Backend Software Engineer

At Scalapay, we're shaping aculturewith high standards, independent and critical thought,innovation, ownership, and continuous learning. We operate in afast-moving, tech-driven environment, and we're looking for people whothrive in change, think boldly, and take initiative.If you're ready toput your potential to the testin a hiring process designed to spotlight exceptional talent, this is your chance to stand out and growwith one of Europe's most ambitious fintech teams.#MakeItHappen #PlayAsATeam #StayCurious #FocusOnCustomer.The MissionWe're seeking a skilled Backend Software Engineer to join our Experiences team at Scalapay. You'll be responsible for building and maintaining high-performance, scalable REST APIs that power our user experience. This role focuses on delivering exceptional user experiences through robust backend architecture and optimized API performance.Key Responsibilities:API Development & PerformanceDesign, build, and maintain high-quality REST APIs using NestJS frameworkOptimize API performance through caching strategies, query optimization, and payload compressionImplement rate limiting, pagination, and filtering for scalable data handlingEnsure APIs meet performance benchmarks with sub-200ms response timesSecurity & ComplianceImplement robust authentication and authorization systems (JWT, OAuth2, multi-factor authentication)Apply security best practices including input validation, SQL injection prevention, and XSS protectionEnsure PCI DSS compliance for payment processing and sensitive data handlingImplement API security measures including API key management, and request signingDesign secure data encryption at rest and in transitBackend ArchitectureDevelop scalable, maintainable backend services using NestJS with TypeScript Design and implement microservices architecture patternsApply dependency injection, modular architecture, and clean code principlesBuild event-driven systems and real-time features using WebSocketsDatabase & Cloud InfrastructureWork with MySQL databases, optimizing queries and implementing proper indexingDesign efficient database schemas and manage migrationsDeploy and manage applications on AWS infrastructureImplement containerization with Docker and CI/CD pipelinesMonitor system performance and implement logging/tracing solutionsRequired Qualifications:Technical Skills5+ years of backend development experience3+ years hands-on experience with NestJS and TypeScript/JavaScriptStrong proficiency in MySQL database design, optimization, and query performanceExtensive experience with AWS services (EC2, RDS, Lambda, API Gateway, CloudWatch)Proven expertise in GraphQL API development (both code-first and schema-first approaches)Deep understanding of REST API design principles and best practicesPerformance & Security FocusDemonstrated experience in API performance optimization and bottleneck identificationKnowledge of caching strategies (Redis, Memcached, caching)Experience with database query optimization and indexing strategiesStrong background in API security including authentication, authorization, and data protectionDevelopment PracticesExperience with Git version control and collaborative development workflowsKnowledge of testing frameworks (Jest, unit testing, integration testing)Advanced understanding of security best practices (JWT, OAuth2, data encryption, secure coding)Experience with security testing and vulnerability assessmentsExperience with agile development methodologiesWhat We're Looking For:Performance-minded developer who naturally thinks about optimization and scalabilitySecurity-conscious professional who prioritizes secure coding practices and complianceStrong problem-solver who can identify and resolve API bottlenecks and security vulnerabilitiesCollaborative team player comfortable with code reviews and knowledge sharingDetail-oriented professional who values code quality, maintainability, and securityContinuous learner who stays current with backend development and security best practicesWhy you should join Scalapay:International environment with significant challenges to be met every dayLots of opportunities to work with a team of industry tech leaders who are focused on delivering products that offer exceptional user experiencesPersonalised support to accelerate your professional growth and take ownership of the products you deliver: we want to help you growLatest technologies and being encouraged to bring your flair to the role.Recruitment Process:A quick chat with one of our Talent Acquisition team membersThe first interview with the Hiring Manager to dive deep into your experiences and better understand your motivationA case study to test your hard skillsA final chat with Simone, our CEOWant to learn more? Don't hesitate to explore our Careers website, our LinkedIn and Glassdoor pages.Pro tip:send your CV in English ??Super Pro tip:we know that application processes can be scary and frustrating but... we look for talent, not people that tick all our boxes.We believe in the power of diversity: Scalapay is an Equal Opportunity Employer for any minority, disability, gender identity or sexual orientation.