João S - Lecturer at Microsoft

João S

Lecturer at Microsoft

Abbotsford, British Columbia, Canada

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Summary

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Rockstar

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Top School

João S is a compiler-focused software engineer and lecturer based in Abbotsford, Canada, with three years of industry experience and an academic MSc in Computer Science. He contributes to the LLVM project, implementing HLSL features and DXIL/SPIR-V lowering—work that surfaces in one of the most prominent open-source compiler toolchains. At Microsoft he splits time between Clang HLSL support and platform engineering for payroll systems, demonstrating fluency across low-level compiler internals and cloud-backed application stacks. Former roles at Cyral and as an MSc researcher show a strong background in high-performance Go services, ETL/Big Data pipelines, and automated compiler transformations for privacy compliance. He blends practical production experience with research rigor, and unusually for a compiler engineer also ships full-stack features in React, C#, and Azure.

3 years of coding experience

2 years of employment as a software developer

MSc, Computer Science, MSc, Computer Science at Universidade Federal de Minas Gerais

The Pontifical Catholic University of Minas Gerais

English, Portuguese

Github Skills (9)

spirv10

hlsl10

dx10

dxc10

compiler-development10

shader9

llvm9

cprogramming-language9

c-language9

Programming languages (4)

C++LLVMTeXPython

Github contributions (5)

llvm/llvm-project

Jul 2024 - Mar 2025

The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.

Role in this project:

Back-end Developer

Contributions:146 reviews, 54 PRs, 63 pushes in 8 months

Contributions summary:João primarily focused on implementing and enhancing HLSL (High-Level Shading Language) features within the LLVM project's compiler toolchain. Their work involved adding new HLSL functions like `asuint`, `asfloat`, and `splitdouble`, alongside their corresponding DXIL (DirectX Intermediate Language) and SPIRV (Standard Portable Intermediate Representation) lowering implementations. Furthermore, they contributed to the implementation of the `clip` function and added support for `bufferUpdateCounter` including fixing signature and debugging information generation for HLSL RWBuffer types. The user's contributions are concentrated on improving the HLSL compiler's capabilities.

compilerstechnologiesclangsubmittoolchain

joaosaffran/llvm-project

Sep 2024 - Mar 2025

The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.

Contributions:2 PRs, 415 pushes, 79 branches in 6 months

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