Senior Backend Engineer | Feeld

Accountabilities: You will play a key role in the development, optimization, and maintenance of backend systems, combining hands-on engineering with technical investigation and architectural contributions. Design, develop, and deploy scalable, resilient backend services using cloud-first architectures, NoSQL databases, and event-driven technologies. Investigate complex backend issues, lead technical troubleshooting, identify root causes, and define clear paths toward resolution. Optimize system performance, reliability, availability, and data integrity as the platform scales. Build and maintain well-structured, self-documented APIs using NestJS, GraphQL, and REST. Develop and maintain real-time application features using WebSockets. Contribute to architectural decisions and technical direction, working independently and taking ownership of complex initiatives. Collaborate with cross-functional teams, including Product Management and QA, to design, deliver, and improve high-quality features. Implement effective unit and integration tests to ensure code quality and system stability. Apply observability and monitoring practices to identify issues, track performance, and improve operational resilience. Develop a strong understanding of the product and its mobile-first environment to ensure backend solutions support user and business needs. Requirements The ideal candidate is an experienced backend engineer with strong Node.js expertise, a solid understanding of cloud infrastructure and distributed systems, and the ability to contribute independently in a collaborative product environment. At least 5 years of professional backend development experience using Node.js. Strong proficiency in TypeScript. Demonstrated experience building backend services and self-documented APIs with NestJS, using GraphQL and/or REST. Strong understanding of event-driven architectures, NoSQL databases, and cloud-native application development. Hands-on experience with AWS services, particularly ECS, DynamoDB, SQS, EventBridge, and PostgreSQL. Practical experience developing real-time features using WebSockets. Familiarity with observability and monitoring tools such as Sentry, Datadog, CloudWatch, and Amplitude. Experience writing reliable unit and integration tests. Previous experience in a mobile-first organization, with the ability to understand product requirements from an engineering perspective. Strong problem-solving and analytical skills, including the ability to investigate complex systems and work through technical challenges independently. Full professional proficiency in English. Strong collaboration and communication skills, with the flexibility to adapt to different working approaches. Additional experience that would be an advantage: Experience with Infrastructure as Code tools, particularly Terraform. Familiarity with specialized services and platforms such as Apollo, Firebase Authentication, Stream Chat, Cloudflare, and Snowflake. Knowledge of globally distributed systems and large-scale application architecture. Interest or experience in machine learning and AI-powered recommendation engines. A test-driven mindset, with an emphasis on automation, efficiency, and continuous improvement. Familiarity with mobile development technologies, particularly React Native. Benefits Health insurance: Access to health coverage. Well-being support: Dedicated well-being coverage. Sports benefits: Sport coverage to support an active lifestyle. Learning budget: Financial support for continuous learning and professional development. Paid vacation: Paid annual leave. Paid sick leave: Time off to recover when needed. Public holidays: All public holidays are paid days off. Remote working: Work remotely as part of an international, distributed team. Integrated team experience: Work directly with the client's team, using its tools and technologies and collaborating closely with its members. Long-term collaboration: Join an extended-team model designed around projects that can last several years. Team connection: Opportunities to participate in client visits, team-building activities, and informal team events.