Senior Software Engineer

At Voxie, we believe conversation is the future. We've created the only SMS platform purpose-built for franchises, helping national brands drive local results across 15,000+ locations. Our AI-enhanced texting solution transforms how multi-unit businesses engage customers, drive sales, and stay compliant all with a few clicks. Role Overview The Senior Software Engineer builds and owns the integrations that connect Voxie's conversational platform to the systems our customers run their businesses on: CRMs, POS platforms, marketing tools, and messaging providers. This is a backend-focused role for an engineer who can take a rough integration requirement, ask the right questions, and ship a system that holds up at high message volume. You will scope work directly with our sales engineers and solutions engineers, with third-party platform teams, and at times with a customer's own technical staff. Strong communication matters here as much as strong code. What You'll Be Doing Integration Engineering Design, build, and maintain integrations with third-party platforms using REST APIs, webhooks, SFTP, and batch data pipelines. Turn ambiguous requirements into working systems: gather what you need from sales engineers, solutions engineers, and partner platform teams, then build it. Work directly with third-party providers and customers' engineering teams to scope, validate, and troubleshoot integrations. Handle high-throughput messaging workloads with careful attention to rate limits, retries, idempotency, and failure recovery. Software Development & Architecture Design, develop, and maintain high-quality, testable, scalable backend systems in PHP and TypeScript. Extend our distributed systems architecture for reliability, scalability, and cost efficiency. Use AI tools to accelerate delivery and automate processes end to end, so your time goes to high-value orchestration and reliability work. Write code that both humans and AI agents can understand, modify, and extend. Cloud & Infrastructure Build serverless and distributed solutions on AWS (Lambda, RDS, DynamoDB, SNS, SQS). Design systems for security, resilience, and operational efficiency. Contribute to infrastructure-as-code and CI/CD automation. Collaboration & Process Participate in Agile ceremonies and contribute to scoping and design discussions. Partner with Product, Sales, and Customer Success to deliver integrations that close deals and keep customers. Provide mentorship and code reviews that raise the team's engineering standard. Quality & Testing Build and maintain automated test suites with PHPUnit, Jest, and GitHub Actions. Hold the line on testing, code review, and monitoring. What We're Looking For Must Haves 5+ years of professional backend development experience with PHP (Laravel), TypeScript, or similar. Proven experience building and maintaining third-party integrations: REST APIs, webhooks, OAuth, SFTP, and batch data exchange. Experience with high-throughput or high-volume messaging systems. Solid understanding of distributed systems, API design, and database design. Working knowledge of AWS, particularly Lambda, RDS, DynamoDB, SQS, and SNS. Experience with automated test frameworks and CI/CD pipelines. Practical use of AI coding tools to ship faster, with the judgment to know where they help and where they don't. Strong communication skills: comfortable gathering requirements from non-engineers and speaking directly with customer technical teams. Our primary language is English, but we speak Portuguese, Spanish, Ukrainian, and French, so far! Preferred Experience at, or integrating deeply with, CPaaS platforms such as Twilio, Sinch, Vonage, or Bandwidth. Background in telecom or SMS infrastructure (10DLC, carrier compliance, deliverability). Cybersecurity experience. Serverless architecture experience. Enough frontend fluency (Vue.js, Tailwind) to build and maintain internal integration tooling and dashboards without waiting on another team.