Senior Backend Software Engineer – APIs

Senior Backend Software Engineer – APIs New York City – 4 days onsite $190,000 – $210,000 base + Equity We are searching for a Senior Backend Software Engineer to join a really awesome team in NY to help develop and scale its booking platform and external APIs.

The company operates a global marketplace with over almost 3000 hotel partners across 30 countries , serving more than 7 million customers - and there is no sign of slowing down. They're now expanding their platform to support new booking experiences, third-party integrations and AI-powered booking capabilities.

This is a hands-on engineering role where you'll take ownership of a critical API platform, tackling complex challenges involving transactional systems, inventory management, distributed systems and reliability.

What You'll Be Doing

• Design, build and maintain scalable backend services and REST APIs.
• Develop APIs covering pricing, availability, reservations, booking changes and cancellations.
• Solve complex problems involving concurrency, idempotency, retries and distributed system failures.
• Improve and scale existing Ruby on Rails and PostgreSQL applications.
• Build integrations with third-party booking platforms, hotel management systems and external partners.
• Develop reliable systems to prevent duplicate bookings and inventory inconsistencies.
• Work closely with Staff Engineers on architecture and technical decisions.
• Improve system performance, testing, monitoring and reliability.

What We're Looking For

• 6+ years of backend software engineering experience.
• Strong experience developing backend applications and REST APIs.
• Experience with backend technologies.
• Strong knowledge of SQL databases, ideally PostgreSQL.
• Experience designing transactional systems or complex integration platforms.
• Good understanding of distributed systems, concurrency and asynchronous processing.
• Experience working with AWS or similar cloud platforms.
• Comfortable taking ownership of technical projects while remaining hands-on.

Nice to Have

Experience with marketplaces, booking systems, payments or e-commerce. Knowledge of OpenSearch, MongoDB, webhooks or OpenAPI. Experience building third-party integrations.

Ruby on Rails experience is beneficial but not essential. Strong backend engineers from other technology backgrounds are welcome. What's on Offer? $190,000 – $210,000 base salary + equity High-impact engineering role with genuine technical ownership.

Opportunity to work on complex, large-scale transactional systems. Direct collaboration with senior engineering leadership. Clear progression opportunities towards Staff Engineer.

Health, dental and vision insurance. 401(k), unlimited PTO, and paid parental leave. If you're an experienced backend engineer based in New York (or open to relocating) who enjoys building scalable APIs and solving complex technical challenges, I'd be happy to share more details.

Feel like you're up to the challenge? We look forward to speaking with you.