Job Title: Senior Software Engineer (NYC)
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.
You will:
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
You're a good fit if you:
Have 5+ years of full-stack industry experience building complex, data-intensive applications
Are proficient in our core stack: TypeScript, NestJS, GraphQL, Next.js, PostgreSQL, and Redis
Have experience architecting systems from scratch -- ideally in finance, accounting, supply chain, or other B2B domains
Have built real-time systems (WebSockets, subscriptions, event-driven architectures)
Have worked with AI/ML integrations (agentic workflows, document processing, content extraction)
Understand multi-tenant architecture patterns and enterprise security requirements
Have experience with cloud platforms (AWS, Heroku) and containerization (Docker)
Are comfortable working with complex domains and translating requirements into technical solutions
Are self-driven, product-oriented, and motivated by building software that material improves business operations.
Bonus: experience with inventory management, document processing, financial, or general ledger systems
Benefits & perks
Competitive salary & equity package
Unlimited vacation (with 15 days encouraged)
Comprehensive medical, dental, and vision insurance
Relocation assistance to NYC
Why work with us
At Mandrel, we believe in fostering a culture where hard work is rewarded and personal growth is prioritized. Working with us means you’ll have:
Play a key role as an early team member at a growing startup with a high level of ownership
Work directly with the founding team and customers
Be a part of a fast-paced team that works together in person in NY
Opportunities for mentorship and professional development
Solve real problems that impact the bottom line of your favorite consumer brands
Skills Required
- 5+ years of full-stack industry experience building complex, data-intensive applications
- Proficiency with TypeScript, NestJS, GraphQL, Next.js, PostgreSQL, and Redis
- Experience architecting systems from scratch, ideally in finance, accounting, supply chain, or B2B domains
- Experience building real-time systems using WebSockets, subscriptions, or event-driven architectures
- Experience with AI/ML integrations, agentic workflows, document processing, or content extraction
- Understanding of multi-tenant architecture patterns and enterprise security requirements
- Experience with cloud platforms such as AWS or Heroku and containerization with Docker
- Ability to translate complex business requirements into technical solutions
- Experience with inventory management, document processing, financial systems, or general ledger systems
What We Do
Mandrel is the modern finance & accounting partner for consumer brands. We pair experienced accountants with AI-powered software automation to deliver real-time, product-level financial clarity for brands with unmatched accuracy and effortless, audit-ready financials at every stage of growth.
Why Work With Us
At Mandrel, we believe in fostering a culture where hard work is rewarded and personal growth is prioritized. Join us in building solutions that provide seamless financial insights to consumer brands so they can make smarter decisions to grow faster more profitably.
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