Backend Software Engineer
On-site
Full Time
#Fintech
#Payments
#Software Engineering
#NestJS
#TypeScript
#MySQL
#AWS
#GraphQL
#REST API
#Docker
#CI CD
#JWT
#OAUTH2
At Scalapay, we’re shaping a culture with high standards, independent and critical thought, innovation, ownership, and continuous learning. We operate in a fast-moving, tech-driven environment, and we’re looking for people who thrive in change, think boldly, and take initiative.
If you’re ready to put your potential to the test in a hiring process designed to spotlight exceptional talent, this is your chance to stand out and grow with one of Europe’s most ambitious fintech teams.
#MakeItHappen #PlayAsATeam #StayCurious #FocusOnCustomer.
The Mission
We'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 & Performance
- Design, build, and maintain high-quality REST APIs using NestJS framework
- Optimize API performance through caching strategies, query optimization, and payload compression
- Implement rate limiting, pagination, and filtering for scalable data handling
- Ensure APIs meet performance benchmarks with sub-200ms response times
Security & Compliance
- Implement robust authentication and authorization systems (JWT, OAuth2, multi-factor authentication)
- Apply security best practices including input validation, SQL injection prevention, and XSS protection
- Ensure PCI DSS compliance for payment processing and sensitive data handling
- Implement API security measures including HTTPS/TLS, API key management, and request signing
- Design secure data encryption at rest and in transit
Backend Architecture
- Develop scalable, maintainable backend services using NestJS with TypeScript Design and implement microservices architecture patterns
- Apply dependency injection, modular architecture, and clean code principles
- Build event-driven systems and real-time features using WebSockets
Database & Cloud Infrastructure
- Work with MySQL databases, optimizing queries and implementing proper indexing
- Design efficient database schemas and manage migrations
- Deploy and manage applications on AWS infrastructure
- Implement containerization with Docker and CI/CD pipelines
- Monitor system performance and implement logging/tracing solutions
Required Qualifications:
Technical Skills
- 5+ years of backend development experience
- 3+ years hands-on experience with NestJS and TypeScript/JavaScript
- Strong proficiency in MySQL database design, optimization, and query performance
- Extensive 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 practices
Performance & Security Focus
- Demonstrated experience in API performance optimization and bottleneck identification
- Knowledge of caching strategies (Redis, Memcached, HTTP caching)
- Experience with database query optimization and indexing strategies
- Strong background in API security including authentication, authorization, and data protection
Development Practices
- Experience with Git version control and collaborative development workflows
- Knowledge 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 assessments
- Experience with agile development methodologies
What We're Looking For:
- Performance-minded developer who naturally thinks about optimization and scalability
- Security-conscious professional who prioritizes secure coding practices and compliance
- Strong problem-solver who can identify and resolve API bottlenecks and security vulnerabilities
- Collaborative team player comfortable with code reviews and knowledge sharing
- Detail-oriented professional who values code quality, maintainability, and security
- Continuous learner who stays current with backend development and security best practices
Why you should join Scalapay:
- International environment with significant challenges to be met every day
- Lots of opportunities to work with a team of industry tech leaders who are focused on delivering products that offer exceptional user experiences
- Personalised support to accelerate your professional growth and take ownership of the products you deliver: we want to help you grow!
- Latest technologies and being encouraged to bring your flair to the role.
Recruitment Process:
- A quick chat with one of our Talent Acquisition team members
- The first interview with the Hiring Manager to dive deep into your experiences and better understand your motivation
- A case study to test your hard skills
- A final chat with Simone, our CEO
Want 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.
