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