Senior Ruby on Rails Lead Engineer

Role: Senior Ruby on Rails Lead Engineer

Location: Portsmouth, NH (On-Site)

Contract Role
 

Job Summary

We are seeking an experienced Senior Ruby on Rails Lead Engineer to design, develop, and maintain scalable, secure, and high-performance web applications. The ideal candidate will have strong expertise in Ruby on Rails, API development, system architecture, cloud technologies, and database optimisation, along with proven technical leadership and mentoring skills.

The candidate will lead technical design decisions, ensure code quality, collaborate with cross-functional teams, and support cloud deployments and production troubleshooting.

Key Responsibilities

• Design, develop, enhance, and maintain web applications using Ruby on Rails.
• Build and support RESTful APIs, microservices, and integrations with internal and external systems.
• Lead system design and architecture discussions to deliver scalable, secure, and high-performing applications.
• Optimise application performance, database queries, and overall code quality.
• Work with PostgreSQL, MS SQL Server, Redis, and Sidekiq.
• Support AWS cloud deployments, Cloud Foundry, Docker, and CI/CD pipelines.
• Conduct code reviews, mentor developers, and establish software engineering best practices.
• Develop and maintain automated tests using RSpec and other testing frameworks.
• Monitor applications, analyse logs, and troubleshoot production issues using Splunk.
• Collaborate with product owners, architects, and cross-functional teams in an Agile environment.
• Apply object-oriented programming principles, design patterns, and SOLID principles.
• Ensure application security, reliability, maintainability, and performance.

Required Skills and Qualifications

• Strong software development experience with expertise in Ruby on Rails.
• Extensive experience in REST API development, microservices, and system integrations.
• Strong knowledge of PostgreSQL, MS SQL Server, Redis, and Sidekiq.
• Hands-on experience with AWS, Cloud Foundry, Docker, and CI/CD pipelines.
• Strong understanding of system design, software architecture, OOP, design patterns, and SOLID principles.
• Proficiency with Git, RSpec, automated testing, and Agile methodologies.
• Experience with application monitoring, log analysis, and production support using Splunk.
• Strong troubleshooting, problem-solving, communication, and collaboration skills.
• Ability to provide technical leadership, conduct code reviews, and mentor engineering teams.

Preferred Skills

• Experience leading development teams and mentoring engineers.
• Exposure to Kubernetes, Kafka, GraphQL, and Terraform.
• Experience with Elasticsearch and OpenSearch.
• Knowledge of application security, OAuth 2.0, and JWT authentication.
• Familiarity with cloud-native architectures and scalable distributed systems.

Important Onboarding Requirements

• A background check is mandatory.
• All selected candidates must attend a meet-and-greet session before starting the assignment.
• Candidates must be willing to visit the nearest Capgemini office, client location, or designated onsite location, as directed by the project team.
• Travel expenses for non-local candidates will be covered by Capgemini.
• If a candidate declines the offer after selection when travel has been arranged, the vendor will be responsible for the travel costs.