Senior Full Stack Engineering Lead

2 weeks ago


Pleasanton, United States CriticalRiver Inc. Full time

Title: Senior Engineering Lead (Full-Stack, Enterprise SaaS Systems)Location: Pleasanton, California (hybrid work, 2-3 days per week onsite)Job type: Fulltime/Contract Role Overview:This is a senior individual contributor role requiring 12+ years of software engineering experience, with at least 10+ years building enterprise-grade, B2B SaaS applications. As a Senior Engineering Lead, you will own end-to-end architecture, design, and implementation of complex systems across frontend, backend, APIs, microservices, and data pipelines.You’ll drive technical execution through hands-on contributions, applying AI-assisted developer workflows to accelerate delivery and quality. You will serve as a technical authority, collaborating closely with peers and stakeholders, while ensuring that our platform is scalable, performant, secure, and reliable.Core Responsibilities:Architect and scale enterprise systems: Design across frontend, backend, APIs, microservices, and data pipelines, aligned to SaaS reliability and security standards.Hands-on development: Write production-quality code, conduct architecture reviews, lead complex refactors, and contribute to critical development cycles.Rapid feature delivery: Ship robust features at speed using modern development practices and AI-assisted workflows.AI-accelerated engineering: Leverage tools such as Copilot, Cursor, Replit, Claude/other agents, PromptPex for coding, refactoring, and testing.Spike-first prototyping: Validate new feature ideas through quick prototypes and experiments before full implementation.Cloud-native integration: Build services and infrastructure for LLMs, RAG pipelines, vector databases, and AI agent workflows.Technical documentation: Produce high-quality design docs, specs, and internal technical narratives.Cross-functional collaboration: Work with Product, UX, Analytics, and Security to align technical solutions with business needs.System reliability: Define SLOs/SLIs, enhance observability, and ensure services meet performance and availability targets.Required Qualifications:12+ years in software engineering, with a focus on enterprise B2B SaaS systems.10+ years of hands-on development building scalable, reliable, modular SaaS products.Proficiency in frontend and backend engineering (React/TypeScript, Node.js/Python, SQL/NoSQL).Strong experience with system design, distributed systems, and cloud infrastructure (AWS, GCP, or Azure).Familiarity with microservices, containerization, Kubernetes, CI/CD pipelines, and observability tooling.Demonstrated ability to ship complex features under tight deadlines in high-growth or startup environments.Experience integrating AI-assisted developer tools into workflows.



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