Sr. Ruby on Rails Developer

Role: Sr. Ruby on Rails Developer with production support Experience

Location: USA - Remote
Employment Type: Contractor

Experience: 10+ Years

Job Summary

CitiusTech is seeking an experienced Sr. Ruby on Rails Developer to support McKesson's application modernization and healthcare platform initiatives. The ideal candidate will be responsible for developing, enhancing, and maintaining enterprise applications, participating in cloud and platform modernization efforts, implementing security upgrades, and delivering high-quality solutions in an Agile environment.

Overview
The work includes product delivery, KTLO/production support, security and compliance remediation, technical debt, migrations, knowledge transfer, and system transition activities. HDS operates a mix of modern and legacy platforms with significant dependencies across APIs, event platforms, databases, identity, infrastructure, and observability.
We are looking for experienced engineers who can independently operate within complex production systems, not entry-level or narrowly focused development resources.
Target Experience

• 7+ years of professional software engineering experience preferred
• Proven experience supporting enterprise production applications
• Ability to independently troubleshoot complex, distributed systems
• Experience taking ownership of established/legacy applications and unfamiliar codebases
• Migration, modernization, platform transition, or application decommissioning experience strongly preferred
• Healthcare, pharmacy, life sciences, or other regulated-industry experience preferred

The 10+ year target is consistent with the P4/Senior Software Engineer experience level

Technical Skills
Candidates should have strong experience in several of the following areas:
Application Engineering

• Ruby/Rails and JavaScript/TypeScript required
• Java/C#/.NET beneficial
• REST APIs and distributed applications
• Automated testing, Git and CI/CD
• System design and application troubleshooting

Integration & Messaging

• Apache Kafka / Confluent Kafka strongly preferred
• Event-driven architectures
• REST/API and enterprise-system integrations
• MuleSoft experience beneficial

Data

• Strong SQL skills
• SQL Server and/or PostgreSQL
• Snowflake, Databricks and ETL/data-pipeline experience valuable for data-focused assignments

Cloud & Operations

• Azure and/or Google Cloud Platform
• Production monitoring, logging and observability
• Production observability experience required. (Datadog experience strongly preferred)
• Production incident troubleshooting and root-cause analysis

These technologies reflect the current HDS landscape, which includes Kafka/Confluent, MuleSoft, Okta/OIDC, SQL Server, PostgreSQL, Oracle, Azure/Google Cloud Platform storage and multiple observability platforms.
Engineering Expectations
Successful contractors must be able to:

• Work independently from Jira backlogs within Agile/Scrum teams
• Diagnose issues across application, API, messaging and database boundaries
• Support production defects, vulnerabilities, technical debt and operational issues
• Understand dependencies and risks before implementing production changes
• Participate in deployments, validation and production support (occasionally after hours)
• Work effectively with Engineering, Product, Platform, SRE, Security and Data teams
• Produce and maintain runbooks, architecture/dependency documentation, troubleshooting guidance and knowledge-transfer materials
• Transfer knowledge effectively to other HDS engineers

HDS's operating model specifically includes production support, security/compliance remediation, defects, technical debt, monitoring/resiliency and customer-impacting issues, with work managed through Jira-based intake, prioritization and team backlogs.