Senior Backend Engineer

Peoplebox.ai is a fast-growing, YC-backed start-up building an AI-powered Performance Management platform. We help modern companies drive real business outcomes by aligning people, goals, and feedback all inside everyday tools like Slack, Teams, and email.

Responsibilities

• Build and maintain MVC-based Ruby on Rails applications and RESTful APIs, ensuring code is clean, modular and well-documented.
• Implement and optimize asynchronous jobs using Sidekiq and/or Delayed Job to support long-running or high-volume tasks.
• Leverage Redis for caching, session storage and job management to deliver fast, responsive user experiences.
• Design efficient schemas, write optimised SQL (MySQL or PostgreSQL), and apply indexing and normalisation best practices.
• Architect and iterate on scalable, decoupled systemswhether monolith or microservices, balancing performance, reliability and maintainability.
• Define, document and consume secure, versioned RESTful endpoints that serve both internal and external clients.
• Write and maintain unit/integration tests (RSpec or Minitest), and contribute to CI/CD pipelines for automated builds, tests and deployments.
• Partner with product managers, designers and front-end engineers to translate business requirements into technical solutions. Provide clear, proactive updates on progress, challenges and trade-offs.
  
  

• Ruby on Rails, JavaScript, Python: 3+ years of production-grade experience, strong grasp of MVC conventions and Rails best practices.
• Background Jobs: Hands-on with Sidekiq and/or Delayed Job for asynchronous processing.
• Redis: Proven use for caching, session storage, pub/sub or job queues.
• Relational Databases: Expert in MySQL or PostgreSQL schema design, indexing, and query optimisation.
• API Development: Comfort designing, documenting and securing RESTful APIs.
• System Design: Ability to decompose complex problems, build modular services (microservices a plus) and make trade-off decisions.
• Version Control: Daily use of Git, collaborating via GitHub or GitLab.
• Containerization: Familiarity with Docker for development and production consistency.
• Cloud Services: Working knowledge of AWS (e. g., EC2 S3) or similar.
  
  

• Proven microservices or event-driven architecture experience.
• Experience with infrastructure as code (Terraform, CloudFormation).
• Previous work in fast-paced, product-oriented start-ups.