Making listening personal and interactive

Designing and building many areas of our risk management platform

Supporting a team of software engineers with a passion for security, responsible for the security of WhatsApp applications by leveraging program analysis, education and detection.

I built a team responsible for operating and expanding the voice & video calling infrastructure globally and to adapt to new product requests. My role was to grow the team, build a roadmap and set the vision for the next few years.Examples of projects developed by the team:* expansion of the relay network to off-net ISP deployments (Facebook Network Appliance)* support group call functionality (relaying, signaling) by maintaining the same level of reliability and fault tolerance* extend the existing proprietary protocols for interop with TURN (web clients)

I was one of the 3 engineers who built the initial Voice & Video calling product at WhatsApp. I joined the effort in Jan 2015 and we launched the feature a few months later. My role was to build, scale and operate the infrastructure for the entire service on the Facebook Edge Network.* built a low latency and fault tolerant L5 UDP relay in C++ running on FB edge by combining existing load balancing techniques and memcache for distributed session storage https://patents.justia.com/patent/10567217* built a new Global Load Balancer that optimizes peer-to-peer latency (as opposed to client-to-server) https://patents.justia.com/patent/10812323* tool for real-time configuration and delivery of call settings* also built a long term monitoring system for high level product metricsDuring this time I evolved into a Tech Lead Manager role and built a team around these systems

Traffic Infrastructure is responsible for connecting users to the FB's datacenters. My role was to improve the performance and scalability of our global Edge Network (CDN). Highlights: * implemented a high performance and reliable HPACK HTTP header compression in Proxygen in C++, which became part of HTTP/2.0 and still largely running in production even today (2021). I rolled out HPACK on all the FB mobile clients using a cross-platform C++ networking library, achieving a significant reduction in bandwidth across all HTTP traffic (5-10%) * built fine-grained instrumentation in our L7 Load Balancer (Proxygen) and a data pipeline for processing and presenting it to product teams. Some of the metrics required real-time integration with kernel events * improved the performance of video uploads on Facebook with TCP tuning. Worked together with the Videos product team to drive upload success rate from 70% to 95+%

I started my Bootcamp at Facebook in Dublin, where I worked on various mobile projects:* added caching to symbolication of native iOS crashes * prototyped a native version of the Pages Manager app for iOS (ObjC)

During this summer I built a fine-grained real-time monitoring system from scratch, which was running on a production cluster and became open-source at the end of my internship.* storage of the timeseries using a scalable distributed storage system based on OpenTSDB and HBase* UI was built with GWT and MVP pattern (Java, CSS)* host collector and aggregator in PythonThis was my 2nd internship at Facebook, when I was part of the Media Infrastructure team.

I was part of the Infrastructure team where I built systems for collecting, aggregating and reporting errors from the FB's web tier, to overall improve the reliability of the service. I worked in PHP, C++ and Python.In one of the Hackathons, I built an Emacs plugin with heuristics for jumping to function definitions by leveraging an internal code indexing engine.

Bachelor thesis project development

Microcode Team, SS7 Stack Development

NMG, Netcomm Team. I developed a traffic generator for IMA protocol