[Remote] Senior Full Stack Engineer (BE focused0

Note: The job is a remote job and is open to candidates in USA. Avenue Code is a consultancy company seeking a Senior Full Stack Engineer with a focus on back-end development. This role involves designing and building scalable back-end APIs, managing database architectures, and contributing to full-stack integrations while mentoring junior engineers.

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

Skills

• Back-End Framework & Messaging: NestJS on Node.js / Express, REST + OpenAPI/Swagger (Scalar), Kafka, Typescript
• Data & Storage: MongoDB + Mongoose (migrations via ts-migrate-mongoose), AWS S3
• Auth & Integrations: NextAuth, JWT, Stripe, Persona
• Build / Infra / DevOps: Docker & docker-compose, GitHub Actions, AWS
• Core Front-End: React, Next.js (App Router), TypeScript
• Client State & Data: TanStack React Query, Zustand, Immer
• Styling: Tailwind CSS, Emotion, CSS Modules, PostCSS
• Observability: PostHog, Winston
• I18n: next-intl, i18next / react-i18next, Ditto
• Testing: API: Vitest, Supertest, mongodb-memory-server
• Web: Jest, React Testing Library, Storybook
• Code Quality: ESLint 9, Prettier, Husky, lint-staged, Knip, Code Coverage

Company Overview

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