Backend Engineer | Senior | Go | Product & Startup Experience | Saily

At Saily, we're removing the hassle of staying connected while traveling — no roaming fees, no plastic SIM cards, just lightning-fast, secure mobile data in 200+ destinations. Millions of paying customers trust us, and hundreds of thousands of travelers browse Saily at any given moment.
We're not looking for someone to close tickets. We're looking for a builder — someone who has shipped products real people use, felt the pain of a 2 AM incident on something they care about, and gets a kick out of seeing a metric move because of something they built.

Our Culture: AI-native Product Engineering

• The Engineer is the builder — responsible for solving customer problems end-to-end, from idea to production

• AI Agents are the enablers — they write most of the code and handle repeatable tasks, so you maximize your impact

• Everyone makes Saily more effective — you suggest what to delegate to agents, then implement the changes

• Curiosity, learning, and sharing are everyone's job

• The customer — a traveler on a comfortable, connected, hassle-free journey — never leaves our focus

We value growth over comfort, contribution over hierarchy, and impact over process. We give sharp people context, autonomy, and AI as their multiplier — and expect their best work in return.

Main Responsibilities

• Own product features end-to-end: from shaping the idea with Product and Design to shipping, measuring, and iterating

• Build features supporting multi-dimensional personalization, A/B experimentation, and analytics

• Make technical decisions with a product lens — you'll know the "why" behind every "what"

• Develop and maintain a high-quality, high-performance codebase in Go

• Mentor colleagues and raise the bar on engineering best practices

• Influence your team's vision and long-range goals — your opinion on what we build matters as much as how

• Run R&D spikes when the path forward isn't obvious

• Collaborate across engineering, product, and design in a cross-functional team

Requirements

• 5+ years of backend development experience, with strong skills in Python, PHP, Ruby, or similar — and readiness to work in Go daily

• Product company experience, ideally startup or scale-up — you've worked where speed, ambiguity, and ownership are the norm, not the exception

• B2C experience strongly preferred — you understand what it means to build for millions of users you'll never meet, where small UX details and performance directly hit revenue and retention