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