00 — HelloAlexandria, Egypt

Hi, I’m Abdelrahman.

I build the systems behind the experience.

I’m a software engineer with a backend focus. I design and maintain APIs, untangle slow data flows and modernize legacy code — and because I also ship Angular features, I build with the screen on the other side in mind.

Explore my work View my résumé

Fig. 01 — the markAAbdelrahmanOthe experience people seethe system at its centre

Focus: Backend, with full-stack experience
Built: 50+ RESTful APIs in production
Now: Make It Simple, UK · since Aug 2022Make It Simple, UK
Open to: Remote roles, or relocating

00 — At a glance

What I build, and with what.

The short version. The chapters below show where each of these was used.

a
APIs & backend services
RESTful APIs for production SaaS, including 50+ for Octopaye’s core workflows.
- Node.js
- TypeScript
- Express
- NestJS
b
Data & performance
MongoDB access that holds up: only the fields needed, paged or batched reads, filtering done in the query.
- MongoDB
- Mongoose
- MySQL
- Sequelize
c
Frontend features
Angular features built on top of my own APIs, from the endpoint to the screen.
- Angular
- TypeScript
- HTML
- CSS / SCSS
d
Cloud, real-time & CMS
AWS on the way to microservices, Socket.io for real-time, Strapi as a headless CMS.
- AWS
- Socket.io
- Strapi

Languages: JavaScript · TypeScript · Java · Python
Backend: Node.js · Express · NestJS · Spring Boot · Strapi · Socket.io
Databases: MongoDB · Mongoose · MySQL · Sequelize
Frontend: Angular · HTML · CSS / SCSS · Bootstrap
API engineering: RESTful APIs · Authentication & authorization · Performance optimization · Refactoring
Architecture: Microservices · Event-driven architecture · SOLID · Design patterns
Cloud & DevOps: AWS Lambda · EC2 · S3 · SQS · Fargate · CloudWatch · Jenkins · Linux
Testing: Unit testing · Integration testing
Tools & practices: Git · GitHub · GitLab · Jira · Agile

Everything from my CV — not a claim that each was used on every project.Everything from my CV — not every tool on every project.

Chapter 01

The journey, so far.

From a computer science degree in Minufiya to production SaaS work for a UK company — each step added a layer to how I build.From a computer science degree in Minufiya to production SaaS work for a UK company.

2016–20
2016 – 2020 · Education
Education · the starting point
Bachelor in Computer Science
Faculty of Computers and Information, Minufiya University
2021
Apr – Jul 2021 · Education
Education · Apr – Jul 2021
MEARN Stack Diploma
Information Technology Institute (ITI) — MongoDB, Express, Angular, React and Node.js: most of the stack I went on to build with.Information Technology Institute (ITI)
2021
Sep 2021 – Aug 2022
2021
Sep 2021 – Aug 2022 · Alexandria
Role · Alexandria, Egypt
Backend Developer
Blue Holding
My first engineering role, on the backend only: event, healthcare-booking and real-time products plus internal business systems, built mostly with Node.js, Express and Strapi.My first engineering role, on the backend only: event, healthcare-booking and real-time products plus internal systems, mostly with Node.js, Express and Strapi.
- Events
- Healthcare booking
- Real-time
- Internal tools
- Events
- Healthcare booking
- Real-time
- Internal tools
- Eventeck — backend for a multi-portal event platform for attendees, organizers and exhibitors, with payments through Strapi. Live streaming was next when the project was paused.
- TCP-Jeddah — the backend for a simple appointment platform that helps people quit smoking by finding specialized clinics and doctors.
- Pfizer Flip — the backend for an engaging flip-card game, with real-time communication over Socket.io: my first time using it in a real product.
- Internal systems — an IT support ticket system and an HR system.
- Eventeck — multi-portal event platform; payments through Strapi. Paused before live streaming was built.
- TCP-Jeddah — a simple appointment platform for smoking-cessation clinics and doctors.
- Pfizer Flip — a flip-card game; my first real product with Socket.io.
- An IT support ticket system and an HR system.
2022
Aug 2022 – present
2022
Aug 2022 – present · UK, remote
Role · UK, remote
Software Engineer backend / full stack
Make It Simple
At this software house my work has centred on Octopaye, a payroll product: adding new features and rebuilding older ones. I design and maintain APIs, fix performance problems at their source and deliver features through to Angular.Octopaye, a payroll product: new features, and rebuilding the older ones. I design and maintain APIs, fix performance problems at their source and deliver through to Angular.
- 50+ RESTful APIs
- Performance
- Legacy modernization
- End-to-end delivery
- Microservices & AWS
- 50+ RESTful APIs
- Performance
- Legacy modernization
- End to end
- Designed, developed and maintain 50+ RESTful APIs with Node.js, Express, MongoDB and Mongoose for core workflows of a production SaaS platform.
- Diagnosed recurring performance and timeout issues caused by processes retrieving excessively large datasets from MongoDB.
- Redesigned data-retrieval and processing flows to avoid unnecessary full-dataset loading, improving responsiveness and stability and reducing timeout- and crash-prone workflows.
- Refactored legacy APIs and backend modules, and contribute to modernizing legacy components while keeping production workflows compatible.
- Deliver features end to end across backend services and Angular applications, with QA and other engineering teams.
- Part of the shift from a monolith (hosted on EC2, with S3 for file storage and downloads) toward microservices, with hands-on exposure to SQS, Lambda, Fargate and CloudWatch.
- 50+ RESTful APIs with Node.js, Express, MongoDB and Mongoose for core workflows.
- Resolved recurring timeouts caused by excessively large MongoDB reads by redesigning retrieval and processing flows.
- Refactored legacy APIs and modules; modernizing while keeping production workflows compatible.
- Features across backend services and Angular, with QA and other engineering teams.
- Part of the shift from an EC2-hosted monolith toward microservices: SQS, Lambda, Fargate, CloudWatch.

