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.
Role: Principal Engineer, Middleware Architecture & Integrations
Standardized Job Title: Principal Engineer, SRE Architecture
About this role
Design, implement, and maintain highly available, scalable, and resilient middleware infrastructure — spanning messaging, caching, and integration layers — across AWS, GCP, and OCI as the primary platforms.
Provide technical leadership and architectural expertise in middleware and integration engineering — covering event-driven architecture, message brokers, caching strategies, and API management frameworks.
Lead middleware automation initiatives using Terraform, Ansible, and Python to drive zero-touch provisioning and configuration management across multi-cloud environments.
Define and enforce SLOs, SLIs, and Error Budgets for middleware and integration services, ensuring throughput, latency, and reliability targets are met without compromising velocity.
Architect and operate Kafka, RabbitMQ, and Redis platforms with a focus on scalability, cost optimisation, and fault tolerance.
Own the API Gateway and integration strategy — designing secure, scalable, and well-governed APIs and event pipelines across internal and external systems.
Collaborate with development and platform teams to embed reliability, security, and performance standards into integration design and the software delivery lifecycle.
Lead incident response, post-mortem culture, and continuous improvement initiatives for middleware services to reduce MTTR and eliminate repeat failures.
Ensure middleware design and operations align with regulatory, compliance, and data sovereignty requirements across cloud regions.
Evaluate and adopt emerging middleware and integration technologies across AWS, GCP, and OCI to drive innovation and operational excellence.
What you'll do
Design and architect resilient, scalable middleware infrastructure across cloud and hybrid environments with an integration-first mindset covering reliability, availability, and performance.
Architect and operate Kafka clusters, RabbitMQ brokers, and Redis caching layers with focus on self-healing, auto-scaling, and platform resilience.
Design, build, and govern API Gateways (e.g., Kong , Apigee, AWS API Gateway, Dell Bhoomi ) — covering routing, rate limiting,…