At-Scale Code Improvements You Can Prove
BrontoSource helps teams modernize complex systems safely with transformations that are explicit, repeatable, and verifiably correct.
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solution
Deterministic Code Transformation
Automatic C++ Refactoring at Scale
Derisk, Secure, and Stabilize
About Us
BrontoSource was founded in September 2024 by a team of driven ex-Google engineers. We love seeing codebases flourish and building tools that anticipate the entire software lifecycle. We bring decades of experience maintaining the world's largest codebases, keeping them healthy and making them self-healing.
Problem
Modernizing critical systems is risky
Large C and C++ codebases evolve over decades, making change risky. For critical systems, uncertainty isn’t acceptable.
01
Manual refactoring does not scale
Large systems often require engineers to manually update thousands of files, making changes slow, expensive, and difficult to repeat reliably.
02
Automation often introduces risk
Scripts and custom tooling can break when code structures change, creating inconsistent results across the codebase.
03
AI tools cannot guarantee correctness
AI-generated changes may look correct, but they cannot provide deterministic results or provable correctness.
04
Critical systems require provable change
Infrastructure and security software must evolve safely. Every change must be predictable and reviewable.
How It Works
Define once. Transform everywhere.
01
Define a transformation rule
Create explicit transformation patterns that describe how code should change consistently across the entire codebase.
02
Validate behavior
Test transformations on sample code to confirm predictable results before applying them to production systems.
03
Apply across the codebase
Execute transformations across thousands of files automatically, ensuring consistent updates without manual refactoring.
04
Review deterministic diffs
Review generated diffs confidently, knowing every change is deterministic, repeatable, and fully traceable.
our stats
Built for Large-Scale Systems
Bronto is designed for engineering teams responsible for large, long-lived systems. By applying deterministic transformations across entire codebases, teams can modernize critical infrastructure safely, consistently, and at a scale that manual refactoring cannot match.
100M+
Lines of code transformed safely
10,000+
Files refactored in a single transformation
4× Faster
Modernization compared to manual refactoring
100% Deterministic
Transformations produce predictable, repeatable results
talks
Deep Dives Into Infrastructure, Systems, and Design.
Explore how we think about designing systems, scaling processes, and maintaining large code bases.
Declarative Refactoring for the Masses in C++ - Andy Soffer - C++Now 2025
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Is The Future of C++ Refactoring Declarative? - Andy Soffer - CppCon 2025
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Growing Your Toolkit From Refactoring to Automated Migrations
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CppCon 2017: Matt Kulukundis “Designing a Fast, Efficient, Cache-friendly Hash Table, Step by Step”
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Abseil's Open Source Hashtables: 2 Years In - Matt Kulukundis - CppCon 2019
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Reflect *this!: Design and Implementation of a Mixin Library with Static Reflection - Andy Soffer
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Building a Lock-free Multi-producer, Multi-consumer Queue for Tcmalloc - Matt Kulukundis...
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Lightning Talk: Your Very Own Godbolt - Andy Soffer - C++Now 2025
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Lightning Talk: Ship Comms - How do They Work? - Matt Kulukundis - C++Now 2025
testimonials
A word from our customers
“What stood out most was their technical depth. From architecture to low-level performance work, BrontoSource felt like a true engineering partner rather than just another vendor.”
“BrontoSource helped us move from fragile prototypes to production-grade systems much faster than we expected. Their team thinks deeply, builds cleanly, and delivers with confidence.”
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“They brought clarity to a complex problem space and shipped solutions our internal team could actually build on. Sharp, practical, and extremely reliable.”
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“What stood out most was their technical depth. From architecture to low-level performance work, BrontoSource felt like a true engineering partner rather than just another vendor.”
“BrontoSource helped us move from fragile prototypes to production-grade systems much faster than we expected. Their team thinks deeply, builds cleanly, and delivers with confidence.”
“They brought clarity to a complex problem space and shipped solutions our internal team could actually build on. Sharp, practical, and extremely reliable.”
“What stood out most was their technical depth. From architecture to low-level performance work, BrontoSource felt like a true engineering partner rather than just another vendor.”
“BrontoSource helped us move from fragile prototypes to production-grade systems much faster than we expected. Their team thinks deeply, builds cleanly, and delivers with confidence.”
“They brought clarity to a complex problem space and shipped solutions our internal team could actually build on. Sharp, practical, and extremely reliable.”
“What stood out most was their technical depth. From architecture to low-level performance work, BrontoSource felt like a true engineering partner rather than just another vendor.”
“BrontoSource helped us move from fragile prototypes to production-grade systems much faster than we expected. Their team thinks deeply, builds cleanly, and delivers with confidence.”
“They brought clarity to a complex problem space and shipped solutions our internal team could actually build on. Sharp, practical, and extremely reliable.”
Insights
Engineering at Scale
Software development is complicated. Especially when automated migrations, planning for secure software, and AI all come into play. We have a lot of ideas that we would love to share, but feel free to ask questions!
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Refactoring is secretly inlining
I'm excited to share a refactoring tool for C++ that I've been working on for the past month or so. In its simplest form, it inlines functions and type aliases of your choosing everywhere they're used
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Why migrate from C and C++ to Rust?
At BrontoSource, we are language nerds with deep expertise in and fondness for C and C++.
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Memory Safety after Salt Typhoon
Most folks have heard about the massive Salt Typhoon Cyberattack that compromised at least 8 telecoms, but this is just the tip of the proverbial iceberg.
Read More
Contact
contact us
If you are interested in learning more, partnering with us as an early customer, or investing, please reach out! You can also subscribe to our announcement list to receive updates about what we are doing.
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