Ahmed AbdelHalim

Senior Software Developer · DevOps
Berlin, Germany


Senior backend and infrastructure developer with 9+ years experience in development (backend/API focused), 4+ years in infrastructure automation and DevOps, 1+ years Security analysis and Red Team exploit testing. An avid fan of automation, sustainability, design patterns, and clean code. Always interested in deriving a better problem-solving method for challenging tasks, and learning sensible new technologies and tools (if the need arises).


Ansible, Terraform, Docker, Vagrant, Makefile, certbot.
Ruby on Rails, PostgreSQL, Redis, MongoDB, MySQL, Django.
ReactJS, HTML5, Next.js, StimulusJS, TypeScript.
Ruby, Python, Bash, TypeScript, Rust.
Design Patterns, Test Driven Development (TDD), Behavior Driven Development (BDD), Continuous Integration and Delivery (CI/CD), RESTful APIs.
Vim, Git, tmux, ssh, Asana, Atlassian, CircleCI, TravisCI, Terminal, bash, Notion, Sidekiq, ...
nc, nmap, curl, ffuf, gobuster, sqlmap, xxd, searchsploit, meta-sploit, commix, gdb, ltrace, ...
Amazon Web Services (AWS), DigitalOcean, Heroku, Google Cloud Platform (GCP), Linux.
English (Professional), German (Basic), Arabic (Native).

Work Experience

Sapera GmbH.

Senior Developer/DevOps Apr. 2018 - Nov. 2021 Berlin, Germany
  • Implemented infrastructure as code (IaC) for different projects using Terraform and Ansible.
  • Standardized the deployment process (and maintained the process documentation).
  • Built templates to provision infrastructure on different cloud providers and development stages.
  • Built standardized workflows using CircleCI to automate deployments (for internal and external projects).
  • Implemented and maintained the (Rails 5) JSON API serving our infographics portal.
  • Maintained 99+% documentation coverage of the infographics portal API and 90+% test coverage.
  • Worked with Docker to provide deliverables for some of our external projects.
  • Provided support and tutoring to work with our standard deployment workflows (internally and externally).
  • Worked closely with our Systems Engineer to support with various DevOps tasks.
  • Rewrote, maintained and provisioned some of the data pipelines to adhere to a better security standards.


Senior Backend Developer Mar. 2016 - Dec. 2017 Berlin, Germany
  • Maintained the RESTful API (used by admins and front-end).
  • Implemented and maintained the integration with Deutsche Bank.
  • Implemented and maintained the integration with Intercom CRM.
  • Implemented and maintained the Invoicing system.
  • Implemented the new authentication layer using (RFC7519: JWT).
  • Implemented the Two-Factor Authentication (2FA) for user/client login.
  • Integrated other services like DocuSign, PostIdent,...
  • Implemented day to day business/marketing/technical requirements.

PrioriData GmbH.

Full Stack Developer Jul. 2015 - Feb. 2016 Berlin, Germany

Was acquired by Airnow Data Ltd.

  • Maintained the Rails web (dashboard) app.
  • Optimized the scraping process of getting the data from Apple and GooglePlay stores.
  • Reimplemented the queueing and monitoring around the scrapers.
  • Migrated acquired data from different resources to Google BigQuery.
  • Maintained and provisioned different purpose VM instances on Google Cloud Platform (using chef).
  • Reimplemented the “Extract” step in the ETL process (using an API based crawler instead of phantomJS browser).


Backend Developer/DevOps May. 2013 - Jul. 2015 Remote, Egypt
  • Reimplemented large portions of the API to follow better design patterns
    (Hexagonal Architecture, and Pub/Sub pattern).
  • Implemented the test suite for the API.
  • Implemented events booking feature via Stripe.
  • Reimplemented caching for better response times.
  • Maintained the Heroku stacks for staging/production.


Clean Code and the Art of Exception Handling

A Toptal published blog post on different tactics and strategies for exception handling and how to employ them to write cleaner code.


Conway's Game of Life

A mono-repo with different command line interface (CLI) implementations for the Game of Life in multiple languages (currently Ruby/Rust), with the automation for publishing updates to different package managers using a git-ish workflow.


B.E. in Computer Science and Engineering

Arab Academy for Science and Technology

GPA 3.1/4.0 (B - Very Good)

Alexandria, Egypt Sep. 2005 - Jan. 2011