Backend Engineer

About Us:

We're on a mission to make subscriber churn a solved problem. Backed by a16z Speedrun, we build AI agents that help consumer subscription brands - like Higgsfield and Promova - retain more users, extend lifetime value, and grow fast. We're an incredibly driven team working on a problem that affects every consumer on the planet. If that sounds like your kind of thing, we'd love to meet you.

Our co-founders are Azamat Khamidov and Benazir Toleubekova. Azamat built a Telegram AI product from zero to five million users in four months, the first acquisition inside Telegram. Benazir received a full scholarship to Beijing University of Technology at 15. Joined Taobao at 17. At Alibaba, architected the core recommendation engine serving 500M daily users.

What You'll Do:

As a Backend Engineer, you will play a central role in building and maintaining the critical backend infrastructure that powers our products. In this position, you will:

• Contribute to designing scalable architectures that support new product features and business requirements.
• Drive the development, deployment, and optimization of backend services, ensuring performance, reliability, and maintainability.
• Collaborate with cross-functional teams to integrate third-party platforms, APIs, and emerging AI technologies.
• Lead technical discussions, offering best practices, mentorship, and guidance to team members.
• Take an active part in the continuous improvement of our engineering standards and development processes.
• Proactively identify and resolve complex technical challenges to ensure stable, secure operations.

What You'll Bring:

• +1 years of professional experience in backend development, with a track record of delivering reliable and scalable systems.
• Advanced proficiency in server-side programming and experience designing database-driven applications.
• Strong grasp of API development, systems integration, and best practices in software engineering.
• Experience building and maintaining environments that scale to serve real users in production.
• An independent and proactive approach to problem-solving, with the ability to drive projects forward.
• Based in San Francisco or able to be here full-time. We're not offering visa sponsorship at this time.

Our Values:

Stewardship : We build for the long term. Every customer, partner, and teammate gets that same commitment from day one.

Trust : Earned through the integrity of our technology, the consistency of our commitments, and the honesty of our communication.

Customer Obsession: We win when our customers win. Every choice and conversation orbits around what makes them stronger.

Excellence: The same standard for the product we ship, the service we give, and the team we build. The bar is the bar.

Family: A constellation, not a single star. We back each other on hard days, celebrate the great ones, and protect the time teammates need to be parents, partners, and humans first.

Life at Sirius:

In-person, in San Francisco: We work side by side, on-site in San Francisco. Proximity helps us move faster, solve harder problems, and build something we're proud of together. Note: we're not able to offer visa sponsorship at this time.

Flexible healthcare: We offer flexible spending to direct your benefits toward what matters most to you and your family.

Own what you build: We're building something real, and we want you to own it.

Lunch, coffee & snacks: Daily lunch, plus coffee, tea, and snacks to keep you going.

Time off that's actually off: Take the time you need to show up as your best self. We mean it.

Company Events: Take the time you need to show up as your best self. We mean it.