The Role: The Senior Full-Stack Developer owns delivery of roadmap features set by our executives. Working hands-on under the guidance of the technical cofounder and alongside a small team of senior engineers, this person will architect, build, and operate cloud-native services without day-to-day micromanagement. Design, develop, and maintain scalable microservices and web applications using C#/.NET Core Architect, deploy, and optimize workloads on AWS (EC2, ECS Fargate, Lambda, RDS, DynamoDB, S3, CloudFormation or AWS CDK) Drive all phases of the software lifecycle: technical design, implementation, testing, monitoring, and continuous improvement Participate in peer code reviews and help uphold high engineering standards Identify and implement platform improvements that enhance performance, reliability, security, and developer experience Collaborate with Product, Support, and QA to release customer-facing features and resolve production issues promptly Required Qualifications: 8+ years of professional software development, including 5+ years with C#/.NET Core or later Front End: JavaScript, Typescript, HTML, CSS are foundational.





React knowledge would be a bonus but not required. Demonstrated success building and operating full-stack applications on AWS Strong knowledge of relational and NoSQL data modeling Proven ability to work autonomously, take accountability for outcomes, and deliver high-quality solutions Excellent written and verbal communication skills with a bias for action and clarity Bonus Qualifications (VoIP & Real-Time Communications): Asterisk or FreeSWITCH SIP, RTP, and media negotiation Kamailio or OpenSIPS WebRTC data or media channels Experience designing, scaling, and troubleshooting VoIP workloads on AWS, including NAT traversal and integral media routing Familiarity with audio codecs, QoS, and diagnostic tools such as sngrep and Wireshark Working Practices & Culture: the developer chooses the best execution approach Continuous delivery – small, frequent deployments supported by automated tests and infrastructure as code Ownership mindset – every engineer can improve the product, codebase, and processes

📌 Senior Full-Stack Developer (JavaScript, C# + AWS) (Santa Cruz de Rosales)
🏢 Nir-yu
📍 Santa Cruz de Rosales