Senior Backend Platform & API Engineer — Equity & Growth

Atrium; New York (NY); On-site; USD 190,000 - 210,000; Full time

Benefits offered by this job

Equity compensation.

Job summary

Atrium, a rapidly growing technology company, is seeking a Senior Software Engineer, Backend – Platform & API Development to design, build, and scale its core platform and external API infrastructure. You will own backend systems, API design, and transactional workflows across bookings, payments, and inventory.

The role is hands-on with significant technical ownership, offering opportunities to advance into Staff Engineer and to contribute to architectural decisions within a collaborative,

Qualifications

• 6+ years of professional software engineering experience in backend or platform development.
• Proven ability to design, develop, and deploy complex backend systems.
• Experience building external APIs and third-party integrations.
• Experience with transactional workflows involving payments, orders, bookings, or inventory.
• Strong relational database and data modeling skills.
• Solid CS fundamentals and problem-solving abilities.
• Experience in established engineering organizations with strong standards.
• Ability to own projects and drive architectural decisions.
• Excellent communication and collaboration abilities.
• Ability to work onsite in New York City four days per week.

Responsibilities

• Design, develop, and maintain scalable backend systems for a high-growth platform.
• Build and maintain external-facing APIs and third-party integrations.
• Develop transactional workflows for reservations, bookings, inventory, and payments.
• Own backend architecture, API design, and implementation decisions.
• Design relational database models emphasizing consistency and scalability.
• Collaborate with senior engineers on architecture and long-term strategy.
• Develop reusable patterns to support future platform integrations.
• Partner with product managers to translate requirements into technical solutions.
• Write, test, deploy, and maintain production-grade code.
• Identify opportunities to improve system performance and reliability.

Skills

Backend development

API design

Distributed systems

Payments and bookings flows

Data modeling

Communication

Education

Bachelor's degree

Tools

PostgreSQL

Ruby on Rails

Node.js

AWS

Redis

OpenSearch

Job description

Atrium, a rapidly growing technology company, is seeking a Senior Software Engineer, Backend – Platform & API Development to design, build, and scale its core platform and external API infrastructure. You will own backend systems, API design, and transactional workflows across bookings, payments, and inventory.

The role is hands-on with significant technical ownership, offering opportunities to advance into Staff Engineer and to contribute to architectural decisions within a collaborative,