# Heartlin Machado > Senior Software Engineer | Security Infrastructure Location: Nashville, Tennessee, United States Profile: https://flows.cv/heartlin Who I am Security-focused engineer building infrastructure to prevent irreversible loss in digital asset systems. What I’m building Designing signing-layer and control-plane enforcement that evaluates deterministic policy before a cryptographic signature is produced — the last reversible boundary in crypto. The problem Most crypto security is reactive. Alerts trigger after execution, when funds are already gone. Compromised code, credentials, CI/CD pipelines, and custody control planes can all authorize valid signatures. The approach Enforce intent at the signing boundary itself. Evaluate policy deterministically before authorization occurs — shifting from post-event detection to pre-signature prevention. Execution Background in Web3 security, cloud infrastructure, and applied AI. Built production systems across AWS, Node/Python, Postgres, and real-time detection pipelines. Currently working with custody and exchange teams to evaluate signing-boundary enforcement in shadow deployments prior to broader rollout. Writing Why blocking transactions before signing is the future of crypto security: https://medium.com/@heartlinmachado/why-blocking-transactions-before-signing-is-the-future-of-crypto-security-f5e6cceb3252 Medium: https://medium.com/@heartlinmachado ## Work Experience ### Senior Software Engineer @ Phosphorus Cybersecurity Inc. Jan 2024 – Present | Nashville, TN 1) Architectured, Developed , Deployed Microsoft Sentinel Integration with responsive actions. 2) Developed multiple DDI integrations such as Infoblox and Bluecat. 3) Integrated with external cybersecurity platforms such as Qualys to send asset data from Phosphorus to Qualys for vulnerability scanning and extensive discovery. 4) SMTP Service - Designed and implemented a robust SMTP service for managing email configurations - Created flexible email sending capabilities with support for multiple formats (CSV, JSONL) - Implemented secure storage and management of SMTP credentials - Added support for automated report delivery via email 5) Custom Report Service - Built a comprehensive custom report generation system - Implemented features for creating, editing, and managing custom reports - Added support for scheduled report generation and delivery - Created a tracking system for report execution history - Integrated with existing device and scan data systems Technical Highlights: - Used TypeScript with dependency injection for clean architecture - Implemented PostgreSQL for data storage with proper indexing - Created RESTful APIs for service integration - Added comprehensive error handling and logging - Implemented automated testing for reliability This work enables our platform to provide more flexible reporting options and automated communication capabilities to our users. ### Software Engineer - II @ Phosphorus Cybersecurity Inc. Jan 2023 – Jan 2024 | Nashville, Tennessee, United States 1) Re-architectured the DBMS in PostgreSQL which resulted in 70% quicker response time for front end application. 2) Designed and implemented external integrations with credential providers which helped increase business ARR. 3) Created support scripts using Python for clients to help migrate credential information from one platform to another. 4) Developed and maintained high-performance backend systems using Node.js which helped the business improve their POV conversion rate and also expand clientele. 5) Designed and implemented the migration from GraphQL to SQL which increased the performance of the app by 30%. 6) Created UI components using React.js which improved customer engagement. 7) Architectured, Developed, Deployed ServiceNow Applications - Service Graph Connector for Phosphorus - Vulnerability Response Integration with Phosphorus - IT Service Management (ITSM) with Security Incident option with Post deployment support. ### Software Engineer @ Sur La Table Jan 2021 – Jan 2023 | United States 1) Developed python apps for platform services leveraging AWS services 2) Used terraform to create ECS tasks, AWS repositories, queues and topics. 3) Created and scheduled jobs in AWS in ECS and also as lambda tasks. 4) Used docker to containerize and run the application. 5) Created and exposed APIs using the Django web framework. 6) Set up CI/CD pipelines to build, test and deploy the application. 7) Created and exposed APIs using the FastAPI framework. ### Software Engineer Intern @ Biogen Jan 2020 – Jan 2020 | Greater Boston Area 1)Developed a website using Django framework 2)Used Django REST framework to display interactive information about pharmaceutical compounds. 3)Gathered and cleaned data from public data sources. 4)Maintained backend database using mysql. 5)Created website UI using Html5,JS,CSS3. 6)Used Datatables api for website data display. 7)Converted unstructured data and gathered insights for data analysis. 8)Maintained data using mongodb for highly fluctuating data . 9)Gathered , cleaned and fed data for toxicity prediction on Postgres DB. 10)Used Machine Learning tools such as TensorFlow,Pytorch for predicting toxicity of the compound based on Tox21 ### Graduate Teaching Assistant - Programming Design Paradigm @ Northeastern University Jan 2019 – Jan 2020 | San Jose,USA ### Graduate Teaching Assistant - Computer Systems @ Northeastern University Jan 2019 – Jan 2019 | San Jose,USA Worked as a TA for Computer Systems,Guided Shell scripting and IPC's(HTTP,FTP) and created a Virtual File System which is capable of mounting on the existing file systems or can be used as a separate disk in itself. ### Graduate Teaching Assistant - Mobile Application Development @ Northeastern University Jan 2019 – Jan 2019 | San Jose,USA Worked as a TA for Mobile Application Development,Guided capstone projects,Created a prototype for simple iOS login application and a standalone login information hacking application ## Education ### Master of Science - MS in Computer Science Northeastern University ## Contact & Social - LinkedIn: https://linkedin.com/in/heartlin-machado-81b220127 --- Source: https://flows.cv/heartlin JSON Resume: https://flows.cv/heartlin/resume.json Last updated: 2026-03-30