Staff Engineer, Site Reliability Engineer (SRE)

Founded in 2014, Circles is a global technology company reimagining the telco industry with its innovative SaaS platform, empowering telco operators worldwide to effortlessly launch innovative digital brands or refresh existing ones, accelerating their transformation into techcos.

Today, Circles partners with leading telco operators across multiple countries and continents, including KDDI Corporation, Etisalat Group (e&), AT&T, and Telkomsel, creating blueprints for future telco and digital experiences enjoyed by millions of consumers globally.

Besides its SaaS business, Circles operates three other distinct businesses:

• Circles.Life: A wholly-owned digital lifestyle telco brand based in Singapore, Circles.Life is powered by Circles’ SaaS platform and pioneering go-to-market strategies. It is the digital market leader in Singapore and has won numerous awards for marketing, customer service, and innovative product offerings beyond connectivity.

• Circles Aspire: A global provider of Communications Platform-as-a-Service (CPaaS) solutions. Its cloud-based Experience Cloud platform enables enterprises, service providers and developers to deliver and scale mobile, messaging, IoT, and connectivity services worldwide.

• Jetpac: Specializing in travel tech solutions, Jetpac provides seamless eSIM roaming for over 200 destinations and innovative travel lifestyle products, redefining connectivity for digital travelers. Jetpac was awarded Travel eSIM of the Year.

Circles is backed by renowned global investors, including Peak XV Partners (formerly Sequoia), Warburg Pincus, Founders Fund, and EDBI (the investment arm of the Singapore Economic Development Board), with a track record of backing industry challengers.

Job Title - Staff Software Engineer - Network

Location -Srilanka

About the Role

We are seeking a Staff Network Engineer (10+ Years Experience) to join our infrastructure team. This pivotal role requires a seasoned professional who functions as both a hands-on technical expert and a strategic mentor. You will be responsible for the end-to-end implementation of complex network designs, translating architectural blueprints into resilient, high-performance production environments.

The ideal candidate possesses an unwavering drive for operational excellence and a meticulous eye for detail. You will bridge the gap between high-level architecture and physical/virtual deployment, ensuring our global footprint—spanning multiple public clouds and private data centers—is secure, scalable, and highly observable.

Key Responsibilities

• VPC & Connectivity: Design and deploy sophisticated Virtual Private Cloud (VPC) networks across AWS, GCP, and OCI, ensuring seamless integration via Direct Connect and Interconnect services.

• Private Cloud Mastery: Manage and scale software-defined networking within VMware Private Cloud and OpenStack environments.

• Architecture Realization: Take ownership of complex network designs provided by the Architecture team, transforming theoretical requirements into functional, robust infrastructure.

• L4–L7 Firewall Management: Oversee the configuration and maintenance of advanced firewalls, focusing on deep packet inspection, application-level security, and complex policy enforcement.

• Virtual Load Balancing: Implement and optimize virtual Load Balancers (LB) to ensure high availability and efficient traffic distribution across global services.

• Core Switching: Provide expert-level management of L3 switches, including VLAN tagging, routing protocols (BGP, OSPF), and hardware optimization.

• Linux Integration: Leverage a deep Linux background to manage network services, automate tasks, and troubleshoot at the OS level.

• Full-Stack Monitoring: Establish comprehensive Observability and Monitoring frameworks to track latency, throughput, and error rates, ensuring proactive issue resolution before business impact.

• Technical Mentorship: Guide and mentor mid-level engineers, fostering a culture of technical excellence and continuous learning.

• Capacity Planning: Manage resource allocation and team capacity to meet aggressive project timelines and business objectives.

• Strategic Collaboration: Work closely with senior leadership and cross-functional teams to provide expert guidance on network feasibility and security posture.

Qualifications 

• Paper qualifications: Bachelor’s degree in Computer Science, Software Engineering, or a closely related discipline.

• Experience: 10+ years in Network Engineering/ Systems Engineering with a proven track record in enterprise-scale environments.

• Cloud Proficiency: Hands-on experience with AWS Direct Connect, GCP Cloud Interconnect, and OCI FastConnect

• Technical Stack: Expert knowledge of L4+ Firewalls, L3 Switching, and Linux-based networking tools for automations.

• Precision: Exceptional analytical prowess with a "measure twice, cut once" approach to infrastructure changes.

• Outstanding communication skills and the ability to excel in a client-facing environment.

Circles is committed to a diverse and inclusive workplace. We are an equal opportunity employer and do not discriminate on the basis of race, national origin, gender, disability or age.

By submitting an application for this position, you, as the applicant, or your authorised representative(s), consent to Circles’ Candidate Data Protection and Privacy Policy. You also agree to the collection, use, and/or disclosure of your personal data by us solely for recruitment purposes as specified in the Policy. You acknowledge that you have read and understood the Policy, are aware of your rights regarding your personal data, and accept the terms relating to international data transfers, where applicable. You further understand that you may withdraw consent at any time, which may affect our ability to consider your application. In instances where your personal data or application is submitted by a third party, it is understood that such third party has been duly authorised by you to disclose the relevant personal data and provide consent on your behalf, and that you have been made aware of this Policy.

To all recruitment agencies: Circles will only acknowledge resumes shared by recruitment agencies if selected in our preferred supplier partnership program.

Please do not forward resumes to our jobs alias, Circles, employees or any other company location. Circles will not be held accountable for any fees related to unsolicited resumes not uploaded via our ATS.