Software Engineer (AI)

About the role

Numeral is redefining the complex relationship between digital businesses and tax compliance. Operating across 47 states and more than 70 countries, companies face a complicated regulatory environment that hinders growth. Numeral exists to remove this obstacle, allowing teams to dedicate their energy to primary business objectives. We are the largest and fastest-expanding AI-native solution in this space, having raised over $57M from leading investors since our founding in 2023. Our customer base exceeds 3,000 paying entities, and our revenue has increased threefold annually. We are seeking a Foundational AI Engineer to join our team. This is a hands-on position for a builder who wants to construct the core technical architecture of an AI-first startup. You will be responsible for designing and deploying end-to-end intelligent systems, focusing on model orchestration, automated workflows, and agentic functionality. Your work will directly define the technical standards and infrastructure of our early-stage operation. Your daily responsibilities will involve designing, building, and managing production AI systems, including tool-calling agents and Retrieval-Augmented Generation implementations.

Key facts

What you'll do

• Architect and deploy production-grade AI systems that handle complex tool-calling agent workflows and Retrieval-Augmented Generation pipelines.
• Design and implement scalable backend services and APIs using PostgreSQL and Redis to support real-time inference and internal tooling.
• Build and maintain integrations with third-party model providers and MCP servers using modern frameworks to ensure extensibility and reliability.
• Establish and enforce technical standards for workflow automation, creating robust observability and performance metrics for all services.
• Optimize system design for critical factors including latency, cost-efficiency, reliability, and the speed of product iteration.
• Collaborate closely with product, design, and data teams to translate business requirements into technical solutions that solve real customer problems.
• Develop and maintain frontend user interfaces using TypeScript and its associated ecosystem to ensure seamless user experiences.
• Shape engineering best practices, AI safety protocols, and the broader technical culture of the company through mentorship and code leadership.
• Partner with cross-functional teams to deliver high-impact features in a fast-paced environment where priorities shift frequently.
• Contribute to the entire product lifecycle, from initial concept and architecture to deployment and ongoing optimization.

Requirements

• Bring 7+ years of experience building products in high-growth environments to demonstrate resilience and adaptability.
• Possess 2+ years of experience with Large Language Models in production settings to ensure practical implementation knowledge.
• Prove you are an avid user of advanced AI development tools to stay current with industry capabilities.
• Show fluency in backend technologies such as PostgreSQL and Redis, as well as cloud service platforms.
• Demonstrate frontend development experience, particularly with TypeScript and its associated ecosystem.
• Maintain a strong product sense that balances flexibility, performance, and delivery speed.
• Operate comfortably in dynamic, fast-paced settings where priorities change frequently without losing focus.
• Communicate clearly and collaborate effectively across diverse teams to achieve shared objectives.
• Embrace ambiguity and exhibit ownership driven by rapid growth and a commitment to company success.

Nice to have

• Specific experience in payments, tax, accounting, or regulatory technology is highly relevant to the domain.
• Backgrounds in automation tools, such as workflow engines or internal platform development, provide valuable context.
• Knowledge of model orchestration frameworks and the practical use of vector databases is also a key asset for advanced implementation.

Practical notes

• Location for this role is New York with a hybrid work model.
• The engagement is full-time, with a base compensation of $180,000 plus equity.
• You will receive comprehensive medical, dental, and vision coverage, along with wellness benefits including access to Headspace and the Peloton One App.
• Additional perks include a 401(k) plan, lunch and snacks, regular team offsites, and a culture built on ownership and impact.
• Numeral is transforming how taxes get done. Digital businesses are currently bogged down by a painful web of regulations across 47 states and 50+ countries. We're eliminating this burden so teams can focus on their core mission.