Onsite_Ruby on Rails Engineer_Austin, TX ||Sunnyvale, CA|| Sacramento, CA

THEMESOFT; Sacramento (CA); On-site; USD 96,000 - 193,000; Part time

Job summary

The Themesoft Inc. is seeking a Senior Software Engineer specializing in Ruby on Rails for an onsite contract role.

You will design, implement, and optimize web applications across the full stack (Ruby on Rails, front-end with HTML/CSS/JS, APIs) in Austin, Sunnyvale, or Sacramento. Responsibilities include building scalable services, collaborating with partners and vendors, ensuring performance, data quality, and thorough documentation.

Qualifications

• 6+ years in a senior software engineering role.
• 6+ years of the Ruby on Rails framework and Ruby as a core language.
• 6+ years of API design and interface technologies (JSON, REST, RPC, XML).
• 6+ years of front-end development (HTML, CSS, JavaScript, React) and database design and queries (PostgreSQL, MySQL, etc.).
• Knowledge of integrating GenAI into development workflows.

Responsibilities

• Design, code, test, and implement large-scale web applications and components across the full stack (front-end GUI and backend).
• Troubleshoot and resolve issues around performance, response times, capacity, and system limitations.
• Collaborate with internal business partners, internal technology resources, and external vendors; maintain applications and ensure data quality, integrity, and consistency.
• Create and maintain documentation for the applications you build.

Skills

Ruby on Rails

Front-end development

API design

GenAI in development workflows

Analytical & communication skills

Tools

GoLang

Java

AWS

CI/CD

RSpec

Job description

Onsite_Ruby on Rails Engineer_Austin, TX ||Sunnyvale, CA|| Sacramento, CA

Job Id : OOJ - 27946

Posted Date : 11/03/2026

Experience : 6-6

Job Type : Contractual

Location : SACRAMENTO,Austin, TX,Sunnyvale, CA

Overview

Job Title: Ruby on Rails Engineer
Onsite role
Location: Austin, TX/Sunnyvale, CA/Sacramento, CA
Duration: 6-12+ months
Contract

Role Description

We are seeking a Senior Software Engineer responsible for the development and design of web applications and components across both front-end (GUI) and backend. You will design, code, test, and implement websites and applications for internal or external use, and troubleshoot issues around performance, response times, capacity, and system limitations. You’ll collaborate with internal business partners, internal technology resources (database, system, networking), and external vendors, and ensure data quality, integrity, and consistency across the organization.

Responsibilities

• Design, code, test, and implement large-scale web applications and components across the full stack (front-end GUI and backend).
• Troubleshoot and resolve issues around performance, response times, capacity, and system limitations.
• Collaborate with internal business partners, internal technology resources, and external vendors; maintain applications and ensure data quality, integrity, and consistency.
• Create and maintain documentation for the applications you build.

Preferred Qualifications

• Testing, CI, and DevOps - working knowledge of integrated testing frameworks (RSpec, MiniTest), CI suites (CircleCI, Jenkins), and DevOps and AWS infrastructure.
• GoLang and Java - expert knowledge of GoLang, Java, or a similar compiled, high- concurrency, lower-level language (Erlang, C++, Rust, etc.).
• Analytical, Problem Solving, and Communication Skills - excellent analytical, problem- solving, and communication skills, including cross-functional collaboration and relationship building.

Minimum Qualifications

• 6+ years in a senior software engineering role.
• 6+ years of the Ruby on Rails framework and Ruby as a core language.
• 6+ years of API design and interface technologies (JSON, ProtoBuf, REST, RPC, XML, etc.).
• 6+ years of front-end development (HTML, CSS, JavaScript, React) and database design and queries (PostgreSQL, MySQL, etc.).
• Knowledge of integrating GenAI into development workflows.