Senior Engineering LeadCriticalRiver Inc. • Pleasanton, CA, United States

Senior Engineering Lead

CriticalRiver Inc. • Pleasanton, CA, United States

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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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Engineering Lead • Pleasanton, CA, United States

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