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.