We are looking for a hands-on Senior Backend Engineer — Node.js/Type Script 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 Postgre SQL 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 Type Script

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 Postgre SQL 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 skilled backend software engineering experience

Strong recent production experience with Node.js and Type Script

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 Postgre SQL knowledge and experience working with relational databases

Experience with Prisma, Type ORM 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, Rabbit MQ, Bull MQ, Kafka or similar messaging/queue technology

AWS ECS, RDS, S3, IAM, Secrets Manager and Cloud Watch

Open API/Swagger

Open Telemetry, Datadog, Grafana or similar observability tools

Experience building multi-tenant Saa S platforms

Experience using AI-assisted engineering tools such as Claude Code, Cursor or Git Hub Copilot while independently reviewing and validating generated code

What You Are Not Expected to Own

You should be comfortable working with Postgre SQL, but you are not expected to be our Postgre SQL performance specialist. Advanced schema architecture, query-plan optimization and database performance engineering will be owned by the Senior Postgre SQL 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.

📌 Senior Backend Engineer — Node.js/typescript (Dona Paula)
🏢 MeridianSquare
📍 Dona Paula