Humoniq is seeking a Senior Backend Engineer to power modern travel search, booking, and management experiences. As a YC-backed startup with $8M+ raised, we're building deeply integrated AI systems for travel and transport. You will design and implement backend services integrating with GDS, NDC, and other travel APIs, aggregating fares and inventory into a unified platform.

What You'll Do

Build the core systems that power travel search, booking, and management.
Design, build, and maintain robust backend services in Go/Golang with a focus on scalability, reliability, and performance.
Integrate with GDS, NDC, and other third-party travel APIs, handling search, booking, and post-booking workflows for flights, hotels, and related services.
Apply strong engineering principles (modularity, testing, error handling, monitoring) to ensure resilience against external API dependencies.
Collaborate closely with product and leadership to ensure backend capabilities align directly with customer and business needs.
Take full ownership of outcomes in a startup environment: small team collaboration, rapid iteration, and shipping usable systems.

What We're Looking For

Prior experience with travel and Global Distribution System (GDS) is REQUIRED.
Strong, validated expertise in software engineering with expertise in shipping production systems from beginning to end.
Deep expertise in Go/Golang with a demonstrated 3 years of backend engineering experience.
Strong understanding of distributed systems, concurrency, and microservices.
Experience working with databases, especially MySQL.
Proven ability to pick up new technologies quickly and apply them pragmatically.
Ability to turn messy, ambiguous problems into solvable projects, with clear scoping, regular updates, and visible progress for stakeholders.
Excellent communication: clearly defines projects, can explain assumptions, trade-offs, and progress clearly.

Nice to Have

Familiarity with Vercel, Docker, Kubernetes, and cloud platforms (AWS/GCP).
Experience in high-growth startups.
Previous founders or founding engineers.

Technical Stack

Go/Golang
MySQL
GDS
NDC
Vercel
Docker
Kubernetes
AWS/GCP

Team & Environment

You will join a small team collaborating closely with the COO and three other engineers (AI, frontend and backend). You'll take strategic and product guidance from a cofounder. We work in a lightweight agile framework with daily stand-ups and project coordination focused on results tied to business and customer outcomes.