Senior Backend Engineer -- Node.js/TypeScript

Job Description

We are looking for a hands-on Senior Backend Engineer — Node.js/TypeScript to build Our platform's application and API layer. You will own backend services, business logic, APIs, third-party integrations, asynchronous workflows, and application-level security and transaction controls. You will work closely with our Lead Full Stack Platform Engineers, Senior PostgreSQL Database Engineers, Frontend Developers, and product/architecture team. This is not an architecture-only role. We are looking for someone who designs systems and then builds them. What You'll Do Design and build production backend services using Node.js and TypeScript Build secure, well-defined and versioned REST APIs Implement authentication, authorization and role-based access controls Build tenant-aware services and enforce multi-tenant authorization boundaries Develop investor, issuer/property, onboarding, transaction, portfolio, wallet and marketplace backend workflows Integrate external KYC/KYB and identity providers Integrate with Fireblocks custody/wallet infrastructure Build payment, banking and other external service integrations Implement secure webhook ingestion, callback processing and external/internal ID mapping Design idempotent transaction workflows and protect against duplicate processing Implement retries, exponential backoff, rate-limit handling, reconciliation and failure recovery Build asynchronous workflows using queues/background jobs Implement Redis-based caching and other distributed application patterns where appropriate Work with the PostgreSQL Database Engineer on schema requirements, transaction boundaries and query patterns Use Prisma ORM while understanding when database-specific approaches are required Protect PII and financial data in transit and at rest Implement structured logging, monitoring and application observability Write unit, integration and API tests Participate in code reviews and establish maintainable backend engineering standards Work with AWS-based infrastructure and containerized deployments Required Qualifications 4–8+ years of professional backend software engineering experience Strong recent production experience with Node.js and TypeScript Strong experience designing and implementing production REST APIs Experience building authentication and authorization systems, including JWT/OAuth and RBAC Hands-on experience integrating complex third-party APIs involving: authentication/token management webhooks callbacks rate limits retries failure recovery Experience implementing idempotency for transactional APIs or workflows Solid PostgreSQL knowledge and experience working with relational databases Experience with Prisma, TypeORM or comparable ORM technology Experience with asynchronous/background processing Production experience with AWS and Docker Strong understanding of application security, secrets management and protection of sensitive data Experience with Git-based workflows, automated testing and CI/CD Preferred Fintech, payments, investment, digital assets or other regulated-platform experience KYC/KYB integrations such as Sumsub or equivalent Fireblocks or other institutional custody/wallet API experience Redis SQS, RabbitMQ, BullMQ, Kafka or similar messaging/queue technology AWS ECS, RDS, S3, IAM, Secrets Manager and CloudWatch OpenAPI/Swagger OpenTelemetry, Datadog, Grafana or similar observability tools Experience building multi-tenant SaaS platforms Experience using AI-assisted engineering tools such as Claude Code, Cursor or GitHub Copilot while independently reviewing and validating generated code What You Are Not Expected to Own You should be comfortable working with PostgreSQL, but you are not expected to be our PostgreSQL performance specialist . Advanced schema architecture, query-plan optimization and database performance engineering will be owned by the Senior PostgreSQL Database Engineer. Blockchain smart-contract development, including Solidity/ERC-3643, is a separate specialist function. What Success Looks Like You can take a business workflow such as investor onboarding or a transaction lifecycle, define the API and backend architecture, work with the database engineer on the data contract, implement it securely, integrate the required external services, test it, and take ownership of its behavior in production.