Backend Engineer | Senior | Saily

Vilnius, Remote. Posted a month ago

The role

A Senior Backend Engineer will own product features end-to-end from idea to production. You will build features for personalization, A/B experimentation, and analytics using a Go codebase.

What you will do

Own product features end-to-end from idea to shipping and iterating
Build features supporting multi-dimensional personalization, A/B experimentation, and analytics
Make technical decisions with a product lens
Develop and maintain a high-quality, high-performance codebase in Go
Mentor colleagues and raise the bar on engineering best practices
Influence team vision and long-range goals
Run R&D spikes
Collaborate across engineering, product, and design in a cross-functional team

Required qualifications

5+ years of backend development experience
Strong skills in Python, PHP, Ruby, or similar
Readiness to work in Go daily
Product company experience
Solid system design skills
Experience with SQL (MySQL, PostgreSQL) and NoSQL (Redis, Cassandra)
Experience with Kafka or similar event-driven systems
Passion for building APIs that are easy to use and simple to understand
A collaborative mindset

Nice to have

B2C experience
Built your own product
Experience with K8s and microservice architecture
A track record of experiments shipped, hypotheses tested, and impact measured
Comfort working AI-native: Claude Code, Codex, Cursor

Benefits

Training, mentorship, and room to grow
Extra vacation days, sick days, and time off
Private health insurance in Lithuania and Poland
Free subscriptions to Calm, Headspace, and Mindletic
Resilience and mindfulness trainings
In-house gyms, sport cards, online workouts, and personal guidance
Company-wide trip abroad for workation
Gifts for birthdays, weddings, and new family members
Children's summer camps and flexibility around the schedule
Team building and company events
Access to Vilnius HQ with coffee bar, open gyms, kids' room, music room, and massage chairs

About the company

Saily provides lightning-fast, secure mobile data in 200+ destinations without roaming fees or plastic SIM cards. It is part of nord-security.