# Salem (@mahsayedsalem.com)

Profile: https://sifa.id/p/mahsayedsalem.com
Headline: Senior Software Engineer @Cloudflare | Trust & Safety, Abuse Detection
Location: London, England, United Kingdom

## About

A software engineer, a trust and safety advocate, a community builder and an adventurer.

From building greenfield products in startups to building products that serve billions of users in big tech, I have developed an exceptional experience (~and tolerance) in dealing with both binaries and people.

On a quest to make sure that the voices of those who are often overlooked are heard loud and clear.

## Career

- **Senior Systems Engineer at Cloudflare** (2025 - Present)
  London Area, GB
  Member of Cloudforce One Security Research  I design and operate large-scale detection systems that analyse data derived from tens of millions of requests per second across Cloudflare’s global network. This includes building data pipelines, developing new signals, creating scoring systems, and automating detection and enforcement workflows to identify malicious activity at internet scale.
  
  These detections and mitigations protect both Cloudflare (customer zero) and customers who enable Detections for Platforms.
  
  I continue to lead Child Safety Engineering and am a member of the AI Champions team, helping reimagine and rebuild internal processes and services with AI.
  • Rust
  \- Go
  \- TypeScript
  \- Workers
  \- AI
  \- Computer Vision
  \- Data Analysis
- **Systems Engineer at Cloudflare** (Mar 2024 - 2025)
  London Area, GB
  Owner and SME for Child Safety Engineering @Cloudflare.
  
  I own and operate the CSAM Scanner, a content moderation system that helps customers detect, block, and report known Child Sexual Abuse Material.
  
  The platform is capable of scanning hundreds of thousands of frames per second while maintaining high detection accuracy and reliability.
  
  I also own the trusted reporters workflow, from receiving reports and impounding content through to blocking and reporting abusive material.
  
  In addition, I contributed extensively to the development of our internal legal platform and the Trust & Safety Blocks stack.
  • Rust
  \- Go
  \- TypeScript
  \- Kubernetes
  \- Temporal
  \- Workers
  \- Workflows
  \- Queues
  \- Kafka
- **Systems Engineer - CloudFront Caching at Amazon Web Services** (2021 - Mar 2024)
  I focused on HTTP/3 and QUIC protocol work along with anti-DDoS initiatives. My day-to-day was about tackling tough distributed systems and networking problems, making sure a tier-1 service could handle billions of requests per minute reliably and at speed.
  •  Rust
  \- Tokio
  \- QUIC
  \- HTTP3
  \- DDoS mitigation
  \- Nginx internals
  \- Java
  \- C
  \- Caching
  \- Kinesis
  \- Flink
- **Software Engineer - Core Banking at Mnt-halan** (2020 - 2021)
  Cairo, EG
  I worked on a microfinance loan tracking system in Go that processed millions of transactions daily with high availability and low latency. I built reporting and analytics microservices in Go and Python, optimized monthly reporting (cutting response times by 80%), and maintained complex Postgres queries used to calculate financial statistics. I also improved test coverage by adding unit, integration, and end-to-end tests as part of revamping the automation service.
  •  Go
  \- Python
  \- Mongo
  \- Postgres
  \- RabbitMQ
  \- ElasticSearch
  \- Cassandra
  \- Redis
  \- Docker
  \- Kubernetes
  \- gRPC
  \- gin
  \- Minio
- **Software Engineer - Tooling at Valeo** (2018 - 2020)
  Cairo, EG
  I worked in the tooling service line, delivering software and services used by thousands of embedded software engineers worldwide. This included building a web application that aggregated data from multiple systems to track project status and compliance, giving senior management visibility for decision-making. I also developed and maintained microservice-based platforms for automating unit testing, and supported a resource management system that helped team leads allocate workloads more effectively.
  •  Python
  \- JavaScript
  \- Bootstrap
  \- TypeScript
  \- Flask
  \- Angular
  \- Redis
  \- SQLAlchemy
  \- Postgres
  \- Docker
  \- Jenkins
  \- C#
- **Deep Learning Researcher at Valeo** (2018)
  Cairo, EG
  I worked on applying machine learning to autonomous driving, exploring imitation learning and behavior cloning. I built a CNN that learned to predict driver actions from video frames, and trained a Cycle-GAN to translate LiDAR inputs into realistic RGB images.
  •  Python
  \- Tensorflow
  \- Carla Simulator
  \- RL Coach

## Skills

### Other
- Amazon Kinesis
- Amazon Web Services (AWS)
- Apache Flink
- Apache Kafka
- Artificial Intelligence (AI)
- Cassandra
- Cloud Computing
- Cloudflare Workers
- Communication
- Computer Vision
- Cybersecurity
- Data Analysis
- Data Science
- Database Design
- Database Management System (DBMS)
- Deep Learning
- Docker
- Flask
- Generative Adversarial Networks (GANs)
- Generative AI
- Go (Programming Language)
- gRPC
- Image Processing
- Java
- JavaScript
- Kubernetes
- Leadership
- Linux
- Machine Learning
- Microservices
- MongoDB
- Natural Language Processing (NLP)
- Network Security
- NoSQL
- PostgreSQL
- Programming
- Prompt Engineering
- Prototyping
- Public Speaking
- Python
- Python (Programming Language)
- RabbitMQ
- Redis
- REST APIs
- Ruby
- Ruby on Rails
- Rust
- Rust (Programming Language)
- Scala
- Software Architecture
- Software Design
- Software Development
- Spring Framework
- Statistics
- Team Leadership
- Teamwork
- TensorFlow
- Trust and Safety
- TypeScript
- Web Development
- Workflows
- Yara

## Education

- **University of Greenwich** — Bachelor's degree (2014 - 2018)

## Courses

- Embedded Systems
- Theory of Computation
- System Analysis
- Software Engineering
- Pattern Recognition
- Operational Research
- Operating System Concepts
- Object Oriented Software Engineering
- Linear Algebra
- Image Processing
- Fundamentals of Database Systems
- Discrete Mathematics
- Digital Logic
- Data Minining
- Computer Security
- Computer Networks
- Computer Graphics
- Computer Architecture
- Compiler Design
- Client-Side Web Programming
- Artificial Intellegence
- 3D Visualization

## Awards

- Winners (Mar 2018)
  A winner team member in the first Health Hackathon in Egypt organized by Health 2.0, the award is a prize of 30K LE

## Involvement

### Volunteering
- Egytech.fyi (Oct 2021 - Present)
  Community Manager
  For the past few years, I've volunteered to transform the Egyptian tech market through egytech.fyi. This initiative provides transparent and accessible data on tech salaries, job expectations, gender pay gap, skills, and company reviews, available to everyone regardless of social or financial status. Powered by a community of passionate volunteers, we're committed to empowering tech professionals in Egypt.

## Languages

- Arabic (native)
- English (full professional)

## Links

- linkedin: https://www.linkedin.com/in/mahsayedsalem