Full Stack Developer

Description

**Senior Fullstack Developer (Next.js, NestJS, Python AI) \- AI\-First SaaS\nAbout the Project (Balder Jobs)** Tired of traditional, static, and inefficient job portals dominating the market? At **Balder Jobs**, we are redefining global recruitment through a cutting\-edge AI\-powered SaaS platform built on asynchronous microservices. We don’t build simple forms; we’re implementing advanced vector\-based semantic search (RAG with pgvector), bi\-directional live streams via WebSockets, task orchestration in asynchronous queues using RabbitMQ, a monetized click\-through (CPC) gateway integrated with Stripe, and automated candidate evaluations based on voice (Gemini Conversational API). We seek a versatile, passionate **Senior Fullstack Developer**, committed to clean architectures and impeccable code, to help take this revolutionary platform to the next level. **What challenges and responsibilities will you assume?** * **Modular and Scalable Development:** You will code following **Domain\-Driven Design (DDD)** tactical guidelines and patterns, ensuring absolute separation of responsibilities in our NestJS backend. * **AI Integration (FastAPI \+ RAG):** You will extend our AI microservice (ai\-service in Python) to process resumes and automate voice\-based conversational candidate evaluations (Speech\-to\-Text) using the Google Gemini SDK. * **Asynchronous Orchestration:** You will design and support audit workflows, reactive live chats, and background tasks using **RabbitMQ** as the asynchronous messaging broker. * **Hybrid Data Architecture:** You will maintain the transactional relational database (**PostgreSQL / Prisma**) optimized for conceptual vector searches, while polymorphically integrating **MongoDB / Mongoose** for logs, chat, and dynamic timelines. * **Premium User Experience:** You will implement rich, fluid interfaces in **Next.js**, focused on modern high\-fidelity aesthetics (glassmorphism, smooth animations, RSuite components, and SweetAlert2\). **Technical Requirements (What You Must Master)\n1\. Backend \& Microservices (Advanced Level):** * Absolute mastery of **TypeScript / Node.js** with the **NestJS** framework (REST APIs, WebSockets, modular architecture). * Solid experience applying **Domain\-Driven Design (DDD)** and tactical design patterns (SOLID, Repository Pattern). * Proficiency with **RabbitMQ** (AMQP) for asynchronous inter\-service messaging. **2\. Frontend (Aesthetics and Performance):** * Advanced experience with **React / Next.js** (App Router, TailwindCSS/PostCSS, Redux Toolkit). * Visual sensitivity: ability to create fluid, responsive, and visually stunning interfaces (micro\-animations, dark themes, modern CSS). **3\. Artificial Intelligence \& Python (AI\-Service):** * Mastery of **Python** and the **FastAPI** framework. * Experience integrating Large Language Model (LLM) APIs such as **Google Gemini** or OpenAI. * Knowledge of vector embeddings and RAG (Retrieval\-Augmented Generation). **4\. Databases \& DevOps:** * **PostgreSQL** with Prisma ORM (ideally familiar with extensions like pgvector for cosine similarity). * **MongoDB** with Mongoose ODM for document persistence. * Fluent use of **Docker and Docker Compose** for multi\-process local development environments. * Integration of payment gateways (**Stripe Webhooks** and Checkout). **Soft Skills:** * **Autonomy and Initiative:** Ability to self\-manage and propose robust, efficient architectural solutions. * **Attention to Detail:** Commitment to code quality (clean, English\-documented code) and end\-user visual experience. * **Communication:** Fluency in Spanish for business alignment and technical requirement synchronization. Salary: $9,469\.18 \- $26,019\.82 per month Benefits: * Free parking Workplace: On\-site employment