API Engineer II

Trepp•New York, NY

4d•Hybrid

About The Position

As a Software Engineer II – API Engineering, you will design, develop, and optimize RESTful APIs and backend services that power Trepp’s enterprise-grade platforms. You’ll work primarily in TypeScript/JavaScript and focus on building performant, scalable, and reliable systems. This role emphasizes strong backend engineering fundamentals, efficient coding practices (time/space complexity), and leveraging Node.js/TypeScript’s event-driven runtime for reactive and asynchronous workflows.

Requirements

5+ years total professional software engineering experience.
3+ years backend engineering experience building production services in TypeScript and JavaScript, with strong proficiency.
Must-have: Proven RESTful API design/development experience with strong command of HTTP methods and HTTP status codes.
Strong understanding of Node.js/TypeScript asynchronous and event-driven runtime behavior (non-blocking I/O, concurrency patterns).
Demonstrated ability to write efficient code and reason about performance using time/space complexity concepts.
Proficiency with PostgreSQL and Redis, plus experience with at least one NoSQL datastore (DynamoDB or MongoDB).
Experience integrating with external APIs, including reliability patterns (timeouts, retries, rate limiting) and secure handling of credentials/secrets.
Strong debugging skills and familiarity with observability fundamentals (logging, metrics, tracing).

Nice To Haves

Experience with AWS (e.g., Lambda, API Gateway, SQS/SNS, EventBridge, DynamoDB, CloudWatch, ECS/EKS).
Experience with event-driven architectures and asynchronous messaging patterns (pub/sub, queues, eventual consistency).
Experience with serverless computing and understanding of operational/performance tradeoffs (cold starts, concurrency limits, cost considerations).
Familiarity with containerization and CI/CD (e.g., Docker, GitHub Actions).
Familiarity with infrastructure-as-code and deployment tooling (e.g., Terraform, Serverless Framework).
OpenAPI Specification (Swagger) documentation experience for API definition, documentation, and collaboration.
Familiarity with observability tooling (e.g., OpenTelemetry, Datadog, CloudWatch, ELK/OpenSearch) and API security best practices.

Responsibilities

Design, implement, test, and maintain RESTful APIs and backend services using TypeScript/JavaScript (Node.js).
Apply API design best practices: consistent resource modeling, validation, pagination, error handling, versioning, and backward compatibility.
Implement secure authentication/authorization patterns as needed (e.g., JWT, OAuth2, API keys, RBAC).
Write efficient, production-quality code with clear awareness of time and space complexity, choosing appropriate data structures and algorithms.
Identify and resolve performance bottlenecks (latency, throughput, memory usage) through profiling and targeted optimization.
Apply caching and data-access optimization patterns to improve responsiveness and reduce load (e.g., leveraging Redis appropriately).
Build services that leverage the event-driven nature of Node.js/TypeScript, including async/await, streaming, and message-based workflows.
Implement resilient asynchronous patterns (idempotency, retries, backoff, dead-letter handling where applicable).
Ensure workflows are observable and debuggable through structured logs, metrics, and tracing.
Design and implement storage strategies and access patterns across data stores, including: Relational: PostgreSQL (schema design, query optimization, migrations) Cache/Key-Value: Redis (TTL, invalidation strategies, cache-aside patterns) NoSQL: experience with at least one of DynamoDB (key design and access patterns) OR MongoDB (document modeling)
Make pragmatic tradeoffs around consistency, transactions, performance, and maintainability.
Integrate with third-party/external APIs and internal services with strong handling of timeouts, retries, rate limits, and circuit breakers.
Design for schema evolution and backward compatibility when upstream providers change.
Follow secure secret management and credential rotation practices; build maintainable, testable adapters/clients.
Participate in code reviews and contribute to team standards for readability, maintainability, and reliability.
Write unit/integration tests and support CI/CD pipelines to enable fast, safe deployments.
Partner with product, QA, and other engineering teams to deliver high-quality solutions.

Benefits

Base + target bonus compensation structure
Medical, Dental, Vision insurance
401K (with employer match)
Student Debt Retirement Plan
Life insurance, long term disability, short term disability all covered by the company
Flexible paid time off (PTO)
Sixteen (16) weeks paid primary caregiver leave (Biological, adoptive, and foster parents are all eligible)
Four (4) weeks paid parental leave
Pet insurance
Laptop (company issued) + WFH equipment reimbursement
Career progression plan
Pre-tax commuter benefit with company subsidy (For NYC-office based employees only)
Involvement in Diversity and Inclusion programs
Fun company events and volunteering opportunities