Principal - Solution Architect, Software Engineering

About Slalom

Slalom is a global, human‑centric business and technology consulting firm. We specialise in partnering with organisations that aspire to excellence, helping them tackle complex challenges and achieve transformative results through strategy, technology, and business transformation services. By prioritising people, Slalom creates a unique consulting experience, with a team of strategists and engineers delivering practical, end‑to‑end solutions that drive impactful outcomes for our clients. We empower people and organisations to dream bigger, move faster, and build better tomorrows for all.

Who You’ll Work With

Slalom Build capability is Slalom’s technology powerhouse, dedicated to engineering, cutting‑edge technologies, and modern development practices. We embrace diversity of thought and background, fostering a culture that values creativity and collaboration. As a trusted partner, Slalom Build helps clients maximise the value of their software by delivering fast, high‑quality, and consistent solutions. We combine strategic thinking with AI‑driven tools to support end‑to‑end delivery at any scale. Our focus is not only on building great solutions, but also on empowering people and creating lasting impact.

What You’ll Do

Lead comprehensive codebase and database inventories using static analysis tooling, quantifying code composition, identifying architectural patterns and anti‑patterns, and distinguishing auto‑generated code from hand‑written business logic

Conduct deep‑dive code quality analysis, evaluating complexity hotspots, maintainability, and technical debt to inform stabilization priorities and documentation effort estimates

Assess the full application stack for modernization readiness, including frontend technologies, backend and service layer architecture, authentication and authorization flows, data layer complexity, and external system integrations and cataloguing dependencies, deprecated protocols, and third‑party components

Design the target modern architecture, defining technology choices, state management, API layer patterns, authentication strategy, and component library approach for a React‑based SPA

Evaluate migration patterns and recommend a phased modernization strategy informed by module dependencies, complexity scoring, and effort estimation

Co‑create application module and domain maps to evaluate codebase suitability for AI‑assisted tooling

Participate in vendor knowledge transfer sessions as the primary technical representative and contribute technical risk assessments to the consolidated risk register

Present technical findings and recommendations in executive readouts and deep‑dive sessions with client teams

What You’ll Bring

12+ years of software architecture and engineering experience

Deep expertise in .NET Framework: must be able to read, understand, and assess Web Forms (code‑behind, ViewState, page lifecycle), MVC (controllers, Razor views), and legacy patterns common in 15‑20 year old applications

Back‑end/API design experience: RESTful API design, authentication/authorization patterns (OAuth 2.0, OpenID Connect, JWT), session‑to‑token migration strategies

Experience with legacy application modernization: experience migrating server‑rendered .NET applications to modern SPA frameworks

Experience with static code analysis tools (SonarQube, NDepend, or equivalents)

Strong architectural documentation skills: ability to produce clear architecture diagrams (C4 model preferred), complexity heat maps, and technical assessment reports

Experience with migration patterns and when to apply them: strangler fig, micro‑frontends, API gateway patterns, parallel running strategies

Demonstratable hands‑on experience with AI‑assisted development tools

Nice to Have

Experience with TypeScript

Ability to reverse‑engineer undocumented systems: extract architecture, patterns, and business rules from code in the absence of documentation

Experience with reporting migration (SSRS, Crystal Reports)

Familiarity with AI‑assisted development tools for code analysis and documentation

Experience with third‑party .NET UI controls (Telerik, DevExpress, Infragistics) and their React equivalents

Cloud architecture experience

Experience with SignalR/WebSocket migration to React real‑time patterns

Performance engineering experience: ability to identify and plan for performance‑critical migration areas

Experience in React must be able to design a production‑grade React architecture including state management, component design patterns, routing, build tooling, and API integration patterns

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