Backend Engineer

Backend Engineer Join us in building the backend that powers world-class creativity apps used by millions of people. Appostrophe is a Stockholm-based mobile app studio creating easy-to-use design tools that unlock people's creativity. Our flagship app SCRL is a top-ranked design tool for social media content creation, used and loved by millions worldwide. We're a small, ambitious team expanding our platform to the web, and we need a talented Backend Infrastructure Engineer to build the foundation that will power this growth. You'll be joining our data team to architect and build the backend systems that enable SCRL's expansion to the web, focusing on user accounts, subscription management, and cross-platform data synchronization. What you will do Core Infrastructure & APIs Design and build robust account systems supporting, among others, email/password authentication and cross-platform user management. Develop and maintain RESTful APIs for user data, project storage, and subscription management. Implement secure authentication flows across web and mobile platforms. Build scalable storage solutions for user projects and account data. Strengthen our content delivery backend that returns templates, stickers and other content to all our platforms (iOS, Android, Web). Ensure scalability and stability of our backend across all platforms and platform versions. Support AI service delivery to the apps, such as our template recommendation system to suggest the right templates for our users. Subscription & Payment Systems Architect subscription management systems integrating with an external service for web payments. Implement subscription syncing across iOS, Android, and web platforms. Build subscription status validation and premium feature access controls. Develop subscription plan management (upgrades, downgrades, cancellations). Data Security & Compliance Implement GDPR-compliant data handling including consent management, data takeout, and deletion requests. Ensure secure backup systems and data integrity across platforms. Build audit trails for subscription and account changes. Maintain data structure consistency across web and mobile platforms. Platform Integration & Scaling Develop backend endpoints for mobile app account integration. Build systems for potential third-party integrations (Instagram connectivity, etc.). Optimize database performance and query efficiency for millions of users. Implement monitoring, logging, and error reporting systems. You should have Technical Expertise Backend Languages : Strong proficiency in Javascript, Typescript, React, or similar. Database Design : Experience with both SQL and NoSQL databases, understanding of data modeling for user accounts and subscriptions. API Development : Proven experience building RESTful APIs and understanding of API security best practices. Cloud Infrastructure : Experience with cloud platforms (AWS, GCP, or Azure) and infrastructure as code. System Design & Architecture Scalable Systems : Experience building systems that handle millions of users and high-throughput scenarios. Payment Integration : Knowledge of payment processing, subscription billing, and financial data handling. Security : Understanding of authentication, authorization, data encryption, and GDPR compliance requirements. Product & Business Understanding Subscription Apps : Experience with or strong interest in subscription-based app businesses and freemium models. Cross-Platform Thinking : Understanding of the complexities of syncing data and subscriptions across web, iOS, and Android. Data-Driven Approach : Comfortable working with analytics and ensuring proper event tracking for business insights. Collaboration & Communication Team Player : Ability to work closely with data engineers, frontend developers, and product teams. Clear Communication : Can explain complex technical concepts to non-technical team members. Problem Solving : Self-motivated with strong analytical and debugging skills. We offer High Impact Role : Your backend infrastructure will power millions of users' creative projects. Technical Growth : Opportunity to architect systems from scratch and work with modern technologies. Startup Environment : Fast-paced decision making with direct impact on product direction. Strong Team : Work alongside experienced data and engineering professionals in central Stockholm. Competitive Package : Market-rate salary with opportunities for professional development. Creative Culture : Be part of a profitable company that values creativity and user experience.