Full Stack Engineer

Senior Backend / Full-Stack Software Engineer (In-Office — Mechanicsburg, PA) Role Summary You’ll lead major backend domains and raise the bar on architecture, reliability, and delivery—while still shipping hands-on and collaborating others. What You’ll Do Lead backend architecture and implementation using NestJS / Node.js / TypeScript Own key domains such as: downline/hierarchy engines, attribution logic, referral tracking commission calculations with auditability and correctness enrollment workflow orchestration, validation, and edge-case handling database performance, data integrity, and scaling practices Design robust Postgres schemas and optimize query performance (indexes, migrations, tuning) Improve engineering standards: testing strategy, code reviews, documentation, release practices Diagnose production issues, run root-cause analysis, and implement preventative fixes Translate evolving business requirements into stable technical designs Qualifications 6+ years of professional engineering experience (or equivalent) Deep backend expertise in Node.js / TypeScript (NestJS strongly preferred) Advanced PostgreSQL and data modeling experience Strong system design instincts (security, correctness, performance, maintainability) Comfortable with frontend fundamentals (React/NextJS) to ensure smooth integration Must be able to work in-office Nice to Have Experience with complex tree/graph data structures and financial-style calculations Background jobs/queues, eventing patterns, workflow engines Observability practices (logging/metrics/tracing) and production hardening