Staff Software Engineer (Backend)

About Sybill:

At Sybill.ai, we're building the next evolution in B2B sales – an AI-first platform that transforms how sellers work. Think of it as your intelligent sales IDE (Integrated Deal Environment), empowering sellers to focus on what truly matters: building relationships and closing deals.

Today, sellers spend 70% of their time on non-revenue activities. We're flipping this paradigm on its head. Sybill's AI lets sellers become super-performers who guide AI systems and focus on high-impact customer interactions.

Our proprietary AI technology, developed by a small but mighty team from Stanford, Harvard, and the IITs, and backed by leading investors in Silicon Valley, is not just another tool; it serves as the foundation of a groundbreaking sales workflow that delivers exceptional outcomes for our users. With 99%+ retention and 20x growth to $1.2M ARR last year, our customers' enthusiasm speaks for itself.

Who Thrives at Sybill?

We're looking for ambitious individuals who:

• Are excited to create a new way of working for today’s top sellers

• Can run with projects independently - you won't have someone looking over your shoulder

• Aren’t afraid to try new approaches; are candid about wins and own mistakes, and learn from both

• Get excited about big goals, but also know how to break them down and execute

• Understand that some weeks are intense - we're building something ambitious and that takes real work

Our commitment to you: We believe Sybill should be your biggest career accelerant yet. We'll deliver on this by tackling hard problems together, giving you real ownership, and pushing you to grow beyond your comfort zone. If you're ready to match this ambition with your own drive, we should talk.

The Opportunity:

We're seeking an exceptional backend engineer to architect and build the core systems powering our AI-first sales platform. As a key technical leader, you'll shape the foundation of our seller co-pilot system, working at the intersection of large-scale backend architecture and AI infrastructure. This is a rare opportunity to own mission-critical systems that are transforming how B2B sales teams operate.

What You'll Be Doing:

• Design and implement scalable, production-grade backend services that power our AI co-pilot features using Python/Go

• Architect simple and elegant event-driven systems leveraging AWS services to handle real-time AI processing and sales workflow automation

• Build robust data pipelines and APIs that handle real-time AI processing and sales workflow automation

• Drive technical strategy for major initiatives that unlock new AI capabilities for our users

• Design and implement core infrastructure components that other engineers will build upon

• Set technical standards and best practices for backend development

• Mentor other engineers and contribute to building a strong engineering culture

• Use modern developer tools like Cursor and CoPilot to maximize engineering productivity

Who You Are:

• Deep expertise in building production-grade backend systems with Python/Go, with strong experience in designing distributed event-driven systems

• Adept at product-first thinking and rapidly translating product capability requirements into robust backend systems

• Extensive hands-on experience with AWS services, cloud-native development, and service-oriented architecture

• Demonstrated history of delivering high-impact engineering solutions that drive significant business results within tight deadlines

• Comfortable with ambiguity and capable of defining technical paths for projects with well-defined outcomes

• Bias for action and ability to move fast while maintaining high-quality standards

• A strong communicator able to collaborate effectively with both technical and non-technical stakeholders

Qualifications:

• 8+ years of professional software engineering experience, with at least 3 years in senior/staff roles architecting backend systems

• Expert-level proficiency in Python/Go, with prior experience building production-grade distributed systems leveraging generative AI

• Strong track record designing and optimizing systems using MongoDB, PostgreSQL, and Redis at scale

• Advanced degree (MS/PhD) in Computer Science or related fields strongly preferred

• Proven track record of delivering multiple complex backend systems or features as an individual contributor.

• Proven ability to architect elegantly simple yet highly scalable systems, anticipating evolving requirements in dynamic environments

• Experience with cloud platforms (AWS preferred) and containerization technologies, with a focus on rapid deployment and scaling

• Exposure to or experience with B2B products is highly preferred.

• A proven track record of thriving in early-stage startup environments, showing resilience and flexibility in the face of uncertainty.

What We Offer:

• Competitive compensation: $200,000 - $240,000 + full health/vision/dental insurance + equity in a rapidly growing startup

• True ownership: Ship game-changing features that directly impact our 20x growth trajectory

• Real impact: Build and deploy core systems that transform how thousands of sellers work

• No red tape: Direct access to customers, quick decision-making, and rapid shipping cycles

• Results over process: We measure impact through customer wins, not meetings attended

If you're energized by executing ambitious technical projects and seeing your code transform how sales teams operate, join us in building the future of B2B sales.