Job Summary: We are seeking an analytical and detail-oriented Senior PHP Developer to work on strategic projects, ensuring continuous system evolution and high technical quality of deliverables. Key Highlights: 1. Work on strategic projects with a focus on continuous system evolution 2. Ensure security and high technical quality in deliverables 3. Analytical, detail-oriented individual committed to best practices We are looking for a **Senior PHP Developer** to work on strategic projects, ensuring continuous evolution of internal systems, integration security, and high technical quality of deliverables. If you are analytical, detail-oriented, committed to best practices, and enjoy tackling complex challenges, this role is for you! Join Onset! **Responsibilities and Duties** * Develop and maintain native PHP applications running on IIS, integrated with SQL Server and other internal systems; * Implement, enhance, and support RESTful APIs and SOAP services, ensuring security, performance, and quality of internal integrations; * Analyze technical and business requirements, propose feasible solutions, and break them down into development tasks; * Model and optimize relational databases (SQL Server), including queries, stored procedures, and functions; * Ensure code quality by applying best practices, development standards, code reviews, and testing; * Collaborate with analysts, architects, and business units in specifying requirements and integrating systems; * Create and update technical documentation for services, integrations, routines, and developed components; * Perform production incident analysis and resolution, identifying root causes and proposing permanent improvements; **Requirements and Qualifications** **Knowledge:** * Solid experience in software development using PHP 7.4+ (native PHP) in production environments * Experience in relational database modeling, with focus on SQL Server * Experience with Agile methodologies (Scrum/Kanban) – principles, workflow management, and ceremonies * Experience developing and consuming RESTful APIs, including endpoint modeling, versioning, authentication/authorization, error handling, performance, and security best practices * Experience developing and consuming SOAP services, including contract definition (WSDL), legacy system integration, error handling, performance, and security best practices * Strong understanding of web development, including HTTP/HTTPS, cookies, sessions, CORS, best practices, privacy, and security. Specific Knowledge * Proficiency in PHP 7.4+ (native), object-oriented programming, array manipulation, sessions, error/exception handling, and best practices for code organization; * HTML5, CSS3, Bootstrap, and JavaScript at a level sufficient for maintaining and enhancing web interfaces; * Experience accessing SQL Server databases via; **Desirable** * Experience with version control using Git (branching, pull requests, code review); * Experience developing PHP applications running on IIS, including site and application pool configuration, FastCGI, URL Rewrite, permissions, logging, and troubleshooting;  **Differentiators:** * Experience in critical and complex system environments (high availability, large data volumes, multiple integrations); * Experience with Java for understanding, integrating, or maintaining legacy services; * Knowledge and experience using AI in the software development lifecycle (AI-assisted development tools such as Copilot, Cursor, ChatGPT, etc.); * Experience integrating AI into applications, such as AI agents, internal chatbots/assistants, automated document generation, and intelligent features supporting continuous application evolution; * Familiarity with AI-powered no-code/low-code platforms will be considered a plus; * Knowledge of Docker or other containerization tools for standardizing development environments; * Experience with React Native for developing mobile applications integrated with peripherals (biometric/fingerprint scanner, signature pad, etc.); * Experience with automated testing in PHP; **Additional Information** Hiring Type: PJ (Individual Contractor) Location: São José dos Campos Working Hours: Business hours, Monday to Friday On-site Availability: Occasional weekend, holiday, or *go-live* and *deployment* shift coverage required. We are an IT & Communications (Information Technology) services company capable of meeting all your company’s IT needs. We have specialized professionals in Technical Support, PMOaaS (Project Management as a Service), PMO (Project Management Office), System and Application Development, Risk Analysis, Infrastructure Monitoring, Cloud Computing Solutions, Network Management, Information Security, and LGPD compliance. OnSet has been operating in the Information Technology market since 1996, with a primary commitment to delivering IT services based on industry best practices (ITIL, SCRUM, AGILE, PMP), focused on value creation, optimization, and cost reduction. OnSet’s differentiated offerings help clients plan, implement, and operate their technology environments with maximum resource optimization, enhancing technology utilization and human talent development.