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Erhan Kayar

@erhankayar

Message

I build scalable Laravel, React, and AI-integrated SaaS platforms.

Thailand

Message

I've built production-grade SaaS, healthcare, compliance, CRM, and e-commerce applications for Lionia OY, Corecare.ai, ADEO, DataHorizon, Upstack.co, and Minja Co.

At Corecare.ai, I built an AI-driven healthcare platform with Laravel, React, and Inertia, integrating Anthropic and STEDI APIs to reduce manual processing by approximately 80% and improve response times by more than 30%.

I design scalable backend architecture, APIs, databases, and multi-tenant systems using Laravel, modern JavaScript frameworks, AWS, and Docker. I've also led a team of four developers, mentored junior engineers, and delivered backend solutions for international teams.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Developer

Current

Lionia OY (Kiwacomply)

Aug 2024 - Present (2 years 1 month)

Developed and maintained compliance SaaS APIs handling high-volume regulatory data. Refactored legacy components, reducing technical debt and improving maintainability.

Laravel REST APIs SaaS Multi tenant architecture System Scalability

Senior Full-stack Developer

Corecare.ai

Jun 2025 - Dec 2025 (6 months)

Built AI-driven healthcare platform using Laravel, React, and Inertia. Integrated AI APIs (Anthropic, STEDI), reducing manual processing time by ~80% and improving response times by 30%+.

Laravel React Inertia.Js Anthropic API Stedi AI Integration Backend Optimization Scalable Architecture

Senior Backend Developer

ADEO

Aug 2021 - Aug 2024 (3 years)

Delivered new Laravel modules used by enterprise-level clients. Enhanced database performance and query efficiency, collaborating with cross-functional teams to deliver features on time.

Laravel Database Performance Query Optimization Cross Functional Collaboration

Team Lead/Senior Backend Developer

DataHorizon

Aug 2020 - Aug 2021 (1 year)

Led backend development team of 4 developers. Designed scalable backend architecture for growing product needs and mentored junior developers to improve code quality standards.

Team Leadership backend architecture Mentorship Code Quality

Senior Software Engineer

Upstack.co

Apr 2020 - Aug 2020 (4 months)

Delivered backend solutions for international clients in a distributed team. Maintained high code quality and met tight delivery deadlines.

Backend Development Distributed Teams Code Quality Deadline Management

Software Developer/System Administrator

Minja Co.

Jan 2019 - Apr 2020 (1 year 3 months)

Managed full IT infrastructure, improving system reliability. Built CRM, stock, and order systems used across the company and developed e-commerce platforms generating online revenue.

IT Infrastructure CRM Ecommerce System Administration