Staff Software Engineer

Twilio Inc.; Ireland; Remote; EUR 120,000 - 180,000; Full time

Job summary

Twilio Inc. is seeking a Staff Software Engineer to join the Voice Connectivity Trust team. You will own real-time services, design scalable distributed solutions, and collaborate with product managers, architects, and cross-functional teams in a distributed production environment.

The role emphasizes hands-on Java work, CI/CD optimization, on-call incident response, and leveraging AI tools to deliver value while ensuring security and performance.

Qualifications

• Minimum 8 years of hands-on experience in a large scale, distributed applications environment on JVM based technologies.
• Bachelor's degree in Computer Science or a related engineering field.
• Strong CS fundamentals including data structures, algorithms, OS and distributed systems.
• Experience building RESTful services, API design and event-driven architectures (Kafka, SQS).
• Hands-on experience designing and driving CI/CD pipelines.
• Experience with on-call rotations, incident response, monitoring/alerting (Prometheus, Datadog, Grafana).
• Hands-on experience with cloud infrastructures such as AWS, GCP, OpenStack or Azure.
• Excellent written communication skills for technical documentation (with/without AI).
• Proven ability to evaluate AI-generated code for correctness, security, performance, and maintainability.
• Hands-on Java experience with strong fundamentals and architectural review ability.
• Experience with AI coding assistants (Claude, Copilot, Cursor).
• Experience scaling data tiers with SQL/NoSQL and caching technologies.
• Experience scaling production backend systems for horizontal scalability.

Responsibilities

• Design and implement real-time services with high throughput and low latency.
• Work with stakeholders to understand customer needs and deliver robust, scalable solutions.
• Document thoughts and designs clearly for collaboration with leads and teams.
• Scale a distributed platform with global presence ensuring high availability and performance.
• Solve complex Voice channel problems with innovative approaches.

Skills

Java

Distributed systems

RESTful APIs

Kafka/SQS

CI/CD pipelines

Cloud platforms

On-call experience

AI tooling

SIP/Stir/Shaken

Education

Bachelor's degree in Computer Science

Tools

Prometheus

Datadog

Grafana

Kafka

SQS

AWS

GCP

Azure

Job description

Who we are

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.

Hiring and how we work

We use Artificial Intelligence (AI) to help make our hiring process efficient. That said, every hiring decision is made by real Twilions! Also, while we are a remote-first company, you may be asked to report in person on an ad-hoc basis for team gatherings, functional off-sites or customer meetings.

Twilio values diverse experiences from all kinds of industries, and we encourage everyone who meets the required qualifications to apply.

See yourself at Twilio

Join the team as Twilio’s next Staff Software Engineer.

About the job

This position is needed to add to our Voice Connectivity Trust team to enable Twilio to better support our customers using Voice in their solutions. As a Software Engineer on this team you will participate in all phases of the software development life cycle which includes requirements gathering with Product Managers, technical design, estimations, sprint planning, coding, testing, deployments and on-call support. This engineer will own, operate and maintain their teams’ services in a distributed production environment, employing agile methodologies to continuously deliver value to customers.

Responsibilities

• 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

Qualifications

• Minimum 8 years of hands-on experience in a large scale, distributed applications environment on JVM based technologies
• 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
• Experience building RESTful services, API design and event-driven architectures (Kafka, SQS)
• Hands-on experience designing and driving the optimization of CI/CD pipelines
• Experience with on-call rotations, incident response, monitoring/alerting tools (Prometheus, Datadog, Grafana)
• 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
• Hands-on Java experience with strong fundamentals, able to architect, review, and debug code whether it's yours, a teammate's, or an AI agent's
• Demonstrated proficiency working with AI coding assistants (Claude, GitHub Copilot, Cursor, or similar) - you should be able to describe your workflows and show examples
• 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
• Strong team collaborator who is both highly motivated and a motivating influence on peers
• Demonstrated technical leadership by driving architectural decisions, leading cross-functional technical initiatives, and actively mentoring team members
• Can demonstrate how you effectively use AI to deliver value efficiently
• 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…