Senior Backend Software Engineer - Consumer Banking
pAt Scalapay, we’re shaping a bculture /b with high standards, independent and critical thought, binnovation, ownership, and continuous learning /b. We operate in a bfast-moving, tech-driven environment /b, and we’re looking for people who bthrive in change, think boldly, and take initiative. /b /p pIf you’re ready to bput your potential to the test /b in a hiring process designed to spotlight exceptional talent, this is your chance to stand out and grow bwith one of Europe’s most ambitious fintech teams /b. /p p#MakeItHappen #PlayAsATeam #StayCurious #FocusOnCustomer. /p h3bThe Mission /b /h3 pScalapay is an AI-first international fintech. We’re looking for a bBackend Software Engineer /b with banking platform experience to join our Consumer Banking team. You’ll design and deliver high-performance, secure and scalable APIs that power our customer experience. You’ll work spec-first: you define what good looks like, and AI coding agents help you build it faster without lowering the bar on quality, security or compliance. /p h3bKey Responsibilities: /b /h3 h3AI-First Engineering /h3 ul liWrite clear specifications and technical designs that AI coding agents (e.g. Claude Code) implement from, then direct, review and test their output; /li liTake full ownership of AI-generated code, making sure it meets our standards for security, performance and PCI DSS compliance before it ships; /li liUse AI across the whole development lifecycle: test generation, code review, documentation, debugging and incident analysis; /li liHelp shape the team’s AI tooling, shared context, prompts and guardrails so that development becomes more automated over time. /li /ul h3API Development Integration /h3 ul liDesign, build and maintain high-quality REST APIs using NestJS and TypeScript; /li liMeet performance targets of under 200ms response time through caching, query optimisation, payload compression, rate limiting,
pagination and filtering; /li liIntegrate with external services and banking partners, keeping the platform resilient to third‑party failures. /li /ul h3Architecture /h3 ul liBuild scalable, maintainable microservices using dependency injection, modular design and clean code principles; /li liDevelop event-driven systems and real‑time features. /li /ul h3Security Compliance /h3 ul liImplement authentication and authorisation (JWT, OAuth2, MFA) and API security measures (TLS, API key management, request signing); /li liApply secure coding practices, including input validation and protection against SQL injection and XSS; /li liEnsure PCI DSS compliance and encryption of sensitive data at rest and in transit. /li /ul h3Data Infrastructure /h3 ul liDesign efficient MySQL/PostgreSQL schemas, manage migrations and optimise queries and indexing; /li liDeploy on AWS with Docker, EKS, and CI/CD pipelines, working with DevOps on infrastructure requirements; /li liMonitor system performance through logging, tracing and alerting. /li /ul h3Required Qualifications /h3 ul li5+ years of backend development experience, including banking platforms, system integrations and ledgers /li li3+ years with NestJS and TypeScript, or comparable frameworks and languages /li liProven AI spec-driven development: you’ve shipped production software by specifying, directing and validating the work of AI coding agents /li liStrong MySQL and/or PostgreSQL skills: schema design,
query optimisation and indexing /li liDeep knowledge of REST API design, plus GraphQL experience (code-first and schema-first) /li liTrack record of finding and fixing API performance bottlenecks, including caching (Redis, Memcached, HTTP caching) /li liStrong API security background: authentication, authorisation, encryption, security testing and vulnerability assessment /li liExperience with AWS (EC2, RDS, Lambda, API Gateway, CloudWatch) or a comparable cloud platform /li liSolid testing practice (Jest, unit and integration testing), Git workflows and agile delivery /li /ul h3bWhat We’re Looking For /b /h3 ul libBanking platform experience. /b You’ve built or worked on banking systems, including system integrations and ledgers. /li libAn AI-first builder. /b You can show us AI projects that demonstrate your spec-driven way of working, and you have good judgement about when to trust AI output and when to challenge it. /li libAn owner. /b You think about performance, scalability and security by default, not as an afterthought. /li libA collaborator. /b You’re comfortable with code reviews and enjoy sharing what you learn, including the AI workflows that work for you. /li libA continuous learner. /b You keep up with backend, security and AI-assisted engineering practices. /li /ul h3bWhy Join Scalapay /b /h3 ul liAttractive packages based on skills and experience, the salary band we have for this position is of EUR 65’000 - 80’000 (Gross Annual Salary); /li liAn international fintech with an AI-first approach, raising the bar daily on how we build software and solve complex problems /li liWork alongside industry tech leaders focused on exceptional user experiences /li liPersonalised support to grow your career and take ownership of the products you deliver /li liModern technology and the freedom to bring your own flair /li /ul #J-18808-Ljbffr
pagination and filtering; /li liIntegrate with external services and banking partners, keeping the platform resilient to third‑party failures. /li /ul h3Architecture /h3 ul liBuild scalable, maintainable microservices using dependency injection, modular design and clean code principles; /li liDevelop event-driven systems and real‑time features. /li /ul h3Security Compliance /h3 ul liImplement authentication and authorisation (JWT, OAuth2, MFA) and API security measures (TLS, API key management, request signing); /li liApply secure coding practices, including input validation and protection against SQL injection and XSS; /li liEnsure PCI DSS compliance and encryption of sensitive data at rest and in transit. /li /ul h3Data Infrastructure /h3 ul liDesign efficient MySQL/PostgreSQL schemas, manage migrations and optimise queries and indexing; /li liDeploy on AWS with Docker, EKS, and CI/CD pipelines, working with DevOps on infrastructure requirements; /li liMonitor system performance through logging, tracing and alerting. /li /ul h3Required Qualifications /h3 ul li5+ years of backend development experience, including banking platforms, system integrations and ledgers /li li3+ years with NestJS and TypeScript, or comparable frameworks and languages /li liProven AI spec-driven development: you’ve shipped production software by specifying, directing and validating the work of AI coding agents /li liStrong MySQL and/or PostgreSQL skills: schema design,
query optimisation and indexing /li liDeep knowledge of REST API design, plus GraphQL experience (code-first and schema-first) /li liTrack record of finding and fixing API performance bottlenecks, including caching (Redis, Memcached, HTTP caching) /li liStrong API security background: authentication, authorisation, encryption, security testing and vulnerability assessment /li liExperience with AWS (EC2, RDS, Lambda, API Gateway, CloudWatch) or a comparable cloud platform /li liSolid testing practice (Jest, unit and integration testing), Git workflows and agile delivery /li /ul h3bWhat We’re Looking For /b /h3 ul libBanking platform experience. /b You’ve built or worked on banking systems, including system integrations and ledgers. /li libAn AI-first builder. /b You can show us AI projects that demonstrate your spec-driven way of working, and you have good judgement about when to trust AI output and when to challenge it. /li libAn owner. /b You think about performance, scalability and security by default, not as an afterthought. /li libA collaborator. /b You’re comfortable with code reviews and enjoy sharing what you learn, including the AI workflows that work for you. /li libA continuous learner. /b You keep up with backend, security and AI-assisted engineering practices. /li /ul h3bWhy Join Scalapay /b /h3 ul liAttractive packages based on skills and experience, the salary band we have for this position is of EUR 65’000 - 80’000 (Gross Annual Salary); /li liAn international fintech with an AI-first approach, raising the bar daily on how we build software and solve complex problems /li liWork alongside industry tech leaders focused on exceptional user experiences /li liPersonalised support to grow your career and take ownership of the products you deliver /li liModern technology and the freedom to bring your own flair /li /ul #J-18808-Ljbffr