Senior Node.js Backend Engineer

We are looking for a Senior Backend Engineer to join the Core Banking Services team and help build and scale a high-performance Banking-as-a-Service (BaaS) platform. We build and scale the high-performance, serverless API layer that empowers both internal consumers and partner banks to manage customers and their accounts. As a pure backend engineering team, we don't build UI components. Instead, we focus entirely on engineering robust, highly available, and secure distributed services. The team owns the end-to-end lifecycle of core banking entities, including: - Identity & Compliance: Automated customer onboarding and complex KYC workflows. - Ledger & Accounts: Scalable deposit account management systems. - Reporting: High-throughput data processing for reporting obligations, observability, and account statement generation. Responsibilities: - Build and maintain the BaaS API services, including REST API and event-driven systems with a serverless architecture that other teams and partners depend on, making sure they're reliable and accurate. - Help shape how we solve problems: contribute ideas on how things should be built, weigh in on important decisions, and make sure we're building things the right way for the long term. - Keep our CI/CD processes healthy: spot when things are slow or breaking, and take action to make the team's day-to-day smoother and faster. - Drive architectural decisions and solution design within your domain, including writing technical solution designs, participating in threat modeling workshops, and collaborating cross-team on upstream/downstream dependencies. - Take ownership of production reliability by participating in an On-Call rotation, leading incident investigations, identifying root causes, and driving hotfixes, as the team does with live incidents on the platform. - Work with external partners and services we connect to, and take ownership when something on their side needs following up or resolving. - Keep our build, testing, and release processes healthy: spot when things are slow or breaking, and take action to make the team's day-to-day smoother and faster. Must have: - Minimum 5 years of hands-on experience as a backend engineer, with at least 2 years of NodeJs/TypeScript experience. - Highly responsible for working with critical high-core value systems for the company. - Solid experience with AWS Serverless services - Lambda, SQS, API Gateway, EventBridge, DynamoDB, S3. - Solid understanding and practical application of design patterns - Hands-on experience with Infrastructure as Code (preferably Terraform & CDK). - Hands-on experience with TypeScript testing practices (unit, integration, system testing). - Experience with event-driven architectures (e.g., Kafka) - Familiarity with RESTful API design and OpenAPI specifications. Soft skills: - Excellent communication skills. Ability to articulate challenges and solutions clearly. - Proven team player. Collaborates well with others and supports shared goals. - Critical thinking and problem-solving capabilities; able to design robust solutions and analyze production issues. - Proactiveness in supporting teammates and driving technical improvements. - Fluency in English. Good to have: -  Experience working in a monorepo setup (pnpm workspaces or similar). - Experience with Relational Databases (MySQL) and an ORM such as Prisma. - Experience with NoSQL databases (e.g., DynamoDB or similar) - German-language skills are a plus but not mandatory. We offer*: - Flexible working format - remote, office-based or flexible - A competitive salary and good compensation package - Personalized career growth - Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) - Active tech communities with regular knowledge sharing - Education reimbursement - Memorable anniversary presents - Corporate events and team buildings - Other location-specific benefits *not applicable for freelancers