Staff / Senior Software Engineer

Mandrel•New York, NY

About The Position

About Mandrel Mandrel is building the AI-native ERP for physical goods. Today, our wedge is simple and painful: true, auditable gross margin by SKU and channel, tied to real supply-chain source of truth documents. Founded in 2023, Mandrel has raised over $12M top-tier investors like Lux Capital, Construct Capital, Zigg Capital, Asymmetric Capital Partners, WndrCo, and Clocktower Ventures. The team is headquartered in New York and brings deep expertise in finance and AI. About this role We’re hiring a highly motivated Staff / Senior Software Engineer to join our team in New York. and collaborate across engineering, product, and customer teams to scale our core platform. You will own critical architecture decisions, drive technical standards, and ship high-impact systems end-to-end—from initial concept and prototypes to reliable, production-ready features. This is a deeply autonomous role where you will shape both the product and the underlying engineering foundation.

Requirements

5+ years of full-stack industry experience building complex, data-intensive applications
Proficient in our core stack: TypeScript, NestJS, GraphQL, Next.js, PostgreSQL, and Redis
Experience architecting systems from scratch — ideally in finance, accounting, supply chain, or other B2B domains
Experience building real-time systems (WebSockets, subscriptions, event-driven architectures)
Experience with AI/ML integrations (agentic workflows, document processing, content extraction)
Understand multi-tenant architecture patterns and enterprise security requirements
Experience with cloud platforms (AWS) and containerization (Docker)
Comfortable working with complex domains and translating requirements into technical solutions
Self-driven, product-oriented, and motivated by building software that material improves business operations.

Nice To Haves

experience with inventory management, document processing, financial, or general ledger systems

Responsibilities

Design, develop, test and deploy systems that automate key finance workflows and transform data into real-time financial insights for our brands.
Define and contribute to the technical roadmap, working with customers and the internal team translate requirements into scalable architectures and identify opportunities for improvement
Develop and refine AI-powered data pipelines for extracting, classifying, and linking unstructured data from a variety of operations and finance data sources, including supply chain documentation
Architect and implement real-time data synchronization systems using GraphQL subscriptions, WebSockets, and PubSub to keep data instantly updated across all users
Design multi-tenant enterprise features for procurement, inventory, and accounting automation with organization-level data isolation
Build sophisticated integration layers connecting ecommerce platforms (Shopify, Amazon), warehouse platforms, financial software (Bill, QuickBooks), logistics providers, and email inboxes
Optimize background processing systems for document analysis, data aggregation, and automated financial reconciliation workflows
Influence engineering standards and mentor teammates, helping establish best practices for system design, code quality, testing, and operations