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.

Key Responsibilities:

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):

Hands-on experience with one or more of the following:
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 general media routing

Familiarity with audio codecs, QoS, and diagnostic tools such as sngrep and Wireshark

Working Practices & Culture:

Time-zone overlap – minimum of three overlapping hours with teammates in Europe or US Eastern time for real-time collaboration

Autonomy with guidance – goals are set with the technical cofounder and CEO; 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) (Cuajimalpa de Morelos)
🏢 Nir-yu
📍 Cuajimalpa de Morelos