Full-Stack Engineer

Sonar•Austin, TX

About The Position

As a Senior Full-Stack Engineer for internal applications, you will be the engineering owner of custom solutions and integrations that connect our core business platforms (e.g., Salesforce, Stripe, NetSuite, licensing systems, etc.). You will be responsible for the entire lifecycle of these solutions—from architecture and design to implementation, deployment, monitoring, and continuous improvement. Your work (reliable, scalable, performant and secure applications) and skills (ability to translate complex business needs, coupled with a strong sense of ownership, urgency and partnership) will make you a trusted partner who drives significant efficiency and process improvements for the company.

Requirements

5+ years (tbc) as a Full-Stack Engineer building business‑critical applications and integrations.
Strong proficiency in at least one modern back‑end technologies (e.g. TypeScript, NodeJS), in AWS environments.
Proven experience designing and implementing integrations between SaaS systems (e.g., CRM, billing, payments, licensing, ERP) with robust error handling and observability.
Solid understanding of software architecture and design principles, including how to design for scalability, maintainability, and operational robustness over time.
Demonstrated ability to build secure and compliant solutions, with an understanding of data protection concepts (e.g., GDPR) and secure coding practices.
Hands‑on experience with CI/CD, automated testing, and modern SDLC practices (e.g., Git-based workflows, code reviews, trunk‑based or similar).
Familiarity with monitoring, logging, and incident management for production services.

Responsibilities

Own the end-to-end lifecycle of internal software applications and integrations: architecture, coding, testing, deployment, and maintenance.
Translate business requirements into robust, scalable technical designs, including data models, APIs, system architecture, and UI flows where relevant.
Implement full-stack features: write clean, efficient, and maintainable code for both back-end and front-end components; design and manage persistence layers; integrate with third‑party APIs (e.g., Salesforce, Stripe) and internal services.
Build security & compliance into the design, incorporating data protection and regulatory requirements (e.g., GDPR) from the start, and collaborating with IST, ITOps, and Legal to ensure adherence to standards.
Collaborate with business stakeholders (e.g., Finance, Sales, HR, Business Technology colleagues) to clarify requirements, challenge assumptions, and co‑design pragmatic, value‑driven solutions.
Support and guide User Acceptance Testing (UAT): provide technical support during UAT, address defects quickly, and ensure the delivered solution truly solves the underlying business problem.
Communicate clearly on feasibility, trade‑offs, and timelines, serving as the technical point of contact and managing scope to protect solution integrity and production stability.
Implement and operate CI/CD pipelines to achieve reliable, frequent releases with a low change‑failure rate.
Write and maintain unit, integration, and end‑to‑end tests to ensure high software quality and reduce regressions.
Provide ongoing production support for the applications you own, including bug fixes, performance tuning, refactoring to address technical debt, and planned feature evolution based on user feedback and strategy.
Document architecture and decisions clearly (e.g., in Confluence/Xtranet and Atlas), so the broader team can understand, operate, and extend your work.
Implement comprehensive monitoring and alerting for all owned applications, with meaningful KPIs and dashboards that surface issues before they become incidents.
Serve as the primary on‑call engineer (as part of a rotation) for your applications, leading incident investigation and coordinating with other teams when issues occur.
Run blameless post‑mortems after critical incidents, identify root causes, and define action items that meaningfully reduce recurrence.