Senior Fullstack Engineer at Septeo

 How you'll have impact

● Architect a New Suite: You will be pivotal in building a brand-new product suite that spans multiple internal products and companies, tackling challenges in scalability, reusability (Monorepo), and multi-tenancy.

● Own the Full Vertical: You won’t just hand off APIs. You’ll design resilient backend services (Node.js/Kotlin) and consume them in rich, AI-native UIs (Next.js/React).

● Build AI-Native Experiences: From backend agents using LangChain to streaming generative UIs with the Vercel AI SDK, you will bring AI into the core of the user experience.

● Drive Engineering Excellence: Your input on architecture is expected. You’ll champion Domain-Driven Design (DDD), clean code, and performance optimization across the entire stack.

What you'll do

● Ship end-to-end features using TypeScript (Node.js/Next.js), while maintaining or integrating with services in Kotlin/Java. Craft modern frontends with React, Tailwind, and Vercel AI SDK, managing complex state with TanStack Query and Zustand.

● Engineer AI agents and workflows (LangChain, MCP) that integrate retrieval, memory, and tool use.

● Own your infrastructure: manage deployments using Terraform (IaC) on AWS/Kubernetes and handle Vercel configurations for the frontend.

● Obsess over quality: Maintain high confidence with Playwright (E2E) and Kotest/Jest/Vitest (Unit), and continuously tune performance (latency, Core Web Vitals).

● Leverage AI tooling (Copilot, Cursor, Claude) to accelerate development and share workflows with the team.

● 6+ years building production software.

● True Fullstack Fluency: Deep expertise in TypeScript (React/Node.js) is a must. Familiarity with Kotlin or Java is highly valued.

● Cloud Native: Proven experience running containerized workloads in AWS, Kubernetes, or serverless environments.

● Data Polyglot: Comfortable with both relational and NoSQL databases (MySQL, DynamoDB, Redis).

● Architectural Eye: You understand DDD and distributed systems patterns, not just syntax.

● Communication: You communicate clearly in Spanish / English and thrive on feedback loops.

Nice-to-have superpowers

● Experience scaling Monorepos (Turborepo, Nx).

● Hands-on with AI coding assistants or agent frameworks (LangChain, Autogen).

● Experience with GitOps or MLOps pipelines.

● Remote-first culture with flexible schedules and core hours.

● Goal-oriented work with an amazing, agile, cross-functional team.

● Learning budget and career plan.

● An international and diverse environment where you matter.