Senior Backend Engineer — Go, Product and Startup Experience

Details

Saily is looking for a senior backend engineer to build product features used by millions of travelers across more than 200 destinations. The role involves end-to-end product ownership, from shaping ideas with Product and Design through shipping, measuring, and iterating in production. Saily follows an AI-native product engineering approach in which engineers use AI agents to maximize their impact while maintaining ownership of customer outcomes.

Responsibilities

• Own product features end-to-end, from idea development with Product and Design through shipping, measurement, and iteration.
• Build features supporting multi-dimensional personalization, A/B experimentation, and analytics.
• Make technical decisions with a product-focused perspective.
• Develop and maintain a high-quality, high-performance codebase in Go.
• Mentor colleagues and improve engineering best practices.
• Influence team vision and long-term goals.
• Run R&D spikes when the path forward is unclear.
• Collaborate across engineering, product, and design in a cross-functional team.

Requirements

• 5+ years of backend development experience.
• Strong experience with Python, PHP, Ruby, or similar, and readiness to work with Go daily.
• Experience in a product company, ideally a startup or scale-up.
• B2C experience is strongly preferred.
• Solid system design skills and the ability to select appropriate patterns.
• Experience with SQL databases such as MySQL and PostgreSQL.
• Experience with NoSQL solutions such as Redis and Cassandra.
• Experience with Kafka or similar event-driven systems.
• Passion for building simple, easy-to-use APIs.
• A collaborative mindset and willingness to rethink and redesign ideas toward shared success.

Bonus Points

• Experience building a personal product, startup, indie app, or side project used by real users.
• Experience with Kubernetes and microservice architecture.
• A track record of shipping experiments, testing hypotheses, and measuring impact.
• Comfort working with AI-native tools such as Claude Code, OpenAI Codex, and Cursor.

Tools and Technologies

• Backend: Go, MySQL, Kafka, Docker, Kubernetes, AWS, Redis.
• Frontend: Next.js, React, TypeScript, GraphQL, Tailwind CSS, Cloudflare Workers.
• iOS: SwiftUI, Xcode, Combine, SPM, MVVM.
• Android: Kotlin, Hilt, Coroutines, Jetpack Compose, MVVM.
• AI tools: Claude Code, OpenAI Codex, OpenCode, Cursor.

Benefits

• Online and in-person training, Coursera and Skillshare access, mentorship, and internal career opportunities.
• Extra vacation days, sick leave, special occasion leave, and parenting-related time off.
• Premium private health insurance in Lithuania and Poland.
• Calm, Headspace, and Mindletic subscriptions, plus resilience and mindfulness training.
• In-house gyms, Multisport and Urban Sport cards, online workouts, and physical well-being consultations.
• Company workations abroad.
• The ability to work from different locations.
• Gifts for birthdays, work anniversaries, weddings, and new family members.
• Summer camps for children and flexible working arrangements for parents.
• Team-building activities and company events.
• Access to Saily's Vilnius headquarters, including silent rooms, gyms, a game room, a music room, and a coffee bar.