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Senior Software Engineer at Sinch. Sinch is pioneering the way the world communicates. More than 150,000 businesses — including Google, Uber, Paypal, Visa, Tinder, and many others — rely on Sinch’s Customer Communications Cloud to power engaging customer experiences through mobile messaging, voice, and email. . Whether you need to verify users or craft omnichannel campaigns, Sinch makes it easy. Our AI-infused Super Network, APIs, and applications ensure you can connect with your customers reliably and securely, at every step of their journey. . At Sinch we “Dream Big”, “Win Together”, “Keep it simple”, and “Make it Happen”. These values are our foundation! . As a . Senior Software Engineer - (Java) - Gen AI. , you will play a key role in designing and building the next generation of our . AI-powered chatbot platform. . You will work in a dynamic, collaborative environment to develop scalable distributed systems that power real-time messaging and LLM-based applications. Your contributions will directly impact the efficiency, performance, and safety of AI-driven conversations at scale.. What You’ll Do. . Design, develop, and maintain backend services for . AI-driven chatbot orchestration. .. . Build . high-performance, scalable, and distributed systems. for real-time messaging and workflow execution.. . Work with . LLMs (Large Language Models). to enhance bot interactions, ensuring safety, efficiency, and responsiveness.. . Develop internal tools for . monitoring, debugging, and optimizing LLM-based applications. at scale.. . Implement and optimize . workflow orchestration. using frameworks like . Temporal.io. .. . Ensure . observability, reliability, and fault tolerance. across all services.. . Collaborate with cross-functional teams including . ML engineers, frontend engineers, and product managers. .. . Maintain a strong focus on . code quality, security, and best practices. in software development.. . This is a 95% remote role. You must be based in Spain and we will bring you to the office in Madrid for some days every quarter. . . What We Look For. . . Production-level experience. in backend development using . Java and Typescript. . . . Deep understanding of distributed systems. and experience building high-scale . microservices and event-driven architectures. .. . Strong background in . database design and optimization. , particularly with . MongoDB, Cassandra, or other distributed databases. .. . Experience with . observability, logging, and monitoring tools. for debugging and performance analysis.. . Familiarity with . cloud platforms. (AWS, GCP, or Azure) and containerized deployments (. Docker, Kubernetes. ).. . A . problem-solving mindset. with the ability to debug complex distributed systems.. . Strong communication skills and the ability to work effectively in a collaborative environment.. . Nice to Have. . Experience with . LLM fine-tuning or AI-driven chatbot development. .. . Knowledge of . message brokers like Kafka, RabbitMQ, . . . Hands-on experience with . Temporal.io. or similar workflow orchestration frameworks.. . Company Location: Spain.