Senior Full-Stack Engineer, Multi-Tenant SaaS Platforms

A Senior Full-Stack Engineer will lead the architecture and development of a multi-tenant SaaS platform designed for regulated financial and government procurement workflows. This role involves owning end-to-end product surfaces, including configurable admin panels, tenant-aware data models, fee calculation engines, payment lifecycle tracking, and audit-ready financial exports. Ideal candidates will have experience as the lead or sole developer on a significant SaaS platform and will be comfortable making architecture decisions across the stack.

• Platform Architecture: Own architecture decisions across frontend, backend, data, and infrastructure for a multi-tenant SaaS product; balance configurability with maintainability.
• Tenant-Level Configurability: Build admin-managed configuration for fee models, reporting periods, grace periods, escalation rules, branding, and integrations without requiring code changes per tenant.
• RBAC & Multi-Portal Access: Design and maintain role-based access control across distinct user populations (internal ops, external vendors, government customers) with separate permission matrices per portal.
• Financial Engines: Build and maintain fee calculation engines supporting percentage, flat, capped, and tiered models with deterministic rounding; deliver audit-ready exports at penny-level precision.
• Payment Lifecycle & Reconciliation: Implement payment lifecycle tracking, cash reconciliation, and exception handling against external payment systems.
• Integrations: Integrate payment processors, procurement ERPs, CRM systems, and notification services into a cohesive platform; work with government payment gateways where applicable.
• Cross-Functional Collaboration: Partner with product, ops, and compliance stakeholders to translate regulatory and contractual requirements into shippable software.

• 5+ years of professional full-stack engineering experience, with 2+ years as a lead or sole developer owning architecture decisions on a production SaaS product.
• Multi-Tenant SaaS Experience: Has built multi-tenant SaaS with tenant-level configurability, allowing fee models, reporting periods, grace periods, escalation rules, branding, and integrations to be managed by admins without code changes.
• RBAC Across Distinct Populations: Has built role-based access control spanning internal operators, external vendors, and end customers, with separate permission matrices per portal.
• Financial Software: Has worked on financial or transactional features such as billing, fee calculation, payments, or reconciliation, with a focus on penny-level precision and audit trails.
• Integrations: Has integrated multiple third-party services into a single product.
• Communication & Ownership: Strong written and verbal communication skills; able to drive technical decisions independently and document tradeoffs clearly.

• Experience building platforms serving government procurement or regulated financial compliance.
• Familiarity with government payment gateways (Tyler / NIC or similar).
• BI embedding experience (PowerBI, Jaspersoft, or similar) with row-level data isolation across tenants.
• Experience exposing platform functionality to an agent layer through a typed SDK or API (no AI/ML expertise required; the portal interfaces with the agent layer, it does not build it).

This is a W-2 full-time employment position.

Hourly compensation ranges from $75 to $95.

Position available to candidates located in the United States.