Senior Backend Engineer - Node + Prisma for Multi-Tenant SaaS

KLEES; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

KLEES is seeking a senior backend engineer to own core services for a multi-tenant SaaS platform. You will design APIs, model relational data, implement asynchronous workflows, and ensure security and reliability across deployment and alerting pipelines.

You'll lead API design with Fastify, TypeScript, and Prisma, manage migrations in MariaDB/MySQL, and strengthen background processing with BullMQ and Redis, while driving observability and security reviews with the team.

Qualifications

• At least 5 years of production Node.js backend experience in SaaS.
• Strong SQL fundamentals with MariaDB/MySQL or PostgreSQL.
• Experience designing isolation controls for multi-tenant data (row-level security).
• Ability to own a service across its lifecycle from schema design to deployment.

Responsibilities

• Design and deliver API endpoints using Fastify, TypeScript, and Prisma.
• Maintain database schemas and reliable migration workflows for MariaDB or MySQL.
• Build and strengthen background job workers using BullMQ and Redis.
• Manage service observability through structured logs, metrics, and error budgets.
• Lead security reviews for new features and coordinate with security leadership on audits.

Skills

Node.js

TypeScript

SQL

SaaS

Multi-tenant design

Tools

Prisma

Fastify

BullMQ

Redis

MariaDB

MySQL

PostgreSQL

Job description

KLEES is seeking a senior backend engineer to own core services for a multi-tenant SaaS platform. You will design APIs, model relational data, implement asynchronous workflows, and ensure security and reliability across deployment and alerting pipelines.

You'll lead API design with Fastify, TypeScript, and Prisma, manage migrations in MariaDB/MySQL, and strengthen background processing with BullMQ and Redis, while driving observability and security reviews with the team.