Senior Ruby on Rails Developer

Caterpillar Financial Services Corporation; Kennett Square (Chester County); On-site; USD 113,000 - 183,000; Full time

Benefits offered by this job

Medical, dental, and vision

401(k) savings plans

Health Savings Account

Flexible Spending Accounts

Career development

Paid time off

Job summary

Tangent Energy Solutions, a Caterpillar subsidiary, seeks a Senior Ruby on Rails Developer to design and scale data-intensive web applications in the energy space. This full-time, in-office role is based at Kennett Square, PA, requiring Rails 7+ proficiency, AWS deployment experience, and the ability to build ML-ready data pipelines.

You will mentor junior developers, write automated tests, and contribute to DevOps tasks while advancing AI-assisted software development initiatives.

Qualifications

• Expert-level knowledge of the Rails framework (version 7+)
• Strong command of automated testing strategies and tools (RSpec, Capybara)
• Experience with automated testing for front- and back-end functionality
• Understanding of web app architecture, object-oriented programming, and design patterns
• Proficiency using Git and GitHub Enterprise with GitHub Actions
• Applied understanding of AI-assisted development and managing AI-assisted developers
• Excellent communication and interpersonal skills

Responsibilities

• Design, develop and maintain Ruby on Rails applications in the energy space
• Collaborate with business and operational stakeholders to define, plan, and deliver new features
• Design and implement ML-ready data pipelines
• Participate in the design and architecture of new systems and applications
• Ensure code quality and maintainability by writing tests and code reviews
• Assist in shared DevOps duties including infrastructure management and code deployment
• Rearchitect and refactor core application components for efficiency and to reduce technical debt
• Troubleshoot and resolve complex technical issues
• Provide guidance and mentorship to junior developers
• Use AI coding tools to analyze, specify, and implement complex new software features
• Develop AI skills and tools to improve development efficiency and document processes

Skills

Rails framework

RSpec & Capybara

Automated testing

OOP/Design patterns

Git & GitHub Enterprise

GitHub Actions

AI-assisted development

Communication skills

Tools

AWS

GitHub Enterprise

CI/CD tooling

Job description

Career Area:

Technology, Digital and Data

Job Description:

Your Work Shapes the World at Caterpillar Inc.

When you join Caterpillar, you're joining a global team who cares not just about the work we do – but also about each other. We are the makers, problem solvers, and future world builders who are creating stronger, more sustainable communities. We don't just talk about progress and innovation here – we make it happen, with our customers, where we work and live. Together, we are building a better world, so we can all enjoy living in it.

About Tangent Energy Solutions:

Tangent Energy Solutions is a wholly owned subsidiary of Caterpillar, a global leader in the manufacturing of construction and mining equipment, diesel and natural gas engines, industrial gas turbines, and diesel-electric locomotives. Headquartered in Kennett Square, Pennsylvania, Tangent Energy Solutions was established in 2009 to provide innovative energy solutions for commercial and industrial customers.

We are looking for an experienced Senior Ruby on Rails Developer to join our team. The ideal candidate will have a deep understanding of the Ruby on Rails framework and experience working with data-intensive, business-oriented web applications. Additionally, the candidate must have experience with deploying infrastructure and code at scale to AWS cloud services. This is a full-time, in-office role, reporting Monday through Friday to our office in Kennett Square, Pennsylvania.

What You Will Do:

• Design, develop and maintain Ruby on Rails applications in the energy space

• Collaborate with business and operational stakeholders to define, plan, and deliver new features

• Design and implement ML-ready data pipelines

• Participate in the design and architecture of new systems and applications

• Ensure code quality and maintainability by writing tests, conducting code reviews, and following industry best practices

• Assist in shared DevOps duties including infrastructure management and code deployment

• Rearchitect and refactor core application components for efficiency improvements and to reduce technical debt

• Troubleshoot and resolve complex technical issues

• Provide guidance and mentorship to junior developers

• Use AI coding tools to analyze, specify, and implement complex new software features

• Develop AI Skills and tools to improve the efficiency of our development process, to explore new avenues for development, and to document existing processes and code

Required Proficiencies:

• Expert-level knowledge of the Rails framework (version 7+) and its core libraries

• A strong command of automated testing strategies and tools (Rspec, Capybara, etc.)

