Senior Developer

Description This manufacturing client is seeking a Full-Stack Ruby on Rails Engineer to lead the design and development of web applications supporting energy optimization and grid operations. This role requires deep Rails expertise, strong front-end architecture experience using Hotwire (Turbo & Stimulus), and hands-on AWS deployment experience. The position is a 6-month contract-to-hire with the intent to convert to full-time and work onsite. Skills ruby on rails, hotwire, turbo, stimulus, ux, aws, rspec, data streaming, kafka, kinesis, flink, iot Top Skills Details ruby on rails,hotwire,turbo,stimulus,ux,aws Additional Skills & Qualifications Qualifications: • 9+ years of recent professional experience in full-stack Ruby on Rails development • Expert-level knowledge of the Rails framework (version 7+) and its core libraries • A strong command of automated testing strategies and rools (Rspec, Capybara, etc.) • Experience building modern Rails front-end applications using Turbo and Stimulus • A commitment to good UX principles and an active interest in modern web design • 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 • Excellent communication and interpersonal skills Job 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. • Maintain front-end design standards for aesthetics, usability, and clean markup. • Work with other team members to build beautiful user interfaces. • 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. Differentiators: • Experience deploying containerized Rails applications at scale to AWS cloud services • Figma and graphic design tools • Familiarity with SCADA systems and related protocols (modbus, DNP3, MQTT, etc) • Experience with IoT systems and data streaming applications • Data Streaming (Flink, Kafka, Kinesis, etc.) • Familiarity with Ancillary Servic Experience Level Expert Level Job Type & Location This is a Contract to Hire position based out of Kennett Square, PA. Pay And Benefits The pay range for this position is $80.00 - $80.00/hr. Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following: Medical, dental & vision Critical Illness, Accident, and Hospital 401(k) Retirement Plan - Pre-tax and Roth post-tax contributions available Life Insurance (Voluntary Life & AD&D for the employee and dependents) Short and long-term disability Health Spending Account (HSA) Transportation benefits Employee Assistance Program Time Off/Leave (PTO, Vacation or Sick Leave) Workplace Type This is a fully onsite position in Kennett Square,PA. Application Deadline This position is anticipated to close on May 22, 2026. About TEKsystems We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company. The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law. About TEKsystems And TEKsystems Global Services We're a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We're a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We're strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We're building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at TEKsystems.com. The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law. San Francisco Fair Chance Ordinance: Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records. Massachusetts Lie Detector: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Use of Artificial Intelligence (AI): We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.