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Paychex

Senior .NET Software Engineer

Paychex

Senior .NET Software Engineer overseeing a multi-module .NET application while mentoring teammates and enhancing customer-driven features based on feedback.

Posted 5/19/2026full-timeVilnius • 🇱🇹 LithuaniaSenior💰 €4,240 - €6,360 per monthWebsite

Tech Stack

Tools & technologies
ASP.NETMySQL.NETReactSQLTypeScript

About the role

Key responsibilities & impact
  • Own the platform end-to-end. A multi-module .NET application serving real customers. You operate it, evolve it, and help decide where it goes next.
  • Build integrations that matter. Background screening, payroll, and the next provider on the roadmap. Reliable, observable, and built to handle real-world edge cases.
  • Ship customer-driven features. Feedback comes in, features go out. We work in tight feedback loops with our customers and product team.
  • Run an agentic workflow. Use AI agents to explore code, design systems, generate tests, and accelerate delivery.
  • Help define the playbook the rest of the team will adopt.
  • Own quality without a safety net. Automated tests and CI gates are how we ship with confidence. No QA team — quality is part of the engineering job.
  • Lead technically. Write design docs, run design reviews, mentor teammates, and communicate clearly with both engineers and non-technical stakeholders.

Requirements

What you’ll need
  • 7+ years shipping production .NET applications (C#, ASP.NET Core, EF Core)
  • 3+ years building frontends with React and TypeScript in production
  • Strong fundamentals: API design, debugging, performance optimization, clean code
  • Deep relational database experience (SQL Server and/or MySQL) — schema design, query tuning, migrations
  • Experience designing and consuming REST APIs with strong patterns around auth, versioning, retries, and idempotency
  • Automated testing and CI/CD as a default — you write tests alongside features, not after
  • Daily agentic development practice — you can walk us through your workflow and the impact it has on your output
  • Strong written communication (design docs, ADRs, async updates)

Benefits

Comp & perks
  • Industry-leading health insurance plan from day one.
  • Free parking at the office.
  • Hybrid work setup (because flexibility matters) - up to 3 days/week remote.
  • Space to grow, experiment, and make a real impact.
  • Work with a team of curious, kind, and driven humans.
  • Snacks, coffee, and good vibes always stocked.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
.NETC#ASP.NET CoreEF CoreReactTypeScriptSQL ServerMySQLAPI designautomated testing
Soft Skills
strong written communicationmentoringtechnical leadershipcollaborationcustomer-driven focusdesign documentationfeedback loopsclear communication