Job Summary: We are seeking a Senior/Mid-Senior Software Engineer focused on Backend and Infrastructure to maintain and operate critical production systems, prioritizing stability and performance. Key Highlights: 1. Key role in maintenance and operation of critical production systems 2. Focus on stability, performance, and operational continuity 3. Collaboration with the Lead Engineer A leading company in the industrial technology and software services sector, located in Chía, is looking for a Senior/Mid-Senior Software Engineer to join its engineering team. Role: Backend & Infrastructure Engineer responsible for maintaining and operating critical production systems. This is not a traditional web development role, but rather one focused on stability, performance, and operational continuity, working closely with the Lead Engineer. Key Responsibilities: • Maintenance and evolution of legacy systems in PHP 5.6. • Development and support of REST and SOAP APIs. • Management of RabbitMQ, WebSockets, and real-time systems. • Administration and optimization of MySQL under high load. • Integration with external services. • Linux infrastructure administration (Ubuntu Server, Apache, crons, services). • Fault diagnosis, recovery, and data integrity control. Requirements: • Proven production experience with PHP 5.x, Linux, Apache, RabbitMQ, and MySQL. • Solid knowledge of protocols (HTTP, SMTP, WebSockets, etc.). • Experience with concurrent and mission-critical systems. Ideal Profile: • 7+ years of professional experience. • Experience maintaining legacy systems. • Focus on stability and documentation—not on rewriting. • Ability to work under pressure with technical accountability. Conditions: Schedule and salary negotiable based on experience. Full statutory benefits Location: Chía . -Requirements- Minimum education: University Degree / Professional Program 2 years of experience Keywords: developer, programmer, db, bd, sql, db2, firebird, informix, interbase, oracle, postgresql, sqlserver