Masrik Dahir

Jan 2025 - Present

Designed and implemented a scalable, event-driven microservices architecture on AWS to automate detection of expired IAM and ACM certificates across all Capital One accounts. Utilized decoupled Lambda functions orchestrated via SQS queues: one function aggregated multi-account metadata and published to SQS; a second function concurrently consumed messages to identify expired certificates and relay findings to a downstream SQS queue, which triggered a final Lambda function to persist results in DynamoDB for centralized auditing and compliance reporting
Led the migration of secrets for business applications (BACERTIFICATECATALOG, BAACMAUTOMATION, BATLSCERTMANAGER) to AWS Secrets Manager in compliance with ETB-1943. Transitioned from unmanaged to managed secrets, automating secret lifecycle management and eliminating operational overhead and run-the-engine work
Developed and integrated live dependency tests for business applications (BACERTIFICATECATALOG, BATLSCERTMANAGER) in accordance with CTB5 standards. Migrated test framework from Puppeteer to Playwright, improving CI/CD reliability, reducing flakiness, accelerating build times, and resolving long-standing technical debt

Jul 2023 - Dec 2024

C#, .NET, .NET Framework, Entity Framework, ASP.NET, ASP.NET Core, NUnit
TypeScript, React, REST APIs with .NET and C#, Microsoft SQL Server
AWS: DynamoDB, EKS, Lambda, Athena, SQS, SNS, S3, Fargate, EC2, IAM, Terraform, DataBrew, Glue
Datadog, Alteryx, Databricks
Built dynamic and generic processes to handle ETL jobs
Separation of concerns, microservice API, storage and memory management via throttling and threading, dynamic workflow for plans with conditional branching
Built File Sync to transfer files between SFTP, FTP, UNC, and S3 with configurable chunking, decompression, throttling, and file structure
Built Dynamic Message Transmitter to transmit messages to and from SQS, SNS, and Apache Kafka
Used Kubernetes to scale microservice APIs, implemented Redis Cache on API routes to reduce latency
Built Stage Athena to copy data streams from Athena to Microsoft SQL Server and PostgreSQL (schema conversion & data insertion)
Built Step Function Invoker to monitor step function steps and paths
Built pipelines and processes for school and tenant data: Homes.com, Apartments.com, Costar.com, and Loopnet.com
Built frontend architecture to display residential and commercial data

May 2022 - Jun 2023

Node.Js: NVM, HTTP API, Fastify, DynamoDB, NPM, Yarn;
Vue.Js: Vue CLI, database;
AWS: IAM roles, EC2 instances, S3 buckets and policy, ASGs, ALB, Lambda functions, Node API
UI Designing, Full Stack development, Agile development, REST API Call, Content and Performance Testing, building API endpoint, cache and content management, JIRA board, Postman
Introduced a new caching entry to a Partner API for holding a list of capabilities
Created resource layer to enable new endpoints and performed Content and Performance Testing
Added a feature to visualize a preview of email communication sent to capital one customers
Used agile development with JIRA Board to collaborate with the team; Created a UI for a Spring Boot application
Maintained, committed, and resolved issues in message-preview repository

May 2022 - Aug 2022

Aug 2021 - May 2022

Built and coded automated Rampantries (food cart at VCU Monroe Park Campus); and
Used Raspberry pi to receive data and save it in the Cloud storage.

Jun 2021 - Jan 2022

May 2021 - Sep 2021

5G and Edge Technology, Artificial Intelligence, Business Ethics, Cable Routing Basics, etc.
Participated and contributed in live events

Jun 2021 - Jul 2021

Developed a secured system in blockchain to process insurance claims and prevent fraudulent claims and cyber-attacks i.e. Sybil attack, 50% attack, Timestamp manipulation, Malware, and Malicious code injection;
Web Development, Angular Framework, Typescript, Hyperledger Composer. MySQL, Big Data Analysis; and
Firebase, AWS Services, Hadoop HDFS, Blockchain Technology, Formal Verification of System, Attack Scenarios.
NSF funded

Civilian Cyber

Feb 2021 - Jun 2021

Working on Joomla, Moodle framework; Administering databases; Integrating plug-ins: Community Builder, Joomdle; and
Developed advanced automation capable of providing feedback based on user's performance; and
Penetration Tests.

SAFE Lab

Jun 2020 - May 2022

Researched in concept map files comparison and analysis using the algorithm; and
Computer Programs: CmapTools, PyCharm; Programming Language: Python; Libraries: Nltk, Graphviz, XML, Natural Language Processing.

Creating a Graphical User Interface (GUI) that allows the memory of a virtual machine to manipulate the memory contents (demonstrate malware intrusion), Virtual Machine Introspection; and
Programming Language: C, Python; Libvmi library, Volatility library, GUI Libraries (i.e., PyQT5).

RamSec: Cybersecurity Lab

Jan 2021 - Sep 2021

Studying the existing models (IP Trackback Technique, Packet Market Technique, Entropy Variation, Signature-based detection, Anomaly Detection) to prevent DDoS attacks; and
Researching the server CPU loads in Syn Flood attack using Quic and TCP packets.