Ozan Yaldır

Built the mobile application for iOS and Android using React Native (Expo), implemented backend services with NestJS, and designed the cloud infrastructure on AWS. This included running backend services on EC2, using RDS MySQL as the primary database, storing user assets on S3, distributing media through CloudFront, and managing logs and metrics with CloudWatch. I also used AWS Lambda for background workers and asynchronous tasks, AWS Secrets Manager for securely handling credentials and environment configuration, and Amazon ElastiCache (Redis) to enable horizontal scaling for real-time messaging and Socket.IO communication across multiple EC2 instances.

Managed all technical, design, and operational aspects independently, continuously iterating and optimizing the product based on user feedback and analytics.

My primary focus was designing and building microservices with Go Programming Language and Node.js microservices for blockchain integrations, powering the company’s cryptocurrency treasury management and B2B financial infrastructure. I worked extensively on scalable, event-driven backend systems that interacted with networks such as Stellar, EVM chains, and Solana, delivering high-reliability services for cross-border transactions.

My responsibilities expanded across multiple areas of software engineering, including architecting distributed systems, integrating blockchain rails, and ensuring the scalability and reliability of mission-critical services.

Throughout this period, I worked extensively with a wide range of infrastructure and DevOps tools, including AWS, Docker, HashiCorp Vault, Rancher, SonarCloud, Jenkins, GitHub Actions and New Relic. These tools were essential in ensuring secure deployments, optimizing system performance, enabling CI/CD, and maintaining visibility into production environments.

This was an application designed to help users take, find, and relate notes and memories to create a map of notes and their connections, making it easier to organize and recall information. Discontinued development due to a lack of investment.

During the development, I was responsible for building the iOS app using Swift (SwiftUI) and used GraphQL for networking.

I’ve always been drawn to the fast-paced nature of startups, which led me to join Sinemia, a rapidly growing company that had recently expanded from Turkey to the USA.

At Sinemia, I had the opportunity to rebuild the iOS application by migrating it from Ionic to a fully native implementation. This was my first time owning a mobile app development process from the ground up. After delivering version 1, the project continued with a team of five developers.

I developed social features for both Android and iOS apps. My role was building social features, where I used Socket.io for implementing real-time messaging.

I used Swift for iOS and Kotlin for Android to build and integrate these features, ensuring seamless communication and a polished, intuitive experience across both platforms.

I was responsible for developing and maintaining the iOS application, working with Objective-C (Fully programmatic UI). During this time, I had the opportunity to work with new technologies, such as real-time messaging and video calls.

During my university education, I had my first professional working experience at Manggis Information Systems, a company that develops technology products for a wide range of clients. I was part of a team responsible for developing and maintaining iOS applications. All of the projects were written in Objective-C, with UIKit used for UI development.

This role provided me with valuable experience in mobile development and the opportunity to work on various client projects, enhancing my skills in both iOS development and team collaboration.