Alex Denisov - Staff Software Engineer, Compilers at Photonic Inc.

Alex Denisov

Staff Software Engineer, Compilers at Photonic Inc.

Berlin, Germany

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Summary

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Alex Denisov is a Staff Software Engineer specializing in compilers with 14 years of experience building language tooling, runtimes, and static analysis support across startups and developer platforms. Based in Berlin, he has driven compiler work for ML/AI workloads and CodeQL at GitHub, contributing significant Swift extractor functionality to a security-critical, widely used CodeQL codebase. A co-founder of DragonRuby, he also architects compilers and runtimes for Ruby/MRuby and has deep experience with LLVM, Objective-C, and iOS toolchains from consulting and open-source contributions. His work blends low-level code generation, AST and metadata extraction, and pragmatic testing improvements—often surfacing subtle language/runtime edge cases into robust warnings and fixes. Colleagues rely on him to untangle complex compiler bugs and evolve schemas and extractors that feed large-scale code-analysis systems.

14 years of coding experience

14 years of employment as a software developer

Open International University of Human Development "Ukraine"

Computer Academy "Step", Ukraine

English, Ukrainian, Russian, German

Stackoverflow

Stats

4,102reputation

261kreached

75answers

5questions

Badges

llvm

top-5%

mongodb

top-5%

mongodb-query

top-5%

Github Skills (37)

objective-c10

matcher10

testing10

test-framework10

c1110

object-oriented-programming10

codeql10

ast-parser10

c1710

compiler-compiler10

parsing10

cplus10

parse10

compiler10

swift10

Programming languages (22)

JavaC++CSSRustCObjective-C++ScalaGo

Github contributions (5)

github/codeql

May 2021 - Jan 2023

CodeQL: the libraries and queries that power security researchers around the world, as well as code scanning in GitHub Advanced Security

Role in this project:

Back-end Developer

Contributions:1 release, 413 reviews, 247 commits in 1 year 8 months

Contributions summary:Alex's primary contributions revolve around implementing and extending the CodeQL extractor for the Swift language. This includes the introduction of a `SwiftDispatcher` class for handling AST node emission, the creation of visitors for different Swift AST node types (Decl, Stmt, Expr, etc.), and the addition of code to extract and handle location information, comments and system modules. The user made several changes to the database schema to support the new extracted data. They also made various refactoring and cleanup changes in the code.

github-advanced-securitysecurity-toolsgithub-security-labsecurity-researcherssecurity

cedarbdd/cedar

Sep 2013 - Apr 2014

BDD-style testing using Objective-C

Role in this project:

QA Engineer / Test Automation Engineer

Contributions:11 commits, 5 comments in 6 months

Contributions summary:Alex primarily focused on enhancing the testing capabilities of the Cedar BDD framework for Objective-C. They implemented and refactored matchers, including adding the `responds_to` (later renamed `respond_to`) matcher and extending the `raise_exception` matcher with functionality for checking exception names. They also addressed code style and formatting issues within the test suite.

objective-cbdd-styletestingbddunit-testing

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