Senior Backend Developer

5 days ago

Hanoi Capital Region, Vietnam 8SENECA Full time

We are looking for a 
Senior Backend Developer with deep expertise in Ruby on Rails
 to join our team and help scale our product to the next level. This is an opportunity to make meaningful contributions not just in engineering, but also in shaping product direction and technical architecture.

Responsibilities

  • Design, build, and maintain scalable and high-performance backend systems using Ruby on Rails.
  • Architect and implement APIs (RESTful and gRPC) and ensure seamless integration with front-end and third-party services.
  • Work closely with product managers and designers to translate business requirements into well-architected, tested, and documented code.
  • Solve complex engineering problems related to performance, scalability, concurrency, and distributed systems.
  • Maintain and optimize databases and messaging systems to handle large volumes of data and requests efficiently.
  • Write and maintain unit, integration, and system-level tests to ensure reliability and stability.
  • Contribute to DevOps efforts: containerization, CI/CD pipelines, and cloud infrastructure (preferably on AWS).
  • Take ownership of features and be responsible for their delivery end-to-end.
  • Mentor junior engineers and contribute to a collaborative team culture.

Requirements

  • 5+ years of professional experience with Ruby on Rails
     in production systems with 
    at least one product serving 100K+ users
    .
  • Strong problem-solving skills with a solid understanding of 
    algorithms, data structures, OOP, and system design
    .
  • Deep knowledge of 
    web development principles
     including MVC architecture, RESTful APIs, gRPC, and message brokers like Kafka or RabbitMQ.
  • Proven experience in 
    building distributed systems and microservices
    , and understanding of concurrency models.
  • Familiarity with 
    Docker, CI/CD pipelines
    , and experience deploying applications to 
    AWS or similar cloud providers
    .
  • Experience in writing 
    automated tests
     at different layers of the stack.
  • Strong 
    product mindset
    —you care about user experience, not just code quality.
  • Excellent English communication skills
  • Demonstrated 
    ownership
    , accountability, and responsibility in past roles.
  • Excellent communication skills and a team-first attitude.

Nice to Have

  • Experience in Python
  • Familiarity with event-driven architecture or CQRS patterns.
  • Knowledge of observability tools like Newrelic, Prometheus, Grafana, etc.

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