Staff Software Engineer

Segment (Twilio); Knockatee; On-site; EUR 120,000 - 180,000; Full time

Job summary

Twilio is hiring a Staff Software Engineer to join the Voice Connectivity Trust team. The role involves owning real‑time services in a distributed production environment, collaborating with Product Managers, architects and cross‑functional teams across the lifecycle from design to on‑call support.

You will design scalable, low‑latency systems, work with stakeholders to meet customer needs, and contribute to architectural decisions while mentoring peers and embracing AI tooling to enhance coding

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, operating systems, and distributed systems.
• Experience building RESTful services and API design; event‑driven architectures (Kafka, SQS).
• Hands‑on experience designing and driving CI/CD pipelines.
• Experience with on‑call rotations, incident response, monitoring/alerting tools (Prometheus, Datadog, Grafana).
• Hands‑on with cloud infrastructures such as AWS, GCP, OpenStack or Azure.
• Excellent written communication skills for technical documentation (with or without AI).
• 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.
• Familiarity with AI coding assistants (Claude, GitHub Copilot, Cursor) and workflows.
• Experience scaling data tiers with SQL/NoSQL databases and caching technologies.
• Experience scaling production backend systems; design and develop horizontally scalable, resilient systems.
• Strong team collaborator; capable of mentoring and driving architectural decisions.

Responsibilities

• Be an owner: Design and implement real‑time services with high throughput and low latency.
• Wear the customer's shoes: Understand needs and deliver simple, robust, scalable solutions.
• Write it down: Communicate clearly with leads, architects and cross‑functional teams.
• Be bold: Scale a complex distributed platform with global points of presence for availability and performance.
• Draw the owl: Solve customer problems for the Voice channel.

Skills

Distributed systems

Java

RESTful services

CI/CD pipelines

Cloud platforms

AI coding assistants

SQL/NoSQL

Education

Bachelor's degree in Computer Science or related engineering field

Tools

Kafka

SQS

Prometheus

Datadog

Grafana

AWS

GCP

OpenStack

Azure

GitHub Copilot

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. We use Artificial Intelligence (AI) to help make our hiring process efficient. That said, every hiring decision is made by real Twilions!

About the job

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

Required

• 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

Desired

• 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 may be required to travel occasionally to participate in project or team in‑person meetings.

What We Offer

Working at Twilio offers many benefits, including competitive pay, generous time off, ample parental and wellness leave, healthcare, a retirement savings program, and much more. Offerings vary by location. Twilio thinks big. We like to solve problems, take initiative, pitch in when needed, and are always up for trying new things. That's why we seek out colleagues who embody our values — something we call Twilio Magic. Additionally, we empower employees to build positive change in their communities by supporting their volunteering and donation efforts.

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. Qualified applicants with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. Additionally, Twilio participates in the E‑Verify program in certain locations, as required by law.