KSoftware Engineer · Dhaka

Buildingwith purpose.

I'm Khaled Md Saifullah, a backend and full-stack developer who enjoys turning complex ideas into simple, reliable products.

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Good software should feel simple.

I care about

Quality · Clarity · Reliability

Let's build
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What I work with

Skills & tools

A practical toolkit built around backend development, full-stack products, databases, and the infrastructure needed to run them.

01

Backend

Building APIs and application logic with a focus on clarity and reliability.

JavaScriptNode.jsExpressNext.jsGo
02

Frontend

Creating practical interfaces that stay fast, responsive, and easy to use.

ReactNext.jsTypeScriptTailwind CSSSCSSHTMLCSS
03

Cloud & DevOps

Working across deployment, automation, containers, and production infrastructure.

LinuxBashAWSDockerCI/CDJenkinsVPS Server
04

Databases

Designing and working with application data across relational and document databases.

MongoDBPostgreSQLMySQLRedis
Career log

Experience

  1. 2025 — 2026

    Project Manager, FSD @ Scaleup Ads Agency

    • Led a team of 65+ engineers (Full Stack and Mobile) to deliver scalable software solutions, ensuring KPI growth from $0 to $50K+ revenue.
    • Deployed and managed applications on AWS (EC2) and VPS servers with focus on scalability, security and uptime.
    • Built and maintained backend systems for web and mobile applications with emphasis on performance and reliability.
    • Ensured end-to-end project delivery including testing, deployment and client handover with high satisfaction.
    Node.jsPostgreSQLDockerAWSProject Management

  2. 2024 - 2025

    Bankend Developer @ Scaleup Ads Agency

    • Develop and handle backend services with the MERN stack (MongoDB, Express, React, and Node.js) for web and mobile apps.
    • Develop and enhance database queries and schemas to provide high performance data operations.
    Node.jsNext.jsMongoDBRedis
Selected work

Projects

Writing

Blogs

Sep 30, 2026

A Framework for System Design Interviews

Learn a simple 4-step framework for system design interviews. Understand requirements, design architecture, explore components and handle scalability with practical examples.

#system design#software development

Sep 27, 2026

Back of the Envelope Estimation | Guide for System Design Interviews

Learn how back-of-the-envelope estimation helps you quickly estimate QPS, storage, latency, availability and scalability requirements in system design interviews with a simple real world example.

#System Design#System Design Interview#Scalability

Sep 9, 2026

Understanding Amazon Route 53 | Essential AWS DNS Concepts Explained

Learn Amazon Route 53 from beginner to intermediate level and understand how AWS DNS works behind the scenes. This guide covers hosted zones, DNS records, Alias records, nameservers, TTL and how Route 53 works with services like EC2, Application Load Balancer.

#AWS Route 53#Route 53 DNS#AWS DNS service

Aug 17, 2026

AWS Load Balancing and Auto Scaling Group(ASG)

Learn how AWS Load Balancers and Auto Scaling Groups work together to build highly available, scalable, and resilient applications. This guide explains load balancing, AWS load balancer types, Auto Scaling Groups, scaling policies, health checks, and real-world architecture with practic

#aws#asg#alb#nlb
Get in touch

Let's build something

Have a project, role, or idea in mind? Send a message and I'll get back to you directly at my inbox.