Senior Full Stack Engineer – Vialto Rewards -

Vialto is a market leader in global mobility services. Our purpose is to ‘Connect the world’. We are unique and the only stand-alone global mobility business. This presents a rare opportunity for our clients, stakeholders and colleagues. Our teams help companies streamline and effectively manage their global mobility programs in a cost-efficient and compliant manner. Our services focus on providing cross-border compliance and risk assessment for tax, immigration, business travel, rewards and compensation, and remote work.

Working at Vialto is about getting the chance to be part of a global and dynamic team. Globally, Vialto has over 8,000 staff and continues to grow. You will work with clients from a range of industries and different geographical locations. We believe in connecting the world and supporting our colleagues to do the same in their careers by undertaking assignments and opportunities globally that broaden their skills and ultimately benefit our clients. Vialto is unstoppable when we work together in a culture of belonging, where everyone can thrive. We encourage employees to bring their true selves and share their unique talents and expertise to positively impact the communities we serve.

Role Summary: Vialto is hiring a Senior Full Stack Engineer to design, build, and operate secure, scalable products that power our Compensation Collection, Shadow Payroll, and Equity offerings for the world’s most complex multinational employers. You will deliver hands-on engineering across Next.js and React front ends and C# and .NET services running on Microsoft Azure, working in a highly regulated, multi-jurisdictional environment where accuracy, auditability, and data privacy are non-negotiable.

What You’ll Do:

• Build and evolve modern web experiences for Compensation Collection, Shadow Payroll, and Equity products using Next.js, React, and TypeScript with a focus on performance, reliability, and clarity for tax, payroll, and mobility operators.
• Design and implement backend services and APIs using C#, .NET, and WebAPI to support compensation data ingestion, cross-border payroll calculations, equity event processing, and integrations with client HR, payroll, and equity administration systems.
• Deliver Azure-native implementations of shadow payroll calculation engines, compensation aggregation pipelines, and equity tax event workflows using Microsoft PaaS services, secure patterns, and operational best practices.
• Contribute to system architecture and technical design for multi-country payroll, compensation, and equity domains, including integration patterns using REST, file-based feeds, and event-driven approaches.
• Own production readiness for your work including logging, monitoring and alerting, reconciliation tooling, incident response support, and operational documentation.
• Apply secure development practices appropriate for handling sensitive compensation, payroll, and equity data including privacy, auditability, segregation of duties, and country-specific data protection requirements.
• Partner with product, mobility tax, payroll, and equity subject-matter experts to translate complex regulatory and client requirements into technical plans and deliverables.
• Use agentic development practices including agent-driven development with Claude Code, Codex, or similar AI coding agents to accelerate design, implementation, testing, and operations across the SDLC.
• Work in a spec-driven development workflow, authoring detailed specifications that guide both human and AI agent implementation.
• Design and implement AI-powered features within Compensation Collection, Shadow Payroll, and Equity products.
• Evaluate, integrate, and operationalize AI APIs, models, and toolchains within application architectures.
• Mentor and support other engineers through code reviews, pairing, and technical guidance on payroll, compensation, and equity domain patterns.

Required Qualifications:

• 5+ years professional software development experience building enterprise web applications and services.
• Strong experience designing and building large JavaScript applications with Next.js and/or React.
• Strong backend development experience in C# and .NET.
• Proven experience with Microsoft Azure designing and building cloud solutions.
• Experience delivering systems in regulated or compliance-oriented environments.
• Strong engineering fundamentals including design patterns, separation of concerns, scalable architecture, and pragmatic trade-offs.
• Experience with agentic or AI-assisted development workflows.
• Demonstrated ability to build products that incorporate AI capabilities.

Preferred Qualifications:

• Direct experience building or integrating with payroll, shadow payroll, compensation collection, equity administration, or global mobility tax platforms.
• Familiarity with cross-border compensation concepts.
• Experience integrating with HCM, payroll, and equity systems.
• Azure certifications and/or Microsoft certifications.
• Experience with event-based and distributed systems.
• Data and persistence experience with SQL Server and ORMs.
• Strong testing discipline including TDD and BDD.
• Experience building analytics and reporting with BI and data visualization tools.
• Exposure to mobile ecosystems and API design supporting mobile clients.

Education: Bachelor’s degree in computer science, Engineering, or related field required. Master’s degree preferred.

Why This Role: You’ll help build and scale the technology behind Compensation Collection, Shadow Payroll, and Equity. You’ll modernize and operate a platform that sits at the intersection of complex tax regulations, sensitive financial and personal data, and high-stakes global payroll and equity events. You’ll also work at the forefront of AI-augmented engineering, using agentic development practices and building AI-powered product experiences.