Senior Backend Engineer

Overview:Senior Backend EngineerLocation: On-site in New York City, New York (relocation required if not local)Work Setup: Office-first environment - in-person most days during the weekVisa Sponsorship: Not availableRole SummaryWe are hiring multiple Senior Backend Engineers to design and build high-throughput, low-latency backend systems for a new privacy-focused product line serving demanding enterprise and institutional customers. You will work on greenfield architecture, take systems from 0→1, and own critical infrastructure that must be highly reliable, secure, and performant.What You'll DoDesign, build, and scale high-performance, fault-tolerant backend services that handle significant request and data volumes.Own large-scale, multi-tenant distributed systems with a strong focus on correctness, reliability, and clear SLOs.Collaborate closely with mobile and frontend teams to define and maintain robust API and SDK boundaries.Build durable, highly available data and caching layers using technologies such as PostgreSQL, Redis, and NATS (or similar tools).Lead development of core enterprise capabilities, including SSO, SCIM provisioning, and secure data import/export flows.Partner with security and infrastructure engineers to harden production systems and align them with a stringent threat model. Qualifications3+ years of experience building and operating high-throughput, distributed backend systems in production.Strong systems engineering background with a proven track record of owning critical services end-to-end (design through operations).Proficiency in at least one of the following systems languages: Rust, Go, or C/C++, with willingness to work primarily in a systems language.Experience taking systems from concept to production (0→1) in fast-paced environments (early-stage startup or high-growth teams).Deep focus on reliability, observability, performance, and long-term maintainability. Nice to HaveExperience with privacy-tech, secure messaging, or cryptographic / end-to-end encrypted systems.Background working on products with strict security, compliance, or regulatory requirements (e.g., government, fintech, or critical infrastructure).Prior experience in early-stage companies (Seed - Series B) helping set technical direction. Team & CultureYou'll join a small, senior engineering team where every engineer has significant product and architectural ownership. The culture values integrity, deep curiosity about technology, and long-term craftsmanship over short-term optimization. We are motivated by building privacy-preserving systems that meaningfully raise the bar for security and reliability.CompensationCompetitive cash compensation at the upper end of the market for senior backend engineers in this geography.Meaningful equity in a high-growth, early-stage company.Why This Is a Great OpportunityWe have just raised one of the largest Seed rounds in tech, backed by major VCs. This is a rare opportunity to join an early-stage company at the ground floor and play a foundational role in building mission-critical, privacy-first infrastructure for enterprise and institutional customers.Skills: