Senior .NET Software Engineer

About AccuSourceHR

We are a full-service employment screening organization with HQ in Phoenix, Arizona. Since 1999, we've combined innovative technology with high-quality, US-based client care. Our culture is built on collaboration, continuous learning, and a commitment to excellence, ensuring our team feels valued, supported, and empowered.

Role Summary

We're building the future of background screening and HR workflows, and we're doing it with a small, AI-native engineering team. You'll own a customer-facing .NET platform end-to-end, ship integrations that real businesses depend on, and help shape what modern agentic development looks like in production.

This is a builder's seat with real autonomy. Agentic development is core to how we work — Claude Code, Cursor, and Copilot are how we understand systems, design solutions, and ship features. We hire for AI fluency because it's how a small team delivers like a much larger one.

If working this way energizes you, we'd love to talk.

Key Responsibilities

• 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.

Required Qualifications

• 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)

Preferred Qualifications

• HCM/HRIS domain experience (ATS, onboarding, payroll, benefits, time & attendance)
• Payroll integration experience (mapping, reconciliation, auditability)
• Microservices, event-driven architectures, or message queues in production
• Observability practice — distributed tracing, structured logging, metrics
• Cloud experience with Azure or AWS (App Services, ECS, Lambda, Functions)
• SOC 2 or regulated-data environments
• Mentorship or end-to-end product ownership

Key Responsibilities

• 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

Required Qualifications

• 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)

Preferred Qualifications

• HCM/HRIS domain experience (ATS, onboarding, payroll, benefits, time & attendance)
• Payroll integration experience (mapping, reconciliation, auditability)
• Microservices, event-driven architectures, or message queues in production
• Observability practice — distributed tracing, structured logging, metrics
• Cloud experience with Azure or AWS (App Services, ECS, Lambda, Functions)
• SOC 2 or regulated-data environments
• Mentorship or end-to-end product ownership

Benefits

• 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

Salary

4,240–6,360EUR gross/month depending on experience.

Physical Requirements

• Ability to commute to our Vilnius office 2 times / week.
• Ability to participate in a shared weekly on call rotation as part of the team’s operational support responsibilities.
• A dedicated and ergonomic workspace at home conducive to focused work, including proper seating and desk setup.
• Access to a stable and reliable high-speed internet connection.
• Adequate lighting and minimal background noise to support professional video calls and meetings.
• Ability to lift and carry up to 5 pounds occasionally, for tasks such as setting up a workstation or equipment.

Equal Employment Opportunity

AccuSourceHR, Inc. provides equal employment opportunities to all employees and applicants without regard to race, color, religion, sex, national origin, age, disability, genetic information, pregnancy, gender identity, sexual orientation, veteran status, or any other characteristic protected by federal, state, or local law.

AccuSourceHR, Inc. may modify, interpret, or apply this job description as needed. It is informational only and does not constitute an offer or guarantee of employment.

Any employment offer is contingent upon successful completion of a background investigation.

By submitting an application and/or accepting a position, you acknowledge that, if selected, you will be required to electronically sign employment‑related documents, including but not limited to the offer letter, employment agreement, and other necessary forms.

This job description is not designed to cover or contain all job duties required of the employee. There may be additional activities, duties and/or responsibilities that are required for this position that are not listed in this job description.