Fullstack Developer - Java & React

About the role:

We’re looking for an experienced Fullstack Developer (Java & React) to join our product team and help build and evolve our Workflow and Automation solutions, used by thousands of companies worldwide. You’ll work in a small, empowered Scrum team that values ownership, collaboration, and continuous improvement. You’ll collaborate closely with Product Owners, Product Managers, UX/UI designers, and other development teams to deliver features driven by user needs and business goals. You’ll contribute to a complex, well-designed SaaS application and help us continuously improve its architecture, performance, and reliability.

What you’ll do:

• Design, develop, and maintain product features across the backend and frontend of our Workflow and Automation solutions.
• Build and maintain backend services and RESTful APIs using Java, Spring Boot, TypeScript, and Node.js.
• Develop responsive and maintainable frontend functionality using React and modern state management solutions.
• Ensure high code quality through unit, integration, and end-to-end testing, code reviews, and collaborative problem-solving.
• Collaborate with Product Owners, Product Managers, UX/UI designers, and other development teams to deliver valuable product improvements.
• Contribute to the evolution of our SaaS architecture, supporting scalability, reliability, and the needs of thousands of tenants.
• Monitor, troubleshoot, and optimize application performance and reliability in production.
• Share knowledge, support teammates, and provide technical assistance to customers when needed.

What you'll need:

• Solid commercial experience with Java 17 and Spring Boot, including RESTful APIs, Spring Data JPA, and Spring Data JDBC.
• Strong practical experience with TypeScript and Node.js for backend development, serverless functions, or API resolvers.
• Strong frontend development experience with React 18, modern state management solutions such as Redux or TanStack Query, and routing libraries.
• Good understanding of software design principles, design patterns, and application architecture, including their trade-offs.
• Experience writing automated tests, including unit, integration, and end-to-end tests, using tools such as JUnit 5, Mockito, Vitest, and Playwright.
• Proficiency with Git, Maven, Docker, and a development IDE.
• Strong problem-solving skills, a hands-on approach, and the ability to collaborate effectively in an agile team.
• Good English communication skills (B2 level or higher), along with a willingness to learn and continuously develop professionally.

Benefits & Perks

Equity — Every Appfire team member is eligible for company equity, fostering a true sense of ownership and connection to our growth.

Time Off & Wellbeing

• 26 paid vacation days annually, regardless of tenure
• 12 Wellness Days — one fully paid day off each month to recharge, available on an ad-hoc basis and not carried over month to month
• 24 hours of paid volunteer time to support meaningful causes outside of work
• 3 fully paid volunteering days each year through Appfire Town, our Corporate Social Responsibility (CSR) program supporting local communities

Learning & Development —Grow with Appfire University — our custom, on-demand learning platform designed to support continuous learning and professional development.

Health & Lifestyle

• Private health insurance through UNIQA, fully covered by Appfire Bulgaria
• Multisport Card with access to hundreds of gyms, studios, and swimming pools across Bulgaria, fully paid by Appfie
• Food vouchers via a prepaid Pluxee lunch card with a monthly allowance

Transportation — Employees in Sofia receive a fully paid Sofia City Transport Card, providing access to all forms of public transportation within the city.

Family Support —Employees receive a one-time net Baby Bonus upon the birth of a child.

Flexibility — This role is fully remote within Bulgaria