We are looking for an **Advanced Node.js SSR Developer** with experience in payments, acquiring, and real-time transaction processing. Your mission will be to design and maintain critical core business services, ensuring **high performance, resilience, security, and scalability**. This is a key role within a highly transactional environment, focused on real-time, high-volume solutions. **Responsibilities** * Design, develop, and maintain backend services in **Node.js**, oriented toward transaction processing. * Implement **high-availability and low-latency** solutions. * Work with technologies and standards from the payments ecosystem (acquiring, financial messaging, ISO 8583, VISA/MASTER integrations). * Build microservices and modern integration patterns. * Integrate and operate services on **AWS** (Lambda, ECS, SQS, DynamoDB, among others). * Ensure scalability and resilience of core systems. * Collaborate with architecture, product, and QA teams in agile environments. **Required Qualifications (Mandatory)** * 3–4+ years of solid experience in **Node.js**. * Experience developing **high-availability** and **low-latency** systems. * Concrete experience in one or more of the following areas: * Acquiring processors * Payment gateways * POS / e-commerce / QR * ISO 8583 * Integrations with VISA / MasterCard * Experience with **AWS**: Lambda, ECS, SQS, DynamoDB, etc. * Experience with **microservices** and integration patterns. **Desired Qualifications** * General knowledge of the fintech ecosystem. * Experience in high-volume transactional systems. * Familiarity with event-driven architectures. **Work Modality** * **Remote (Argentina)** * Availability for virtual meetings and coordination with distributed teams. **Ideal Candidate Profile** * Autonomous, solution-oriented, and performance-driven. * Ability to work under pressure in systems where availability is critical. * **Strong communication skills and collaborative mindset.** Employment Type: Full-time, Permanent Salary: $3,500,000.00 – $4,000,000.00 per month Application Questions: * We are seeking an SSR or Advanced SSR developer — how many years of experience do you have developing in Node.js? * Have you worked on high-availability or low-latency systems? Briefly describe. * Do you have experience in acquiring, payments, or integrations with networks such as VISA/MasterCard? * Have you worked with ISO 8583? (Yes/No – describe if applicable). * Do you have AWS experience? Which services have you used? * Have you worked with microservices and modern integration patterns? * Do you agree with the offered salary range based on your experience, or do you have a different salary expectation? Experience: * Node.js: 4 years (Mandatory) Work Location: Remote employment