# Hajime Hayano

> Software Development Engineer experienced in C/C++, Java, and Rust | Ex-Amazon

Location: San Francisco, California, United States
Profile: https://flows.cv/hajime

## Work Experience
### Software Engineer @ Unity
Jan 2024 – Present | San Francisco, California, United States
Team: Offerwall Ads, Security

Security team lead
- Increased the secure development process adoption by 90% on business critical features by working cross-functionally with product/legal/engineering managers to identify security requirements early and defining documentation requirements for design docs.
- Cultivated a shift-left security culture by leading a Security Champions program, organizing monthly meetings with 8 engineers to educate about common vulnerabilities, the security triage process, and secure development practices
- Improved the application and infrastructure security posture by reviewing ~95% of all external facing and business critical features across the organization including mobile applications, server-to-server integrations, and infrastructure migrations.

Cloud Infrastructure Management
- Resolved all critical infrastructure vulnerabilities by utilizing CNAPP tooling, hardening policies and configurations in Terraform/Kubernetes manifests, and working with engineering managers to prioritize security improvements on team roadmaps.
- Reduced risk of lateral movement by moving 100% of business critical secrets into AWS Secrets Manager/Hashicorp Vault. Established organization-wide patterns for secrets management by documenting standard operating procedures and helping engineers onboard their first secrets.

Application Security Improvement
- Remediated 95% of critical and high severity application vulnerabilities by building integrations with SCA and SAST tooling, triaging vulnerabilities across different applications and frameworks, and managing dashboards to monitor new vulnerabilities
- Decreased fraudulent account enrollment on a cash reward mobile app by 85% by defining the security requirements for root detection and duplicate account detection features.

### Software Engineer II @ Amazon Lab126
Jan 2022 – Jan 2023 | Sunnyvale, California, United States
- Device OS Application Framework
    - Designed APIs, implemented app privilege features, and created interface libraries for the security component of the Application Framework. (Rust/C++/Typescript/Yocto Project)
    - Drove efforts to publish APIs to internal and external customers, working with the SDK teams.

- FireOS Factory Reset
    - Designed and implemented an OS factory reset feature that fixed a security vulnerability in eMMC firmware across all supported FireOS versions and 10+ devices. (C/C++/AOSP)
    - Lead discussions with eMMC vendors to triage the issue and worked with the performance team to ensure that the added latency was within the KPI thresholds.

- FairPlay Streaming (FPS) DRM
    - Migrated all devices released post 2021 to an updated version of FPS Content Decryption Module (CDM) and OPTEE Trusted Application (TA) (C/C++/OPTEE)
    - Worked proactively with Apple to triage issues with the new binaries and memory-constrained devices, communicated timelines and progress to ensure timely device certifications.

### Software Engineer @ Amazon Lab126
Jan 2019 – Jan 2022 | Sunnyvale, California, United States
- Upleveled the BSP Diagnostics Service and the factory reset file persistence feature from FireOS 7 to FireOS 8. Redesigned the factory reset file persistence feature due to the underlying AOSP feature being on a deprecation path. (C/C++/Java)

- Mitigated a crystal oscillator supply chain shortage from affecting ~8 million devices by quickly implementing a pragmatic solution that allowed other suppliers to be integrated. (C, C++)

- Created a test suite to automate performance benchmark testing on new SoC candidates. (Python)

- Created a database for hardware benchmarking results with a serverless web frontend powered by an AWS-based backend. (React/AWS Lambda/AWS CloudFormation)

- Triaged and solved issues with Over-the-Air (OTA) updates of FireOS, an Amazon proprietary OS that is extended from Android Open Source Project (AOSP). (C/C++/Java)

### Software Engineer Intern @ Amazon Lab126
Jan 2018 – Jan 2018 | Sunnyvale, California, United States
- Created Amazon Astro-specific functionality to Alexa Routines by designing and implementing a RESTful cloud service in Java.
- Onboarded the new functionality to the Alexa Framework Service team.

### Front Desk Clerk @ University of California, Los Angeles
Jan 2016 – Jan 2017 | Westwood, California, United States

### Software Engineer Intern @ Amazon
Jan 2017 – Jan 2017 | Seattle, Washington, United States
- Designed and implemented DynamoDB expression builder for the Go SDK
- Authored an AWS DevTools blog post introducing the feature, working with the AWS Technical Documentation team.


## Education
### Bachelor of Applied Science (B.A.Sc.) in Computer Science
UCLA
Jan 2014 – Jan 2018


## Contact & Social
- LinkedIn: https://linkedin.com/in/hajime-hayano

---
Source: https://flows.cv/hajime
JSON Resume: https://flows.cv/hajime/resume.json
Last updated: 2026-03-22