Senior Software Engineer, Backend

Field sales powers the economy — but most teams are struggling. Reps are buried in admin work, managers are stretched thin, and leaders can’t see what’s really happening in the field. Siro is redefining how field sales teams learn, perform, and win. We started as an AI-powered coaching platform that helped reps improve their outcomes in the field. Today, we’re something much bigger — an intelligent companion that automates sales reps’ tedious admin work, gives managers real-time visibility, and helps executives see around corners. Our platform integrates with systems like Salesforce, analyzing thousands of in-person sales conversations to surface insights, automate workflows, and drive better outcomes across the org. Think Iron Man’s Jarvis for sales — proactive, personalized, and built directly into the tools teams already use. Siro has raised $75M and is backed by world-class investors like Index, Fika, CRV, and SignalFire. We are trusted by leading home-improvement, retail, hospitality, and automotive brands, and powered by a lean team from Meta, McKinsey, Doordash, and Uber. We’re building the future of human-AI collaboration in sales — and we’re just getting started. KEY RESPONSIBILITIES - Build platform and backend systems at Siro, across recording, integrations, AI agents, and more! - Own the end-to-end development of key features, from architectural decisions through implementation, deployment, and support - Design and build scalable backend services that handle real-time processing of sales conversations - Drive technical excellence through thoughtful code reviews, documentation, and engineering best practices - Partner closely with product and design teams to transform customer needs into elegant technical solutions - Own the health of our systems and products, and make data-driven decisions - Help evolve our development practices and tooling to enable sustainable scaling while maintaining velocity REQUIREMENTS - We expect 6+ years of professional software engineering experience. - You are excited to work in our NYC office 3+ days a week with the rest of the team. - You have strong proficiency in modern programming languages, databases, API frameworks, and cloud platforms (like GCP) - You are a strong problem solver, with the ability to think critically and approach challenges with a first-principles mindset. - You have strong communication skills, able to articulate complex technical concepts to both technical and non-technical stakeholders. OUR TECH STACK In case you’re curious, we use the following technologies (and more), but proficiency in any specific technology is not required. - Frontend: Next.js, React Native, TypeScript - Mobile: Swift, Kotlin - Backend: Node.js, Typescript, serverless functions - Cloud: Google Cloud Platform (GCP) - Other tools: Git, Datadog, Figma WHY JOIN SIRO? - Growth: Join a rapidly scaling Series B startup with proven product-market fit - Technology: Work with cutting-edge AI technologies and a modern tech stack - Team: Collaborate with an experienced CEO (previously built a successful sales tool used by 100,000+ reps) and top-tier team - Ownership: Take end-to-end ownership of features that directly impact our users - Learning: Work across the full stack and grow your technical breadth - Impact: Help democratize sales success and create opportunities for millions of sales professionals WHAT SETS YOU APART - You're a collaborative team player with a "we before me" mindset, always ready to support and elevate your colleagues. - You have high standards for excellence and aren't afraid to voice your opinion to push for quality. - You think strategically beyond code, considering business and design implications in your work. - You actively leverage AI coding tools to assist you during development. - You thrive in an agile environment with low management overhead. - You're creative and can think outside the box to solve complex problems in innovative ways. - You continuously look to grow