Chapter 02

Selected work.

Four products across two companies. The illustrations are conceptual — drawn from what each product does, not screenshots.Illustrations are conceptual — drawn from what each product does, not screenshots.

02.1 — Make It Simple · payroll SaaS02.1 — Make It Simple · UK, remote2022 →

Octopaye payroll SaaS

50+RESTful APIs · one mark eachAPIs · one mark each

Conceptual illustration

A payroll product built by Make It Simple. Our job was to add new features and to rebuild and enhance the older ones, so most of my work has been building and refactoring, from APIs to Angular screens.A payroll product built by Make It Simple. We added new features and rebuilt older ones, so most of my work has been building and refactoring, from APIs to Angular.

Detail: Stopped crashing exports, reports and list screens by fetching only the needed fields, paging or batching data, and filtering inside MongoDB queries.
Detail: Refactored legacy APIs and modules while keeping existing production workflows compatible.
Detail: Worked through the move from a monolith on EC2 toward microservices, using SQS, Lambda, Fargate and CloudWatch.
Stack: Node.js · Express · MongoDB · Mongoose · Angular · AWS

Detail: stopped crashing exports, reports and list screens by fetching only needed fields, paging or batching, and filtering in MongoDB.

Node.js · Express · MongoDB · Mongoose · Angular · AWS

Read the project story

02.2 — Blue Holding · 2021–2202.2 — Blue Holding2021–22

Eventeck

Conceptual illustration

An event platform with separate portals for attendees, organizers and exhibitors. It was paused before launch.

My part: backend work across the platform, including payments through Strapi. Live streaming was the next piece when the team moved on to other projects.backend work, including payments through Strapi. Live streaming was next when the project was paused.

Node.js · Express · Strapi

Three audiences, one backend. Attendees, organizers and exhibitors each had their own portal on top of shared backend functionality.
Payments through Strapi. The headless CMS handled payments. Live streaming was planned, but not built before the project was paused.

Three audiences on shared backend functionality.
Node.js · Express · Strapi.

02.3 — Blue Holding · 2021–2202.3 — Blue Holding2021–22

TCP-Jeddah

Conceptual illustration

A simple appointment platform that helps people quit smoking: find a specialized clinic or doctor, then book a visit.

My part: I developed the backend — the part that makes clinics and doctors findable and turns a choice into a booked appointment.I developed the backend — discovery of clinics and doctors, and appointment booking.

Node.js · Express · Strapi

Two jobs in one backend: discovery (specialized clinics and doctors) and appointment booking.
Kept deliberately simple. Strapi as a headless CMS on Node.js and Express covered what an appointment platform of this size needed.

Two jobs in one backend: discovery and booking.
Node.js · Express · Strapi as a headless CMS.

02.4 — Blue Holding · 2021–2202.4 — Blue Holding2021–22

Pfizer Flip

An engaging flip-card game, played in real time.

My part: the backend and its real-time communication. It was my first time using Socket.io in a real product.the backend and real-time communication, my first time using Socket.io in a real product.

Node.js · Express · Socket.io · Strapi

Real-time over request/response. Socket.io keeps a live connection so updates reach connected clients as they happen.
A first, in production. My first real product with Socket.io, alongside Express and Strapi.

Conceptual illustration

Also at Blue Holdingan IT support ticket system and an HR system. — an IT support ticket system and an HR system.

Chapter 03

How I work.

Five habits, each one tied back to something I’ve actually done.

01
I investigate production problems down to their cause.
At Make It Simple I’ve worked through issues across services, APIs, database operations and workflows — including crashing exports and reports traced to oversized MongoDB reads. I find problems through user complaints and logs, and I report the bugs I catch while working on other tickets.Found through user complaints, logs and bugs I catch while working other tickets — including crashing exports traced to oversized MongoDB reads.
02
I make existing systems more dependable.
CSV and PDF exports, report data and list screens that used to crash stopped crashing once they fetched only the fields they needed, paged or batched their reads, and filtered inside MongoDB.Exports, reports and list screens that used to crash stopped crashing after I reworked how they read data.
03
I simplify legacy code without breaking what depends on it.
Refactoring legacy APIs and modules, and modernizing older components while keeping production workflows compatible.Refactoring legacy APIs and modules while keeping production workflows compatible.
04
I build the backend with the frontend in mind.
I deliver features end to end, across backend services and Angular applications — so I see how every endpoint gets used.Features delivered end to end, across backend services and Angular.
05
I work the whole path to production.
Collaborating with QA and other engineering teams through development, testing and delivery.With QA and other engineering teams, from development through testing to delivery.

Chapter 04 — Say hello

Let’s build something useful.

Or email me directly

aerosama793@gmail.com

I’m based in Alexandria and open to remote roles or relocating.Based in Alexandria, open to remote roles or relocating.

I build the systems behind the experience.

What I build, and with what.

APIs & backend services

Data & performance

Frontend features

Cloud, real-time & CMS

The journey, so far.

Bachelor in Computer Science

MEARN Stack Diploma

Backend Developer

Software Engineer backend / full stack

Selected work.

Octopaye payroll SaaS

Eventeck

TCP-Jeddah

Pfizer Flip

How I work.

Let’s build something useful.

Send me a message

Abdelrahman Osama — CV