• Experience with and commitment to automated testing for both front- and back-end functionality

• Strong understanding of web application architecture, object-oriented programming, and design patterns

• Proficiency using git and experience with GitHub Enterprise and GitHub actions

• Applied understanding of agentic development and experience managing and reviewing the work of AI-assisted developers

• Excellent communication and interpersonal skills

What Will Put You Ahead:

• 9+ years of recent professional experience in full-stack Ruby on Rails development

• Experience deploying containerized Rails applications at scale to AWS cloud services

• Experience with IoT systems and edge computing

• Expertise in Data Streaming technologies such as Flink, Kafka, Kinesis, etc

• Understanding of common ML workflows and off-the-shelf ML tools, especially in the AWS ecosystem

• Familiarity with Ancillary Services in the energy market

• Experience with generator and energy storage control systems

What You Will Have:

Software Development: Knowledge of software development tools and activities; ability to produce software products or systems in line with product requirements.

• Conducts walkthroughs and monitors effectiveness and quality of the development activities.

• Elaborates on multiple-development toolkits for traditional and web-based software.

• Has participated in development of multiple or large software products.

• Contrasts advantages and drawbacks of different development languages and tools.

• Estimates and monitors development costs based on functional and technical requirements.

• Provides consulting on both selection and utilization of developers' workbench tools.

Software Development Life Cycle: Knowledge of software development life cycle; ability to use a structured methodology for delivering and managing new or enhanced software products to the marketplace.

• Describes similarities and differences of life cycle for new product development vs. new release.

• Identifies common issues, problems, and considerations for each phase of the life cycle.
  Works with a formal life cycle methodology.

• Explains phases, activities, dependencies, deliverables, and key decision points.

• Interprets product development plans and functional documentation.

Software Integration Engineering: Knowledge of software integration processes and functions; ability to design, develop and maintain interfaces and linkage to alternative platforms and software packages.

• Has experience with designing data exchange interfaces to and from software product.

• Describes tools and techniques for extraction, transformation and loading of electronic data.

• Cites examples of common linkage requirements for software products and vendors.

• Works with integrating software into the customer or partner framework and infrastructure.

• Participates in the development of technology interfaces and bridges.

Software Product Design/Architecture: Knowledge of software product design; ability to convert market requirements into the software product design.
Demonstrates experience with the architecture and design of major or multiple products.

• Describes major software architecture alternatives and considerations.

• Explains design considerations for commercial database systems, operating systems and web.

• Displays experience in estimating the cost of a specific design of a proposed product.

• Facilitates design reviews and walkthroughs.

• Analyzes benefits and drawbacks of specific software designs and architecture.

Software Product Technical Knowledge: Knowledge of technical aspects of a software products; ability to design, configure and integrate technical aspects of software products.

• Maintains and utilizes data related to install base configurations and environments.

• Solicits customer feedback; reports and monitor bugs and implementation issues.

• Participates in defining and conducting technical acceptance tests.

• Participates in creating technical requirements for software development and deployment.

• Explains basic environment and product configuration options.

Software Product Testing: Knowledge of software product testing; ability to design, plan, and execute testing strategies and tactics to ensure software product quality and adherence to stated requirements.

• Participates in test readiness reviews, functional, volume, and load testing.

• Describes ​​key features and aspects of a specific testing discipline or methodology.

• Tests software components for compliance with functional requirements and design specifications.

• Explains procedures for documenting test activities and results (e.g. errors, non-conformance, etc.)

• Conducts functional and performance testing on parts of assigned products.

Additional Information:

• Relocation will be considered for this position.

• Visa Sponsorship is not available for this position

• This position requires the candidate to work a 5-day‑a‑week schedule in the office.

This position requires working onsite five days a week.Visa Sponsorship is not available for this position.

Summary Pay Range:

$112,710.00 - $183,140.00

Compensation and benefits offered may vary depending on multiple individualized factors, job level, market location, job‑related knowledge, skills, indivdiual performance and experience. Please note that salary is only one component of total compensation at Caterpillar.

Benefits:

Subject to plan eligibility, terms, and guidelines. This is a summary list of benefits.

• Medical, dental, and vision benefits*

• Paid time off plan (Vacation, Holidays, Volunteer, etc.)*

• 401(k) savings plans*

• Health Savings Account (HSA)*

• Flexible Spending Accounts (FSAs)*

• Health Lifestyle Programs*

• Employee Assistance Program*

• Voluntary Benefits and Employee Discounts*

• Career Development*

• Incentive bonus*

• Disability benefits

• Life Insurance

• Parental leave

• Adoption benefits

• Tuition Reimbursement

* These benefits also apply to part‑time employees

Posting Dates:

September 8, 2026 - September 22, 2026

Any offer of employment is conditioned upon the successful completion of a drug screen.

Caterpillar is an Equal Opportunity Employer, Including Veterans and Individuals with Disabilities. Qualified applicants of any age are encouraged to apply.