Sr Javascript Developer

Sonatafy Technology, the exceptional nearshore software development and staff augmentation company, is partnering with a rapidly expanding startup. We're on the hunt for a talented Senior Backend Engineer to join their crew and contribute to their, dare we say, groundbreaking platform. If you're tired of the same old code and crave a place where your ideas actually matter, this might be your gig.

You'll be embedded within our client's team, a dynamic company experiencing hypergrowth. You'll be a key player in developing their core applications, working alongside and leading a team of engineers who are passionate about their work. This is a chance to make a real impact, shape the technical direction, and be part of a company that's disrupting its industry.

• Lead and mentor a team of engineers, fostering a collaborative and high-performing environment.
• Propose and implement scalable architectural patterns to support the application's growth and ensure long-term maintainability.
• Define and enforce coding standards, best practices, and architectural guidelines.
• Follow and contribute to existing software design patterns.
• Identify and resolve data/process bottlenecks.
• Maintain and update the codebase.
• Collaborate with the Frontend team to ensure new features are performant and meet design requirements.
• Conduct code reviews and provide constructive feedback.
• Troubleshoot and resolve complex technical issues.

• Proven experience working on high-throughput, high-availability applications, with experience in a lead role.
• 8+ years of professional backend engineering experience.
• 5+ years of experience with NodeJS.
• 6+ years of experience with MongoDB (specifically with Indexes, Aggregation Pipelines, Replica Sets, and Sharding).
• Strong systems operations experience with AWS services (EC2, ECS, S3, Lambda, Rekognition, Elasticache, AmazonMQ, Cloud Watch).
• Experience with Docker and container orchestration.
• Demonstrated experience with DNS, VPNs, Networking, Firewalls, static asset delivery, application load balancing, and auto-scaling.
• (Preferred) Experience working with AI.
• Strong understanding of web design best practices, standards, and modern web application development trends.
• Excellent communication and leadership skills, with the ability to mentor and guide team members.
• Proven ability to make sound technical decisions and drive projects to completion.
• Experience in technical planning and roadmap development.

At Sonatafy, you'll join a community of highly skilled engineers across Latin America supporting innovative U.S.

-based teams. You’ll be part of a fast-moving, client-first culture where your code has real-world impact. We offer competitive compensation, a remote-first lifestyle, and career growth opportunities across industries and technologies.