[Hiring] Full Stack Developer @OneSource Virtual

Role Description

OneSource Virtual is seeking a Full Stack Developer to join our product engineering team. This is a staff-level individual contributor role for a developer who can work independently across the full stack, deliver high-quality features with no supervision, and actively contribute to the team’s technical direction. You will build and maintain software across C#/.NET services, React UI, and SQL on platforms that process over $200 billion in compliant payroll and tax payments annually.

We are an AI-first engineering organization. The expectation at this level is not just that you use AI tools — it is that you use them fluently, set a good example for less experienced teammates, and contribute to how the team evolves its AI-assisted practices over time.

Responsibilities

• Development
  • Execute all phases of the software development lifecycle — design, development, testing, bug fixes, refactoring, and technical debt reduction.
  • Work full stack stories independently using simple, clean design solutions with a low defect rate.
  • Implement software using the Microsoft stack (C#/.NET, Entity Framework, MVC) deployed in Azure/AWS cloud environments.
  • Build and consume REST and SOAP web services; develop and maintain React front-end components.
  • Perform data modeling tasks that match established best practice patterns and standards.
  • Participate actively in work breakdown — asking questions, completing work plans, and surfacing potential problems before they arise.
  • Demonstrate the ability to lead swarming efforts on complex user stories.
  • Assist teammates, offer constructive feedback, and contribute to team-wide quality improvement.
• AI-Assisted Development
  • Use AI coding tools (Windsurf, Claude Code, Cursor, or equivalent) fluently as a standard part of daily work — code generation, debugging, test writing, code review, and understanding unfamiliar codebases.
  • Apply AI tools to improve delivery speed and code quality, not as a substitute for understanding the code you ship.
  • Review and validate all AI-generated output before committing; set a visible standard for responsible AI use on the team.
  • Offer informal guidance to associate-level developers on effective and responsible AI tool usage.
  • Contribute to evolving team norms around AI tooling as practices and tooling change.
• Agile & Collaboration
  • Be an active, contributing member of an Agile Scrum team — write stories, groom the backlog, and engage in all sprint ceremonies.
  • Work closely with the development manager, technical lead, product owner, and scrum master to meet project commitments.
  • Set accurate time estimates for work assigned to your area of knowledge and adjacent areas.
  • Communicate proactively when timelines are at risk; work is thorough, complete, and of high quality.
  • Learn and integrate platform-specific knowledge — Workday, Salesforce, and OSV’s payment and tax domain — as part of your ongoing development.

Qualifications

• Bachelor’s degree in Computer Science, MIS, or a related technical field.
• 3+ years of experience developing applications using the Microsoft stack (C#/.NET, Entity Framework, ADO.NET, MVC).
• 2+ years of experience building and consuming SOAP/REST web services.
• 2+ years of experience developing against relational databases with SQL.
• Experience with Agile/Scrum development methodology.
• Experience working in a CI/CD environment.
• Demonstrated, hands-on daily use of AI coding tools (Windsurf, Claude Code, Cursor, or equivalent) — fluent usage is expected at this level, not a nice-to-have.
• Able to write effective prompts for code generation, refactoring, debugging, and test creation.
• Understands the limitations of AI-generated code and applies appropriate review rigor before committing.
• Comfortable discussing AI tool usage and contributing to team standards around it.

Requirements

• React or front-end JavaScript framework experience.
• Experience with Salesforce development (APEX, SOQL, Lightning components).
• Familiarity with Workday integrations or HCM platforms.
• Experience with cloud platforms (AWS, Azure) and cloud-native application patterns.

What You’ll Grow Into

This role sits on OSV’s Associate → Full Stack → Senior Full Stack career path. Progression to Senior is competency-based: developers who demonstrate independent full stack delivery, mentorship of junior teammates, and leadership in story breakdown and swarming advance to the Senior level. Technical leads and architects are embedded in every team to support that growth.