Desenvolvedor(a) Back-end Especialista

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Desenvolvedor(a) Back-end Especialista based in Brazil. This is a senior technical leadership opportunity focused on the stability, resilience, and continuous evolution of a high-volume SaaS platform. You will act as a key technical reference for backend operations, supporting complex production incidents and driving improvements that reduce downtime and MTTR. The role combines hands-on development with architecture modernization, automation, observability, and operational excellence. You will work closely with development, SRE, product, and customer operations teams to solve complex technical challenges. A major focus will be reducing technical debt and operational toil while improving platform performance and reliability. You will also mentor engineers, establish engineering standards, and help shape scalable solutions in a collaborative and fast-moving environment. Act as a senior technical reference for backend development, platform stability, and technical decision-making. Serve as the final technical escalation level (N3) for complex incidents involving SaaS applications, messaging systems, and communication platforms. Investigate, diagnose, and resolve complex production issues with a strong focus on reducing MTTR and improving service availability. Maintain and evolve high-throughput, low-latency messaging and communication systems with a focus on resilience, scalability, and performance. Identify technical debt and legacy components, leading refactoring and modernization initiatives while maintaining business continuity. Automate repetitive operational activities and reduce engineering toil through tooling, process improvements, and automation. Develop and maintain detailed runbooks, technical documentation, and internal knowledge bases to increase operational autonomy. Mentor N1 and N2 teams through technical training, knowledge sharing, and Tech Talks, reducing unnecessary escalations. Establish and promote engineering best practices around software design, automated testing, code reviews, maintainability, and reliability. Collaborate with SRE and product teams to translate business requirements into scalable, sustainable, and technically robust software solutions. Contribute to the modernization of backend architecture and the adoption of contemporary technologies and development practices. Lead selected technical initiatives and facilitate decision-making across teams in a dynamic environment. Requirements: Solid experience supporting, maintaining, and evolving SaaS products in production environments. Strong expertise in Node.js, including deep understanding of the Event Loop, memory management, debugging, and performance optimization. Extensive experience with NestJS for new development, as well as maintaining and evolving applications built with Express and Koa. Advanced TypeScript knowledge, including strong typing, object-oriented and functional programming practices, and maintainable code design. Practical experience designing, implementing, and supporting event-driven and asynchronous architectures using technologies such as Apache Kafka and AWS SQS. Strong experience with MongoDB, including data modeling, aggregation, and query optimization. Experience with application observability and DevOps practices, including OpenTelemetry, Datadog, or similar platforms for metrics, logging, and distributed tracing. Familiarity with CI/CD pipelines and modern software delivery practices. Previous experience providing technical leadership, facilitating engineering decisions, resolving conflicts, and influencing teams in dynamic environments. Strong analytical and troubleshooting skills, with a structured approach to diagnosing complex production problems. Excellent communication and collaboration skills, with the ability to work effectively across development, SRE, product, and operations te