About the role

Role Overview

Join Sundayy as a Full Stack Developer specializing in JavaScript to build and maintain web applications. You’ll work with product, design, and operations to deliver efficient, scalable, and user-friendly software in a fast-growing startup environment.

Responsibilities

Design, develop, and maintain scalable full-stack web applications
Build user interfaces with React, Next.js, and TailwindCSS
Integrate GraphQL APIs and manage application data flow
Write and maintain automated tests to ensure reliability and code quality
Collaborate with product managers, designers, and engineers to deliver seamless user experiences
Participate in code reviews, team meetings, and Agile development processes
Maintain and optimize database schemas, queries, and ORM integrations
Implement authentication and authorization features to secure applications
Stay current with industry trends and best practices

Requirements

Bachelor’s degree in Computer Science (or related field)
5+ years hands-on experience with JavaScript, TypeScript, HTML5, CSS3, and React/Context API
3+ years with Next.js (including App Router)
Experience with GraphQL and Apollo
Proficiency with TailwindCSS
Version control experience with Git (GitHub/GitLab)
Testing experience with Playwright, Cypress, Jest, and React Testing Library
Relational database knowledge: PostgreSQL and/or MySQL
ORM experience using Prisma or Drizzle
Authentication solutions experience: Cognito, Auth0, or NextAuth.js
Strong communication skills and a team/service-oriented mindset

Nice to Have

Demonstrated passion for continuous learning and adopting new technologies

About Sundayy

Codekeeper (established by industry professionals) is focused on transforming the software escrow landscape for the cloud era. The company delivers disaster recovery solutions that help mitigate third-party operational risks. It operates as a remote-first organization with a central office in The Hague and emphasizes innovation and continuous improvement.