Backend Engineer · Mid - Senior · Go · 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. Saily has millions of paying customers and hundreds of thousands travelers browsing through Saily at any given moment.

To build the best product for our customers we foster AI-native Product Engineering culture, where:

• The Engineer is the builder, who is responsible for solving customer problems end-to-end (idea to production)
• AI Agents are the enablers who write most of the code and solve repeatable tasks to help the Engineers maximize their impact
• Everyone contributes to making Saily effective by suggesting new areas for improvement to delegate to agents and then implementing the changes
• Curiosity, learning and sharing are everyone's responsibility
• Customer, having a comfortable, connected, hassle-free journey is never lost from the focus

We value growth over comfort, contribution over hierarchy, and impact over process. At Saily, we believe in giving sharp people context, autonomy, and AI as their multiplier to allow them to just do their best work.

Main Responsibilities

• Enhancing the Saily product by developing and maintaining new features.
• Create features to support layers of multi-dimensional personalization, A/B experimentation, and analytics.
• Develop and maintain a high-quality codebase.
• Seek to improve code and performance constantly.
• Mentor colleagues on development best practices & provide technical guidance.
• Exercise influence on the overall vision and long-range goals of your team.
• Perform R&D operations whenever required.
• Work as part of a cross-functional team and help to ensure smooth communication between all team members.
• Collaborate with engineering, product, and design professionals from other teams.
• Please keep in mind that this position requires office attendance 3 times a week!

• 4+ years of product experience, preferably in a startup/scaleup environment
• Proven experience working with Go
• System design is nothing new to you, and you know what patterns to use, when, and why
• Previous experience in working with K8s and microservice architecture is a plus
• Previous experience with SQL (MySQL, PostgreSQL) and NoSQL (Cassandra, Redis) solutions
• Previous experience with Kafka
• Passionate about building APIs that are easy to use and simple to understand
• Strong product mindset: focus on problems, outcomes, and impact—not just tickets or tasks
• You are curious about AI and excited to work with agents

• Sharpen your edge: Extensive online and in-person training programs, access to platforms like Coursera and Skillshare, a mentorship program, and internal career moves when you’re ready for something new — your development has no ceiling here.
• Take the time you need: Enjoy extra vacation days that grow with your time here, plus additional days off for sick leave, special occasions, and parenting.
• Get premium healthcare: We provide premium private health insurance so you have peace of mind and fast access to care whenever you need it. Available in Lithuania and Poland.
• Protect your peace: We provide free subscriptions to top-rated Calm, Headspace, and Mindletic apps, offer resilience and mindfulness trainings, and run dedicated mental health events.
• Own your fitness: We offer in-house gyms, Multisport and Urban Sport cards, and online workouts. Need something tailored? Our Physical Well-Being experts are here with group mobility sessions, fitness guidance, and one-on-one consultations.
• Pack your bags for workation: The entire company flies out abroad for workshops, activities, concerts, and real time together.
• Work from anywhere: When you need a reset, switch location and work from wherever keeps you sharp, creative, and in the zone.
• Celebrate your milestones: Birthdays, work anniversaries, weddings, new family members — each is marked with a special gift.
• Parent with ease: We organize summer camps for the little ones and offer flexibility that lets you show up both for your family and your team.
• Join the party: Team buildings, year-round company events, and iconic summer and winter celebrations.
• Unlock Cyber City: Our Vilnius HQ is fully yours to enjoy with silent room, open gyms, game room, music room, coffee bar.