge of ML concepts for recommendation engines

What We Offer

  • Technical challenges
    : Real-time communication, geolocation algorithms, scalable architectures, ML-powered recommendation engines
  • Growth opportunity
    : Lead technical decision-making and mentor engineering teams
  • Work environment
    : Flexible hours, remote/hybrid options, modern dev setup
  • Impact
    : Build mission-critical systems that handle high traffic and deliver seamless customer experiences

If you're a
seasoned fullstack engineer
who thrives in solving complex challenges and leading technical innovation, we'd love to hear from you

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