Senior Backend Developer

OpenKrill; United States; On-site; USD 110,000 - 190,000; Full time

Benefits offered by this job

Flexible hours

Hybrid/remote work options

Private health insurance

Paid time off

Mac hardware

Job summary

xpate is hiring a hands-on Backend Developer to build and ship production serverless services for a fintech platform. You will design REST APIs, model data in DynamoDB and PostgreSQL, and ship event-driven workflows using SQS, EventBridge, and Step Functions.

This role emphasizes observability with Winston logging and AWS X-Ray tracing, testing with Mocha and Sinon, and clean code practices. You’ll work TypeScript/Node.js in Lambda-first microservices, with flexible hours and hybrid/remote

Qualifications

• Hands-on backend engineering in TypeScript/Node.js.
• Production AWS experience, Lambda-first architecture.
• Ability to ship fast with strong engineering fundamentals.

Responsibilities

• Build and evolve Lambda-first microservices for real money flows.
• Design REST APIs with type-safe schemas and durable contracts.
• Model data in DynamoDB and use PostgreSQL when relational fits.
• Ship event-driven workflows with SQS/EventBridge/Step Functions.
• Ensure observability with structured logging and distributed tracing.

Skills

TypeScript

Node.js

Backend development

REST APIs

Testing with Mocha/Sinon

Observability/logging

Tools

Serverless Framework

Middy

Terraform

GitHub Actions

AWS X-Ray

Winston

Zod

Luxon

DynamoDB

PostgreSQL

Job description

We’re hiring a hands‑on Backend Developer to build and ship production serverless services for a fintech platform.

Tech stack

• - Languages: TypeScript, Node.js (18–22)
• - AWS: Lambda, DynamoDB, S3, SQS, EventBridge, Step Functions
• - Databases: DynamoDB, PostgreSQL
• - Frameworks / middleware: Serverless Framework, Middy
• - Libraries: Zod (schemas/validation), Winston (logging), AWS X-Ray (tracing), Luxon (dates)
• - Testing: Mocha, Sinon
• - Tooling: ESLint, Prettier, Terraform, GitHub Actions

Your role at xpate:

Build and evolve Lambda-first microservices that handle real money flows and integrations.

• - Design REST APIs with type-safe schemas (Zod) and contracts that don’t rot.
• - Model data in DynamoDB (access patterns first) and use PostgreSQL when relational fits better.
• - Ship event-driven workflows with SQS/EventBridge/Step Functions: retries, idempotency, dead-letters, backpressure.
• - Ensure observability: structured logging (Winston), distributed tracing (AWS X-Ray), actionable metrics.
• - Write tests that protect releases (Mocha/Sinon), keep quality bars high, and reduce regressions.

We’re ready to meet you, if…

• - You have strong hands‑on backend engineering experience in TypeScript / Node.js.
• - You have real AWS production experience — not “used Lambda once”, but built, operated, debugged, and fixed systems in production.
• - You have the ability to ship fast without trashing quality: clean code, predictable delivery, and solid engineering fundamentals.
• - You use AI tools daily to accelerate output (coding, debugging, analysis) and improve outcomes.
• - You have English at B2+ level (the team is English-speaking).

What working at xpate looks like:

• A competitive salary (depending on what you bring).
• Everything you need to succeed, with flexibility built in — from flexible hours and hybrid/remote work options to private health insurance and paid time off.
• Top‑of‑the‑line Apple gear to fuel your work.
• A workspace designed for focus and collaboration.
• Ownership of your work end‑to‑end, with the freedom to move fast and make a real impact.
• Celebrated wins, opportunities to grow and a culture where voices are heard and chances to grow are ever-present.

Why join xpate?

We're building the financial backbone of the future, where payments move freely and businesses thrive without barriers. If you want real impact, freedom to innovate, and work that drives change - xpate is the place for you.