About Kruzer We are a technology company that simplifies unified commerce. We deliver robust solutions in Order Management Systems (OMS), Product Information Management (PIM), and DevTools (iPaaS and API Management). We help major brands build omnichannel customer journeys, accelerate operations, and scale efficiently. We are seeking a Mid-Level Full-Stack Developer to strengthen our platform, ensuring its evolution with a focus on stability, performance, and quality, while also contributing to integrations and modern observability practices. **Responsibilities** * Maintain and continuously evolve platform applications, focusing on stability, quality, and predictability; * Analyze and resolve **incidents and requests**, delivering definitive solutions or validated workarounds, and documenting evidence and history in the ticket; * Implement **bug fixes and minor improvements** in backend services using **Node.js (Koa) / TypeScript**, adhering to team standards and best practices; * Support investigations into recurring issues by providing inputs for **Root Cause Analysis (RCA)** and preventive actions; * Work on integrations and asynchronous workflows (where applicable), supporting troubleshooting and reprocessing; * Query and optimize data routines in **MongoDB**, and manage caching using **Redis**; * Support log analysis and troubleshooting using **ElasticSearch/Kibana**, helping reduce diagnostic time; * Participate in code reviews, testing, and deployment routines to ensure technical quality and consistency; * Support execution/monitoring of changes during defined maintenance windows, when required. Hard Skills (Required) * Backend experience with **Node.js** and **TypeScript**. * Experience building and maintaining production REST APIs (error handling, response standards, basic observability). * Hands-on experience with **MongoDB** (basic modeling, queries, indexes, troubleshooting). * Practical knowledge of **Redis** (caching, TTL, basic cache invalidation). * Familiarity with **ElasticSearch/Kibana** (log search and analysis). * Experience with **Docker** (running services locally, health checks, basic troubleshooting). Nice-to-Have * Experience with **Koa** (or Express/Nest). * Knowledge of messaging/event systems (**Kafka**) and patterns such as retry/idempotency. * Experience with **React** for end-to-end troubleshooting. * Experience in environments with strict **SLA** requirements and critical operations (retail, payments, logistics). * Observability practices (log correlation, metrics, alerts, tracing). Soft Skills * Clear and concise communication. * Discipline in ticket management and deadline adherence. * Ability to collaborate effectively within a team. * Organization and transparency in support routines. * Proactivity in identifying improvements and preventing issues. What We Offer * Autonomy to lead and scale the company’s infrastructure. * Direct interaction with technical teams and high-impact projects. * A collaborative environment that fosters innovation and technical excellence. * Involvement in challenging projects with major retail and healthcare brands