Senior Full Stack Engineer (BE focused)

Avenue Code; Mountain View (CA); On-site; USD 155,000 - 157,000; Full time

Job summary

Avenue Code is looking for a Senior Back-End Engineer to join their team in Mountain View, CA. This role focuses on building and scaling front-end APIs with a strong emphasis on back-end performance and data architecture. You'll also contribute to front-end development using React and mentor junior engineers, ensuring high software quality and scalability.

The ideal candidate has expertise in Node.js and TypeScript, strong problem-solving skills, and is passionate about engineering culture and code quality.

Qualifications

• Ability to comfortably read, write, review, and debug code.

Responsibilities

• Design and build robust, efficient back-end APIs.
• Own database schemas and storage strategies.
• Lead code reviews and mentor junior engineers.
• Write comprehensive unit and integration tests.

Skills

Node.js and TypeScript expertise

Strong React proficiency

Strong problem-solving skills

High standards for software quality and maintainability

Job description

About The Opportunity

We are building something brand new — and this role is foundational to the quality, performance, and scalability of what we ship. We need someone who takes genuine pride in the craft of back‑end engineering: an engineer who sees system architecture, data modeling, API design, and performance not as hidden infrastructure, but as the core engine of the product. This is an immediate hire. This is a full‑stack role with a back‑end focus. The primary ownership is the server‑side architecture and data layer, but this engineer is expected to contribute across the stack — building UI components, understanding client‑side state, and making informed architectural decisions end to end. This person will be one of the most senior engineers on the team, with real ownership over how our systems are built, scaled, and integrated across the platform. This role is on site in Mountain View, CA.

Responsibilities

• System Architecture & API Development — Designing, building, and scaling robust, efficient back‑end APIs that power our front‑end, with a strong sense of what makes an API clean, secure, and performant.
• Data & Storage — Owning database schemas, querying patterns, and storage strategies; understanding how data architecture decisions directly affect the product experience and system scalability.
• Full‑Stack Integration — Owning the full request lifecycle, from data persistence and messaging layers up to the API and UI interaction.
• Back‑End Performance & Security — Implementing caching strategies, optimizing database queries, managing asynchronous events/messaging, and ensuring robust authentication/authorization.
• Front‑End Contribution — Writing clean, maintainable code within our React/Next.js ecosystem to consume APIs and deliver cohesive user experiences.
• Test Coverage — Writing comprehensive unit, integration, and functional tests (focusing heavily on API and database reliability) that keep the codebase stable as it scales.
• Engineering Culture — Leading code reviews, mentoring junior and mid‑level engineers, and helping define the engineering standards we hold ourselves to.

Engineering Collaboration

• Front‑End Engineering Teams — Aligning early on API contracts, data hydration patterns, and service boundaries to ensure the client‑side has the performant, logical endpoints it needs.
• Product & Design — Helping shape what’s technically feasible, flagging trade‑offs and edge cases early, and translating product requirements into scalable system designs.
• Data/Infra Teams — Collaborating on shared back‑end decisions, infrastructure deployment, and event‑driven messaging architectures.

Required Qualifications

• Node.js and TypeScript expertise
• Strong React proficiency
• Ability to comfortably read, write, review, and debug code
• Strong problem‑solving skills
• High standards for software quality and maintainability

Nice To Have Skills

• Experience with animations, CSS motion, or Framer Motion is a nice‑to‑have.
• Strong React experience remains important.

Salary Range: $155,000–$157,000 per year.