Principal Full-Stack Engineer

FinOpsly is the AI brain behind cost decisions across  cloud ,  data , and  AI  — built to think, plan, and act. Purpose-built for today’s complex enterprise environments, we  unify  FinOps across AWS, Azure, Snowflake, Databricks, and modern AI workloads — enabling organizations to move from cost reporting to cost action.Role SummaryWe are seeking a Principal Full-Stack Engineer to lead the re-architecture of our PHP-based SaaS application into a modern, scalable, and robust Next.js/Node.js platform. This role blends the depth of an architect with the execution ability of a senior engineer. You will set the technical direction, design the new architecture, and also be an active contributor—writing code, reviewing code, and driving implementation.This is not a pure design role. You will be expected to lead by doing , ensuring scalability, performance, and reliability while guiding a small team to deliver at startup velocity.What You’ll do:Analyze the current PHP application and identify scalability, performance, and reliability gaps.Design a Next.js/Node.js-based SaaS architecture that supports multi-tenancy, scale, and high availability.Define and enforce best practices for modular, secure, and maintainable full-stack development.Establish standards for APIs, services, and system interoperability.Actively contribute to the codebase, building core modules and reviewing critical code.Optimize front-end rendering (Next.js SSR/SSG) and backend APIs (Node.js/TypeScript) for efficiency and performance.Implement scalable service and data interaction patterns for high-throughput SaaS workloads.Collaborate with Data Engineering and DevOps to establish CI/CD pipelines, automated testing, monitoring, and deployments.Ensure iterative delivery while laying the foundation for long-term scalability.Leadership & DeliveryLead a small team of engineers through design, migration, and delivery.Mentor and guide the team on modern full-stack development practices.Partner with product and stakeholders to align technical architecture with business goals.Ensure iterative delivery of improvements while building for long-term scalability.What You’ll Bring8+ years of full-stack engineering experience, with 5+ years in SaaS development.Proven expertise in Next.js (SSR, SSG, API routes) and Node.js (Express/NestJS or similar).Strong backend architecture skills with a deep understanding of scalable service and data design.Experience with multi-tenant SaaS architectures and performance optimization.Proficiency in TypeScript, REST/GraphQL APIs, and modern state management.Hands-on experience with AWS, Azure, or GCP.Strong debugging and optimization experience across frontend, backend, and data layers.Ability to set technical direction at a principal level while actively delivering code.Preferred:Experience migrating legacy systems to modern stacks.Familiarity with microservices, event-driven, or serverless architectures.Exposure to infra-as-code (Terraform, Helm) and CI/CD automation.Experience with compliance-driven SaaS (SOC2, GDPR, HIPAA).Success CriteriaCurrent system gaps in scalability, performance, and reliability are analyzed and documented, with a clear migration plan defined.A modern Next.js/Node.js SaaS architecture is designed and implemented, supporting multi-tenancy, scale, and high availability.Production-ready features are delivered in the new architecture, showing measurable improvements in performance and efficiency.Standards and best practices for full-stack development, APIs, and interoperability are established and adopted.CI/CD pipelines, automated testing, and monitoring are in place to support reliable delivery.The engineering team is aligned to repeatable patterns for scalability and reliability.