Sr. Software Engineer (Mexico/Remote)

Job Summary: We're hiring back-end engineers for our Platform team. Platform builds the shared services every Neumo application consumes: reporting, payments, search, authentication, messaging, file handling, and more. Our guiding principle is build once, use everywhere. When three products need the same capability, Platform owns it. This is not single-product work. You'll design services that have to be reliable, secure, and multi-tenant from day one, because they're used by many applications at once. On any given day you might architect a new service, refactor an existing one to scale, instrument it for production, or pair with a product team to turn their requirements into a clean platform API. Duties and Responsibilities: Architect, build, and operate shared back-end services in Node.js that are consumed across Neumo's product portfolio. Design for multi-tenancy from the start: tenant isolation, data separation, and per-tenant configuration are core to everything we build. Build event-driven, serverless systems on AWS (Lambda, EventBridge, SQS/SNS, S3, RDS, Redshift). Own your services in production: monitoring, tracing, alerting, and incident response, not just the first deploy. Write and maintain automated tests across unit, integration, and regression layers, and keep coverage high. Treat security as part of the definition of done: dependency and vulnerability remediation, secrets management, and compliance on sensitive paths like payments. Use AI coding tools (Claude Code, Cursor) as part of your daily workflow, and review AI-generated code with the same rigor you'd apply to your own. Participate in design reviews and code reviews, and share what you learn so the whole team levels up. Partner with product and design to translate end-user requirements into pragmatic, scalable technical solutions. Perform other duties as assigned. Education and Experience: Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience. 4+ years of back-end engineering experience, including production-grade, scalable systems in Node.js. Strong experience designing and building RESTful APIs and microservices. Solid experience with relational databases (we use PostgreSQL). Hands-on experience with cloud infrastructure, ideally AWS, and comfort with serverless and event-driven patterns. Experience with automated testing and a real commitment to code quality. Experience building multi-tenant SaaS platforms. Experience with AWS serverless specifically (Lambda, EventBridge, Cognito, OpenSearch) and infrastructure as code (SAM, CloudFormation, or similar). Experience with message-based and event-driven architectures. Experience integrating or building payments systems, and familiarity with PCI compliance. Experience working with AI-assisted development tools in a production codebase. Knowledge, Skills and Abilities: Excellent written and verbal communication. Much of our team is distributed, so clear async communication matters. Highly motivated, self-guiding, and a constant learner who still loves contributing to team design and discussion. Must possess excellent organizational and communication skills. Willingness to take on new challenges. Must be reliable and responsible with a high attention to detail and accuracy. Work Environment : Office setting with a moderate noise level. The employee will work at an individual workstation, using a telephone and computer. Physical Demands : Must be able to remain seated for extended periods. Regular use of a computer and other office machinery, such as printers and copy machines. Occasional movement around the office. Frequent communication via telephone. Neumo Summary: With the backing of four decades of public sector expertise and corporate capability, Neumo has successfully supported government services. Neumo was honored and recognized for four (4) consecutive years as a GovTech 100 Company representing the top 100 companies focused on making a difference in and selling to state and local government agencies across the United States. Neumo is committed to helping communities thrive and brings a wealth of experience combined with innovation. Today, Neumo offers more administrative and financial support to government officials than any other organization. And with a responsive, client-focused approach, we foster partnerships that give our customers the certainty they need to accomplish more. Neumo offers a competitive benefits and compensation package and are looking for team members who will thrive in our dynamic environment. Neumo is an Equal Opportunity Employer. Selection for a position will be made without regard to race, religion, national origin, sex, political affiliation, marital status, non-disqualifying physical handicap, and age.