Member of Technical Staff - Backend Engineer

Job description

What you'll do Build scalable, production-grade full-stack systems that serve millions of users with high reliability and performance Develop robust backend API services (Python) that power core product functionality and data workflows Design and implement intuitive, high-quality frontend experiences — with strong attention to design, usability, and customer experience Architect and manage deployments on GCP and Kubernetes, ensuring reliability, observability, and scalability Design and maintain storage backends (databases, object storage, caching layers) to support high-throughput, data-intensive systems Own features end-to-end — from product conception and system architecture to deployment, monitoring, and iteration Collaborate closely with customers and internal teams to ship quickly, incorporate feedback, and continuously improve the product Qualifications Strong experience building and shipping full-stack web applications, with the ability to move fluidly between frontend and backend Proficiency in modern frontend technologies (TypeScript, React, modern CSS, Vercel) and backend development (Python or similar), with experience operating production systems Hands-on experience deploying and operating systems on GCP and Kubernetes, with strong infrastructure fundamentals Experience designing and managing storage systems (SQL/NoSQL databases, object storage, caching layers) Interest in AI systems and enthusiasm for building tools that help engineers work more effectively with AI agents High bar for product quality, performance, and user experience — balanced with the ability to move quickly and iterate Generalist mindset with comfort working across infrastructure, APIs, data models, UI layers, and deployment environments Strong ownership mentality and ability to thrive in a fast-paced startup environment Bachelor’s degree in Computer Science, Engineering, or related field (or equivalent practical experience) Our Core Values Customer Obsession - We start with the customer and work backwards. We aim to earn trust through consistent delivery, thoughtful listening, and by obsessing over customers. Intellectual Honesty - We operate with high trust and low ego. Ideas matter more than titles, and we communicate openly and directly while assuming good intent, even in strong disagreement. Bias for Action - We set high standards and move quickly to meet them. We prefer building and learning with customers over debating in the abstract, and we iterate based on real feedback. Extreme Ownership - We take responsibility for outcomes, not just tasks. Ownership means seeing problems through to completion and ensuring solutions truly work in practice. Benefits and perks Competitive salary plus meaningful equity package Comprehensive medical benefits and generous PTO Flexible work arrangements Direct impact on company direction and technical decisions High ownership and the opportunity to make a career-defining impact As a founding member, you’ll help define the technical foundation of NeoSigma. Your scope will grow with the company, from owning core systems end-to-end to shaping architecture, hiring, and engineering culture. This role has a natural path toward technical leadership or engineering management as the team scales. About Us NeoSigma is a product-driven research lab building the intelligence layer that helps close the feedback loop between your customers, products, and AI systems. We are a small, intensely technical team of researchers and engineers who have trained frontier-scale models and widely used AI products and agents at MIT, Parallel Web, Essential AI, Apple, and Amazon.