Senior Full Stack Engineer Fintech & Treasury Orchestration  

Thesis OS is a specialized software engineering laboratory focused on building high-compliance "Operational Firewalls" for mission-critical industries. We are looking for a Senior Full-Stack Engineer to lead the development of our core financial engine and treasury orchestration layer.

The Mission: Your primary objective is the "Sprint to July"—architecting and hardening our Monoova-to-Xero treasury engine. You will be responsible for ensuring that the system enforces rigorous financial controls where logic is immutable and unauthorized access is systemically impossible.

Core Responsibilities:

Treasury Architecture: Build and maintain an instruction-based payout engine where capital remains the legal property of the principal until a formal, manual release is executed.

Compliance Enforcement: Implement "Hard Locks" on vendor profiles to prevent unauthorized bank account changes, treating any update as a net-new onboarding event requiring KYB re-verification.

Fraud Rules Engine: Architect automated monitoring for velocity rules, entity mismatches, and threshold breaches to trigger immediate transaction freezes.

One-Way Flow Logic: Enforce a strict unidirectional disbursement model that nullifies reversal risks and prevents systemic capabilities for money laundering.

Hybrid Stack Integration: Solve the "low-code ceiling" by injecting custom JavaScript into our WeWeb frontend to manage complex financial states and "Zero-latency" dashboards.

Secondary Integrations: Lead the technical implementation of OpenAI for automated document generation and Cloudinary for high-performance asset management.

Technical Guardrails:

You will ensure all payouts are strictly instruction-based and never arbitrarily automated by dates.

You will develop the "Interim Triage" layer for manual review of flagged transactions before escalation to the Risk Team.

You will ensure the backend possesses zero API endpoints for reverse-flow transactions, adhering to our off-platform dispute resolution policy.

• 7+ years of professional JavaScript experience with a deep understanding of asynchronous data flows.
• 5+ years of SQL experience (PostgreSQL preferred) with a focus on data integrity and relational schema design.
• 3+ years of experience with Xano or high-level backend orchestration tools.
• Expertise in API Integration: Proven track record of building two-way API architectures and webhook-driven systems (specifically with banking or payment rails like Monoova).
• Compliance Mindset: Previous experience working with banking-grade security, fraud prevention, or high-compliance environments (e.g., aligning with AS 8001:2021 standards).
• Communication: Highly proactive "Opinionated Developer" who can advocate for technical security over UI convenience.