Onur Uysal

Kobimat AI - AI-Powered SaaS Platform · Independent / Contract, Remote

• Architected and launched an AI-powered SaaS platform with a Next.js/TypeScript frontend and Java/Spring Boot backend, using PostgreSQL and Redis across core application, data, caching, and asynchronous-processing workflows.
• Translate product goals into engineering priorities, milestones, and technical decisions; coordinate delivery across application, AI integrations, infrastructure, and production dependencies while tracking risks and blockers.
• Designed resilient AI workflows with structured-output validation, timeout and retry policies, provider fallback, resumable processing, persistence, auditability, and controlled review/correction paths for unreliable model outputs.

Slothwise - Health Platform · Remote

• Own end-to-end engineering and delivery of a production React Native health application, from mobile architecture and data flows through integrations, release workflows, production support, and technical decision-making.
• Lead technical planning and architecture reviews across mobile and backend-facing work, evaluate implementation trade-offs and production risks, review code and approaches, and establish reusable engineering patterns for contributors.
• Build iOS/Android features including subscriptions, health-data integrations, widgets, calendar synchronization, offline-aware flows, caching, and OTA release workflows.
• Design and implement backend services and versioned REST APIs using Java 21, Spring Boot, Spring Security, PostgreSQL, and Redis, covering authentication, validation, caching, backward compatibility, and resilient mobile integration flows.

İş Sistem - KFC Türkiye · Istanbul, Türkiye

• Owned React Native development, store releases, and production support for KFC Türkiye's consumer application across iOS and Android.
• Used crash data, analytics, user feedback, and store reviews to prioritize improvements that contributed to increasing the app rating from 2.1 to 4.2.
• Participated in technical hiring and supported engineers through interviews, code reviews, implementation guidance, onboarding, knowledge sharing, delivery follow-up, and engineering tooling/repository governance.
• Designed and developed an in-house HR platform using React/TypeScript and Java, Spring Boot, Spring MVC, Spring Security, Spring Data JPA/Hibernate, and PostgreSQL, structuring the backend as a modular monolith with clear domain, application, persistence, and API boundaries inspired by DDD and Clean Architecture.
• Designed HR-domain REST APIs, relational models, transaction boundaries, server-side filtering/pagination, JWT/RBAC authorization, and role-specific employee, manager, and administrative workflows, applying SOLID and dependency-injection patterns to keep business logic testable and maintainable.
• Implemented Redis caching and cache invalidation, asynchronous background processing, PostgreSQL migrations/indexing, JUnit/Mockito integration testing, Dockerized environments, structured logging, health checks, and production troubleshooting for internal services.
• Built and maintained Fastlane CI/CD pipelines, signing, staged App Store/Google Play releases and rollback workflows; strengthened KFC reliability with Sentry, Firebase, Adjust, Insider and GA4, and contributed to Pizza Hut Türkiye’s Next.js platform.

Tapu.com · Istanbul, Türkiye

• Developed B2B and e-commerce products using React Native, Next.js, Angular, and TypeScript/JavaScript, supporting 40K+ weekly active users and high-traffic real-time auction flows.
• Integrated REST APIs and WebSocket services for latency-sensitive bidding across web and mobile clients; improved reliability through automated testing, reconnection strategies, stronger error handling, and state synchronization.
• Worked with backend engineers on concurrency-sensitive real-time system design involving event ordering, stale client state, duplicate requests, reconnection behavior, and consistency across WebSocket-driven auction workflows.
• Contributed to Java backend services and AWS-based production workflows supporting auction and commerce systems, including ECS deployments, SQS-backed asynchronous processing, CloudWatch monitoring, Dockerized environments, and Testcontainers-based integration testing.
• Integrated Sentry, Segment, and Adjust for observability and analytics; built a pull-request automation bot that performed validation checks and reduced manual engineering coordination.

Hastanem Yanımda · Istanbul, Türkiye

• Built and launched a React Native healthcare application that reached 50K+ downloads and a 4.7-star rating across app stores.
• Delivered end-to-end appointment scheduling, real-time patient-doctor messaging, video consultations, payment flows, nearby-pharmacy discovery, and push notifications across iOS and Android.
• Built supporting Node.js, Express, Socket.io, MongoDB, Redis, and Docker services; designed REST/WebSocket flows, data models, caching, idempotent payment/appointment operations, asynchronous background workflows, and supporting AWS deployment/monitoring flows.
• Owned features from product requirements and architecture through API/data-flow design, implementation, deployment, debugging, and production support; later continued as a shareholder and product/technology advisor.