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Toptal

Principal Back-End Engineer

Toptal
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about 4 hours ago
Berkeley, CA, USA +2 more
Staff+
H1B Sponsor

Responsibilities

  • Build, maintain, and own Rails API capabilities across multiple business domain packs.
  • Design and implement background job workflows with Sidekiq for async and parallel processing.
  • Integrate and optimize LLM-based features for resume analysis, writing, and generation.
  • Build and maintain event-driven systems using pub/sub patterns for cross-domain communication.
  • Design PostgreSQL schemas and data models with strong attention to data integrity.
  • Integrate third-party services, including payment processors and cloud services.
  • Maintain and evolve a modular monolith architecture with explicit package and domain boundaries.
  • Collaborate closely with front-end and infrastructure teams on API contracts and deployment workflows.
  • Use AI development tools daily to increase delivery speed and improve code quality.
  • Work independently, communicate progress clearly, and take accountability for delivery.

Requirements

  • 8+ years of professional Ruby on Rails development experience.
  • Strong PostgreSQL skills, including schema design and query optimization.
  • Experience with async/background processing systems such as Sidekiq.
  • Proficiency in Redis, especially for caching and session management.
  • Strong REST API design and implementation experience at production scale.
  • Experience integrating external APIs such as payment processors and cloud storage.
  • Comfortable working in modular monoliths with clear domain boundaries.
  • Ability to reason about scalability, performance, and data integrity.
  • Strong technical ownership and accountability for implementation decisions.
  • Fast, independent working style with strong English communication skills.

Tech Stack

DatadogGoogle Cloud PlatformKubernetesPostgreSQLPrometheusRedisRuby on Rails

Categories

AI & MLBackend