Senior Full Stack Developer (Java & React)

Are you passionate about building reliable, scalable web applications from end to end? Do you bring strong experience in Java and React, enjoy solving complex technical challenges, and want to help shape a product’s technical direction? Join our team and contribute across the full development lifecycle, from solution design to production.

Senior Full Stack Developer work

As a Senior Full Stack Developer, I design, develop, and maintain applications across the Java backend and React frontend. I translate business requirements into secure, maintainable solutions, taking ownership of features from initial discussion through implementation, testing, and delivery.

On the backend, I build and improve Java-based services using the Spring Framework, RESTful APIs, and microservices architecture. I optimize performance and reliability, using AWS services such as Lambda, API Gateway, DynamoDB, S3, and EC2 where appropriate.

On the frontend, I create responsive, user-friendly interfaces using React, TypeScript, HTML, and CSS. Working closely with UI/UX colleagues, I turn designs and user stories into reusable components, manage application state, and ensure smooth integration with backend services.

As a senior member of the team, I contribute to architectural decisions, evaluate technical trade-offs, and help establish development best practices. I review code through GitLab merge requests, mentor colleagues, and improve code quality, automated testing, and the development process.

I collaborate with product, development, database, and DevOps teams to deliver features and troubleshoot issues across the application stack. I also have opportunities to deepen my infrastructure-as-code knowledge using Terraform. My experience with PHP can be useful when supporting the migration of legacy platform components to Java.

We are obliged to comply with HIPAA, keeping clients' protected health information (PHI) safe. Our goal is to follow ISO 27001, the leading international standard focused on information security.

Tech stack requirements

To excel in this role, I'll need strong experience in full stack development using Java and React. Proficiency in core Java, Java EE, and the Spring Framework, together with React, TypeScript, HTML, and CSS, is a must. I should be comfortable designing and integrating RESTful APIs, working with microservices architecture, and using state management libraries such as Redux. Experience with automated testing, Git-based workflows, and CI/CD processes will help me maintain high code quality. As a senior developer, I'll also bring the ability to guide technical decisions, take ownership of complex features, and mentor colleagues.

Understanding of AWS services like Lambda, API Gateway, DynamoDB, S3, and EC2 would be beneficial, but not essential. Familiarity with Terraform, Azure services, or PHP for legacy migration is an additional advantage.

As a Senior Full Stack Developer, I’ll be responsible for designing, developing, and maintaining Java-based backend services and React web applications. I’ll create innovative solutions using modern technologies, delivering secure, scalable applications and a seamless user experience.

Salary range From 3 000 gross/month. Final salary agreement depends on candidate's skill-set and experience.

Language skills English – Upper intermediate (B2) and Slovak – Proficiency (C2)

Personality Requirements

What matters most is your passion for agile and jira, problem-solving skills, and ability to collaborate effectively.

Employee perks, benefits My company supports me in improving my qualifications and knowledge through various voluntary courses and conferences. I’m working mostly remotely, with regular weekly office days in our Košice office, where I get to meet my colleagues, enjoy great coffee and drinks, chill in our relax room and, after office hours, I meet my co- workers and enjoy our teambuildings. We are a leading American company, but we don’t have to work US working hours. My colleagues can usually reach me within our regular core hours - between 9 AM and 3 PM. We are working in flexible working time mode and I’m able to manage my working time. And most importantly! My overtimes are automatically compensated on a monthly basis. In addition, let’s mention our office, a very cozy and informal space in the Košice city center.

Senior Full Stack Developer (Java & React)Are you passionate about building reliable, scalable web applications from end to end? Do you bring strong experience in Java and React, enjoy solving com