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 Summary

We are seeking a Principal Full-Stack Engineer to lead the re-architecture of our PHP-based SaaS application into a modern, scalable, and robust 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 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 SSR/SSG) and backend APIs ) 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 & Delivery

• Lead 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 Bring

• 8+ years of full-stack engineering experience, with 5+ years in SaaS development.
• Proven expertise in (SSR, SSG, API routes) and (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 Criteria

• Current system gaps in scalability, performance, and reliability are analyzed and documented, with a clear migration plan defined.
• A modern 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.