Software Development Engineer

About the Position

We are looking for a Software Development Engineer to join our Voice Connectivity Trust team at Twilio. This role is pivotal in ensuring that Twilio's Voice customers have reliable voice communication with their customers. As a Software Engineer on this team, you will participate in all phases of the software development life cycle, from requirements gathering with Product Managers to on-call support.

Responsibilities

In this role, you’ll:

• Be an owner: Design and implement real-time services with high throughput and low latency requirements, verify, deploy, and operationalize them.
• Wear the customer's shoes: Work closely with stakeholders to understand customer needs and devise and deliver simple, robust, and scalable solutions.
• Write it down: Be comfortable expressing thoughts and ideas as detailed prose and use it as an effective means to collaborate with leads, architects, and cross-functional teams.
• Be bold: Embrace the challenge of scaling a complex distributed platform with points of presence globally, each one concerned with high availability, high reliability, high throughput, low latency, and media fidelity.
• Draw the owl: Figure out novel ways of solving customer problems for the Voice channel.

Requirements

Required:

• Minimum 2+ years of hands-on experience in a large-scale, distributed applications environment on JVM-based technologies.
• Experience building RESTful services, API design, and event-driven architectures (Kafka, SQS).
• Understanding of CI/CD pipelines.
• Hands-on experience with cloud infrastructures such as AWS, GCP, OpenStack, or Azure.
• Excellent written communication skills - essential for effective AI prompting and for creating clear technical documentation (with or without AI assistance).
• Proven ability to critically evaluate AI-generated code for correctness, security, performance, and maintainability.
• Strong Java fundamentals with the ability to architect, review, and debug code whether written by you, teammates, or AI agents.
• Demonstrated proficiency working with AI coding assistants (Claude, GitHub Copilot, Cursor, or similar) - you should be able to describe your workflows and show examples.
• Bachelor's degree in Computer Science or a related engineering field.
• Strong Computer Science fundamentals not limited to data structures, algorithms, operating systems, and distributed systems.
• Able to work well in a team setting and both highly motivated and motivating.

Desired:

• Experience with on-call rotations, incident response, monitoring/alerting tools (Prometheus, Datadog, Grafana).
• Can demonstrate how you effectively use AI to deliver value efficiently.
• Experience scaling data tiers employing a variety of SQL/NoSQL database and caching technologies.
• Hands-on experience scaling production backend systems, with the proven ability to design and develop horizontally-scalable, resilient, and performing-under-load systems.
• Knowledge and experience working with SIP protocol.
• Knowledge and experience working with Stir/Shaken protocol.

Location

This role will be remote, and based in Ireland.

Travel

We prioritize connection and opportunities to build relationships with our customers and each other. For this role, you may be required to travel occasionally to participate in project or team in-person meetings.

We Offer

There are many benefits to working at Twilio, including, in addition to competitive pay, things like generous time-off, ample parental and wellness leave, healthcare, a retirement savings program, and much more. Offerings vary by location.

About the Company

At Twilio, we’re shaping the future of communications, all from the comfort of our homes. We deliver innovative solutions to hundreds of thousands of businesses and empower millions of developers worldwide to craft personalized customer experiences.

Our dedication to remote-first work, and strong culture of connection and global inclusion means that no matter your location, you’re part of a vibrant team with diverse experiences making a global impact each day. As we continue to revolutionize how the world interacts, we’re acquiring new skills and experiences that make work feel truly rewarding. Your career at Twilio is in your hands.

Twilio is proud to be an equal opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, reproductive health decisions, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, political views or activity, or other applicable legally protected characteristics. We also consider qualified applicants with criminal histories, consistent with applicable federal, state, and local law.

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