Ruby/Rails -Deployed Engineer

HiHope you are doing greatSenior Forward-Deployed Engineer — Next.js Legacy ModernizationLocation: United States — remote, with occasional customer-site travelEngagement: Sophus consultant supporting Vercel-led enterprise engagementsLevel: Senior, hands-on individual contributorRole missionHelp enterprise customers modernize legacy Ruby/AWS applications into production-grade Next.js applications running on Vercel.You will work alongside a named Vercel Forward-Deployed Engineer who provides technical architecture and delivery assurance. You and the Sophus team will execute the assessment, migration, engineering, testing, CI/CD, deployment, and stabilization work.This is not an advisory-only or front-end UI role. You must be comfortable entering an ambiguous legacy environment, defining an incremental migration path, writing production code, and owning delivery outcomes.Responsibilities● Assess legacy Ruby/Rails applications, AWS architecture, dependencies, APIs, data flows, infrastructure, deployment pipelines, and technical debt.● Translate the assessment into an incremental migration strategy with defined workstreams, risks, acceptance criteria, coexistence patterns, cutover plans, and rollback procedures.● Modernize legacy front ends and monolithic applications to React, TypeScript, Next.js, and Vercel.● Build production applications using Next.js App Router, React Server Components, SSR, SSG, ISR, streaming, caching, and personalization.● Preserve necessary Ruby/Rails and AWS services during staged migration while progressively moving appropriate workloads to Vercel.Required experience● 6+ years of professional software-engineering experience.● At least 2 years in a customer-facing technical role such as consulting, professional services, solutions architecture, or forward-deployed engineering.● Expert-level TypeScript and strong React engineering experience.● Deep, recent, production-level Next.js experience.● Proven ownership of at least one substantial legacy-application or large-codebase migration.● Strong understanding of incremental modernization rather than only “big-bang” rewrites.Strongly preferred● Direct production experience deploying applications on Vercel.● Ruby/Rails-to-Next.js modernization experience.● Migration from Pages Router to App Router.● Vercel AI SDK, AI Gateway, eve, Fluid Compute, Workflows, Sandbox, and Observability.● Experience with high-volume retail, e-commerce, media, healthcare, or financial-services applications.● Enterprise security, compliance, identity, and multi-region deployment experience.● AI-assisted migration or code-transformation automation experience.Candidates must be prepared to present:1. One legacy-modernization case study, including the original architecture, target architecture, migration stages, risks, and their personal contribution.2. One production Next.js application or migration they personally designed and delivered.3. One CI/CD, deployment, or production incident they personally resolved.4. One production AI-agent, AI application, or agent-framework example.5. Measurable results such as migration time, deployment-frequency improvement, performance gain, reduced infrastructure cost, or Core Web Vitals improvement.Technical evaluation