Trail of Bits

Security Engineering

Custom tooling, remediation & DevOps security

Overview

We regularly encounter foundational gaps due to our extensive customer work and research into low levels of security: missing capabilities, opportunities for improvement, and potential vulnerabilities. Our engineering team's aim is to write code that is secure and build tools that our customers can trust to protect their organizations and data.

Trail of Bits Engineering is your support team for security projects. Our experts work with you to build custom tools and remediate system vulnerabilities to keep your software secure -- from development to testing and throughout continuous deployment.

Why work with Trail of Bits

  • 01

    Engineers who've broken the systems they're securing

    Our security engineers come from the offensive-research side of the practice. They've found the bugs they're now defending against — so the controls, tooling, and infrastructure they build are designed against real adversary behavior, not a checklist.

  • 02

    We publish everything

    Custom tooling, hardening patterns, and infrastructure recipes end up in public open-source repos and the Trail of Bits blog. iVerify, osquery contributions, Buttercup, and our DARPA AIxCC work are all open — what we build for you can build on the same foundations.

  • 03

    Deliverables your team can run with

    Custom tools ship with documentation, training, and the rationale behind every design decision. Our goal is for your team to maintain and extend what we've built without needing us — if a solution requires Trail of Bits to stick around forever, it's not a good solution.

Services & deliverables

Custom Software Development

Service

Your organization has decided to add new software to its portfolio, either for customers or for internal operations. However, you don't have the time or dedicated resources, and you want certainty your final product is built on best practices in secure coding, has been thoroughly tested for vulnerabilities, and is hardened against known exploits.

Trail of Bits is your secure development partner. We have helped some of the world's leading security software companies bring reliable products to market. We will review existing software architectures and provide recommendations or fixes, enhance feature sets or write new capabilities, and improve your security testing via Trail of Bits proprietary or custom-built tools.

01
Research prototypes
02
Architecture design and review
03
Trusted component design
04
Secure development in C++, Python, Rust, and other languages
05
Secure development of embedded/IoT device firmware

Open Source Ecosystem Security

Service

Open Source has eaten the software world, and security is no exception. We believe in improving the security of existing open source ecosystems and in developing new security tooling for emerging ecosystems.

Security and quality engineering standards are essential to the longevity of the Open Source ecosystem. The best security tools are the ones that improve developers' lives, rather than adding friction or complexity to their workflows.

01
Package management and supply chain security, including dependency auditing and build security;
02
Code signing and high-integrity deployment;
03
Static and dynamic analysis tool development and integration;
04
High-velocity open-source security and cryptography engineering in the C++, Go, Rust, and Python ecosystems;

Case studies

  • Scalable security: We develop security features like API tokens and Two-Factor Authentication for PyPI, allowing hundreds of thousands of maintainers to improve the security of hundreds of millions of daily Python package installations.

  • Best practices: We build tools for mitigation detection in Windows binaries, helping our clients build CI/CD systems that prevent insecure binaries from being deployed to millions of end users.

  • Fatigue-free tooling: We build developer-friendly tools for dependency auditing and code signing, with an eye for open source and industry adopted standards.

Security Vulnerability Remediation

Service

It's not enough to test your software once. New releases are part of all software lifecycles, and new exploits are published every day.

If we find a security vulnerability, we'll work with you to fix it fast, then provide the information and know-how for you to achieve a hardened security posture.

01
Post-security-assessment bug fixes
02
Redesigning and refactoring code for security

Proactive Security: Measuring, Mitigating, and Enhancing

Service

Our engineers are bullish about improving security so incidents don't occur. From hardening software before it's deployed to adding security to your continuous integration (CI) process, our work mitigates the probability of show-stopping bugs impacting your company's mission.

01
Opting into available OS-level and compiler-level protections
02
Integrating libFuzzer fuzzing test cases into your codebase
03
Security Architecture and Design Reviews and risk assessment
04
Secure API design and implementation
05
Third-party software risk mitigation

DevOps/Operational Security

Service

Application development has become an integral part of business operations, and DevOps teams are highly incentivized to deliver new applications fast. Security can't be left out of the equation. Yet, many companies struggle to integrate security into DevOps workflows, even if it results in more secure software.

Rather than struggle to find the best processes, let Trail of Bits' engineers work with your DevOps team to implement:

We're experts in working alongside DevOps so we understand their processes and procedures, and our custom tools are built for seamless integration. Alleviate your interdepartmental struggles by allowing us to smooth the process while safeguarding against vulnerabilities.

01
Effective key management
02
Correctly configured roles
03
Proper infrastructure controls

What ships with every engagement

Most security-engineering shops hand you a binary and an invoice. Every Trail of Bits engagement ships a deliverable set your engineering team can own and extend after we leave.

Deliverable Trail of Bits Typical security-engineering shop

Source code + design docs

Full source under permissive licensing where applicable, plus architecture decisions and rationale.

✓ Sometimes

Threat model on record

Documented adversary, assumptions, and acceptance criteria — written before any code.

✓ —

Peer-reviewed by a second engineer

Standard Trail of Bits practice; not a one-engineer project.

✓ —

Validation harness (fuzzing / SAST / dynamic)

Tests our work continues to hold up after handoff.

✓ —

Training + knowledge transfer

Live walkthroughs and documentation aimed at making your team self-sufficient.

✓ Sometimes

CI/CD integration ready

Tools ship with the integration patterns your DevOps team needs to deploy them.

✓ —

Open publication of generalizable lessons

Reusable patterns turn into public research so the whole industry benefits.

✓ —

Comparison based on the standard published deliverables of security-engineering and custom-tooling vendors as of May 2026.

Get in touch

Book a technical office hours session

Book a complimentary one-hour meeting with one of our engineers to dive into a challenging technical issue, explore tooling options, and gain valuable insights directly from our experts. This session is purely technical — no sales talk, just a focused discussion that showcases our depth, talent, and capabilities.

Book a Session