Senior Software Engineer (Backend) - Sybill

About the Company:

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?

• 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 a talented backend engineer to build and scale core systems powering our AI-first sales platform. As a key individual contributor, you'll develop critical components of our seller co-pilot system, working at the intersection of backend services and AI infrastructure. This is an exciting opportunity to own end-to-end development of systems that are transforming how B2B sales teams operate.

What You'll Be Doing:

• Build scalable, easy-to-maintain backend services that power our AI co-pilot features using Python/Go
• Implement elegant event-driven systems using AWS services for real-time AI processing
• Create robust data pipelines and APIs that handle complex sales workflow automation
• Design and implement efficient database schemas and data flows across MongoDB, PostgreSQL, and Redis
• Build monitoring and observability solutions for production systems
• Contribute to technical design discussions and architectural decisions
• Work closely with product and AI teams to ship impactful features and scale AI capabilities
• Use modern developer tools like Cursor and CoPilot to maximize engineering productivity

Who You Are:

• Strong expertise in building production-grade backend systems with Python and/or Go
• Solid experience with distributed systems and event-driven architectures
• Proven track record with AWS services and cloud-native development
• Strong foundation in database technologies (MongoDB, PostgreSQL, Redis)
• Comfortable with ambiguity and capable of writing clean, maintainable code that solves real user problems
• Bias for action and ability to move fast while maintaining high-quality standards
• A strong communicator who can collaborate effectively across teams

Qualifications:

• 5+ years of software engineering experience, with 2+ years as a senior backend engineer
• Strong background in API design and implementation
• Deep expertise with AWS services and cloud-native development
• Experience building and scaling distributed backend systems
• Experience with modern database technologies and data pipelines
• Exposure to CRM (Salesforce, etc.) systems or similar B2B products is highly preferred
• Experience with AI/ML systems integration is also preferred
• Bachelor's degree in Computer Science or related field
• 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: $160,000 - $200,000 + full health/vision/dental insurance + equity in a rapidly growing startup
• True builder's paradise: Own and ship entire features that directly impact thousands of sellers
• Code that matters: Every line you write helps automate painful sales workflows and drives customer wins
• High-velocity engineering: Push code to production daily and see immediate impact
• Modern tech stack: Work with latest AWS services, event-driven architectures, and AI integrations
• Developer-first culture: Use cutting-edge tools like Cursor/CoPilot to maximize your productivity
• Zero bureaucracy: Direct access to users, quick decisions, and rapid shipping cycles

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.