Twenty

Staff/Principal Backend Software Engineer

Twenty
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16 hours ago
Arlington, VA, USAStaff+

Base Salary

$192k - $455k/yr

Responsibilities

  • Architect and build high-throughput backend services that process real-time operational data.
  • Lead technical design reviews and make architecture decisions for new features and system improvements.
  • Design resilient, observable, performance-tuned event-driven and distributed systems.
  • Define stable APIs for internal and external consumers and partner with frontend teams on integration.
  • Improve engineering practices through code reviews, standards, testing strategy, and incident practices.
  • Build and maintain CI/CD workflows for rapid and secure delivery.
  • Troubleshoot production issues, lead incident response, and drive durable fixes.
  • Translate product and operational needs into technical plans and contribute to backend strategy and roadmap planning.
  • Mentor engineers and support hiring through interviews and defining engineering standards.

Requirements

  • 10+ years building scalable backend systems in production environments.
  • 4+ years of Go experience, or 4+ years writing server-side business logic in Java, Kotlin, C#, Python, C, C++, or Rust with strong system-design aptitude.
  • Experience leading technical initiatives end to end, including architecture, execution, and delivery.
  • Experience designing distributed systems, including event-driven architectures, messaging, and consistency tradeoffs.
  • Experience building and operating cloud-native services in production; AWS is preferred.
  • Strong security fundamentals including secure coding, threat modeling, and defensible design.
  • Track record of mentoring engineers through code reviews, technical guidance, and feedback.
  • Strong communication skills and ability to align teams around technical decisions.
  • Preferred experience with graph databases such as Neo4j or AWS Neptune, relational databases such as Postgres, MySQL, or MariaDB, defense or security-focused products, large-scale data processing, and production ML/AI integrations.
  • U.S. citizenship is required; some positions may require eligibility to obtain and maintain a U.S. Government security clearance.

Benefits

  • Medical, dental, vision, life/AD&D, and disability plan options.
  • Paid parental leave for eligible full-time employees, including 12 weeks for birthing parents, 4 weeks for non-birthing parents, and 6 weeks for adoptive, foster, or intended parents through surrogacy.
  • Paid holidays and flexible PTO.
  • 401(k) with pre-tax and Roth options, HSA/FSA options, and dependent care FSA.
  • Full-time, on-site role; benefits vary by location, role, and eligibility.

Tech Stack

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51-200 employees
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