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Hi, I’m Merek Araya, an experienced full-stack developer with over 10 years in the industry. I've worked across finance, investment, and transportation sectors, building scalable applications that support thousands of users. I'm passionate about crafting secure, high-performance solutions and enjoy collaborating with teams to create seamless user experiences across web and mobile platforms using technologies like Java, .NET Core, React, and AWS. My expertise includes backend and frontend development, cloud infrastructure, and automating deployment processes to improve efficiency. I pride myself on delivering robust, maintainable code and continuously improving system performance, always with the end-user in mind.…Hi, I’m Merek Araya, an experienced full-stack developer with over 10 years in the industry. I've worked across finance, investment, and transportation sectors, building scalable applications that support thousands of users. I'm passionate about crafting secure, high-performance solutions and enjoy collaborating with teams to create seamless user experiences across web and mobile platforms using technologies like Java, .NET Core, React, and AWS. My expertise includes backend and frontend development, cloud infrastructure, and automating deployment processes to improve efficiency. I pride myself on delivering robust, maintainable code and continuously improving system performance, always with the end-user in mind.

Merek Araya

Full Stack Developer, Developer, Back-End Developer, +2

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Hi, I’m Merek Araya, an experienced full-stack developer with over 10 years in the industry. I've worked across finance, investment, and transportation sectors, building scalable applications that support thousands of users. I'm passionate about crafting secure, high-performance solutions and enjoy collaborating with teams to create seamless user experiences across web and mobile platforms using technologies like Java, .NET Core, React, and AWS. My expertise includes backend and frontend development, cloud infrastructure, and automating deployment processes to improve efficiency. I pride myself on delivering robust, maintainable code and continuously improving system performance, always with the end-user in mind.…Hi, I’m Merek Araya, an experienced full-stack developer with over 10 years in the industry. I've worked across finance, investment, and transportation sectors, building scalable applications that support thousands of users. I'm passionate about crafting secure, high-performance solutions and enjoy collaborating with teams to create seamless user experiences across web and mobile platforms using technologies like Java, .NET Core, React, and AWS. My expertise includes backend and frontend development, cloud infrastructure, and automating deployment processes to improve efficiency. I pride myself on delivering robust, maintainable code and continuously improving system performance, always with the end-user in mind.

Available to hire

Hi, I’m Merek Araya, an experienced full-stack developer with over 10 years in the industry. I’ve worked across finance, investment, and transportation sectors, building scalable applications that support thousands of users. I’m passionate about crafting secure, high-performance solutions and enjoy collaborating with teams to create seamless user experiences across web and mobile platforms using technologies like Java, .NET Core, React, and AWS.

My expertise includes backend and frontend development, cloud infrastructure, and automating deployment processes to improve efficiency. I pride myself on delivering robust, maintainable code and continuously improving system performance, always with the end-user in mind.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Polish

Advanced

Spanish; Castilian

Intermediate

Work Experience

Full Stack Developer at Mobilise, London, UK

May 1, 2022 - May 31, 2025

Designed and developed backend systems for multi-platform apps using Java and Spring Boot, supporting over 10,000 active users monthly across taxi and fitness apps. Collaborated with designers and developers to ensure consistent user experience across iOS and Android apps, contributing to a 10% increase in user retention. Automated AWS deployment and configuration, reducing deployment time by approximately 25%. Documented APIs with Swagger, improving API integration efficiency by 20% within the development team. Customized npm modules for React Native using Kotlin, accelerating mobile feature development by 15%. Built a Headless CMS with Node.js and Firebase, cutting mobile content update time by 70%.

Backend Developer at Santander Consumer Finance, Madrid, Spain

June 1, 2020 - May 31, 2022

Engineered data masking protocols for personally identifiable information using .NET Core, satisfying 100% of GDPR compliance requirements and ensuring customer data privacy and security. Developed backend services for an investment platform handling transactions worth several million euros monthly, using .NET Core, NestJS, and FastAPI. Designed REST APIs for financial analytics and deal flow management, improving response times by 15%. Used Entity Framework Core to optimize database operations, decreasing query times by 20%. Implemented JWT-based authentication and role-based access control, securing access for 20+ user roles. Containerized applications with Docker, improving deployment reliability and reducing downtime by 10%. Automated CI/CD pipelines with GitHub Actions, shortening release cycles from two weeks to 10 days.

Junior JavaScript Developer at CD Finance Poland, Lublin, Poland

October 1, 2016 - May 31, 2020

Engineered and maintained financial dashboards using React and Redux, enhancing finance team reporting efficiency by 25%. Built 5+ responsive web/mobile apps supporting loan processing and client onboarding across multiple European markets. Integrated real-time notifications and client status updates with Firebase and Socket.io, improving workflow tracking accuracy. Worked with backend teams to consume secure APIs managing payment processing for thousands of transactions monthly. Constructed reusable UI components, reducing development time for new features by 20%.

Frontend Developer at Dovilo Poland, Lublin, Poland

September 1, 2014 - September 30, 2016

Created mobile-responsive React.js front-ends for identity management applications, improving user engagement by 10%. Collaborated with UX designers to deliver pixel-perfect UI, reducing frontend bug rate by 5%. Optimized frontend performance, reducing average page load time by 10%. Spearheaded the migration of three legacy applications to a modern React-based architecture, decreasing technical debt by 15% and reducing codebase size by 20%.