Backend Engineer | Senior | Golang | Saily at Nord Security

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! Core Requirements • Over 4 years of experience in backend development. • Preferably with a background in Python, PHP, or Ruby languages. • 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. • A collaborative mindset where you love to discuss, rethink, and redesign your ideas that create shared success within your team and the company. Tools You Will Use • Backend: Go, MySQL, Kafka, Docker, Kubernetes, AWS, Redis • Frontend: Next.js, React.js, TypeScript, GraphQL, Tailwind CSS, Cloudflare Workers • IOS: SwiftUI, Xcode, Combine, SPM, MVVM Architecture • Android: Kotlin, Android Studio, Hilt, Coroutines, Jetpack Compose, MVVM Architecture • AI tools: Claude Code, OpenAI Codex, OpenCode, Cursor with Composer Salary Range • Gross Salary 19800-33400 PLN/month. What We Offer   Innovate with industry leaders Work alongside global experts to build world-leading cybersecurity tools, impacting millions of users around the world.   Learn & grow Boost your skills via our extensive training programs (online and offline) & other resources. Benefit from mentorship and career-switch opportunities to grow within the company.    Hybrid work Enjoy the flexibility with 3 office days and working from home for the remaining 2.   Work from anywhere Recharge with a change of scenery – choose work from any location when you feel a need to power your creativity and drive.    Physical well-being Fuel your active lifestyle with online workouts led by our Physical Well-Being experts. Unlock a variety of sports and wellness facilities, like gyms, swimming pools, and fitness classes, with the Multisport card.     Mental & emotional health Nurture your mind with free psychologist consultations, dedicated mental health events, and premium access to top-rated wellness apps like Calm, Headspace, and Mindletic.   Premium healthcare Receive private health insurance giving you peace of mind for your health needs.   Joyful moments – special treats Celebrate life’s big moments with special gifts from us on your birthday, anniversary, and other major events, such as weddings or the arrival of a new family member.    Company events & team-building Experience iconic Nord Security celebrations, team-buildings, and knowledge-sharing events, nurturing bonds that fuel our success.   Workation Embark on a legendary company getaway abroad, filled with exciting activities, live concerts, engaging workshops, and epic time together.   Kindly refer to our Privacy Notice for Recruitment Candidates for comprehensive information regarding our data handling procedures throughout recruitment processes: [Upgrade to PRO to see link]   We expect all candidates to provide accurate and complete information during the recruitment process. While limited use of AI tools to refine application materials is acceptable, candidates remain fully responsible for ensuring that their submissions reflect their own qualifications, skills, and experience. Any failure to do so may negatively affect participation in the recruitment process. If broader AI assistance is allowed for a particular role or stage, we’ll let you know in advance.   By submitting your application, you acknowledge that it may be processed using automated tools for evaluation purposes. As part of our recruitment process, we may use an AI-based application review tool to help assess applications based on skills and experience relevant to the role. This technology is used to support - not replace - human decision-making, and every application is ultimately reviewed by a recruiter. If you would like more information about how AI is used in this process or wish to exercise your rights under applicable data privacy laws, please contact us at [Upgrade to PRO to see contact]. Should you prefer to opt out of the automated evaluation, please submit your application directly to [Upgrade to PRO to see contact].