currently building at afiniti
Osama Mateen
Senior Software Engineer
I am a Senior Software Engineer with 5+ years of experience designing and shipping cloud-native, distributed systems across fintech and AI-driven products, owning architecture end-to-end, from API design and database modeling to deployment and observability.
Download my resume ↓2021
Cygnis
Media
Media
2022
Cloudnosys
2022
Abhi
(YC S21)
(YC S21)
2024
Afiniti
Experience
4 roles / 5+ yrsAfiniti
Apr 2024 - Present
Senior Software Engineer · Karachi, Pakistan
- Oversaw end-to-end delivery of distributed backend initiatives across multiple services, driving architecture decisions and implementing fault-tolerant solutions that reduced critical service downtime. Conducted code reviews and mentored engineers, contributing to architecture discussions, coding standards, and engineering best practices.
Products shipped
Pairing
Dynamically matches callers with the agent most likely to produce a successful outcome, using behavioral models on live call traffic.
Orchestrator
Controls routing logic and operations across fragmented, multi-channel customer service systems.
AbhiYC S21
Sept 2022 - Apr 2024
Full Stack Engineer · Karachi, Pakistan
- Lead backend development for cloud-native fintech platforms, designing and delivering scalable services using Node.js, NestJS, AWS Lambda, SQS, RDS, and CloudWatch. Developed end-to-end product features using React.js and Next.js alongside backend services
Products shipped
Earned Wage Access
Lets employees of partner companies withdraw a portion of their accrued salary instantly via the Abhi app or SMS, as an alternative to high-interest debt or late fees.
Abhi Open API
Lets third-party platforms integrate and offer EWA services directly to their own users. Built the org hierarchy behind it: each integration partner gets a root organization, with child organizations underneath; employees are scoped to their org, while admins see across every child org.
Cloudnosys
Mar 2022 - Sept 2022
Full Stack Engineer · Karachi, Pakistan
- Developed cloud-native security solutions supporting AWS, Azure, and GCP environments, helping enterprise customers manage compliance, vulnerabilities, and cloud security posture. Built scalable backend services using Node.js, Firebase, and Google Cloud Functions while delivering frontend capabilities with Next.js.
Product shipped
Cloudnosys Platform
A cloud security platform that detects misconfigurations and threats across customer cloud accounts.
Cygnis Media
Mar 2021 - Mar 2022
Full Stack Engineer · Karachi, Pakistan
- Designed and developed RESTful APIs using Node.js and Express.js to support large-scale web applications and seamless frontend-backend integration. Applied microservices and monolithic architectural patterns to improve scalability, maintainability, and overall application performance.
Product shipped
MyFBAPrep
A shipment tracking platform for 3PL fulfillment, used by Amazon sellers and enterprise retail brands to manage order flow across multiple warehouses. Built as a distributed system of microservices with heavy async job processing, across the seller, warehouse, and admin portals, shipping consolidated billing, dashboard reporting, multi-warehouse management, and order tracking.
My College Roomie
A roommate matching platform that connects users based on compatibility criteria. Developed a multifaceted platform that could address the complex needs of both students and housing staff. The system streamlined the roommate matching process, facilitated social connections, automated administrative tasks, and integrated seamlessly with existing campus systems - all while maintaining a user-friendly interface and ensuring data security.
Stack
Tools & practicesLanguages & Frameworks
Node.jsTypeScriptNestJS
Express.jsReact.jsNext.js
GraphQLLangChainLangGraph
PythonDjangoFastAPI
Cloud & DevOps
AWS LambdaS3SQS
RDSCloudWatchGCP
DockerCI/CDServerless
Databases
PostgreSQLDynamoDBMongoDB
RedisChromaDB
AI & LLMs
Context EngineeringPrompt Engineering
RAGMCP
Agentic SystemsVector Databases
LLM ObservabilityLLM Evaluation
Testing
VitestJestUnit Testing
Integration TestingTDD
Architecture
MicroservicesREST APIs
Event-drivenCloud-nativeDistributed Systems
Practices
Agile/ScrumCode Reviews
MentorshipObservability
Education
BS Computer Science
Institute of Business Management (IoBM), Karachi, Pakistan
2017 - 2021
Writings
On MediumWhat Makes an API RESTful
VS Code Extensions To Enhance Your Coding Experience
Clean Code Simplified: A Practical Guide