Senior Software Engineer – Distributed Systems

At Toku, we create bespoke cloud communications and customer engagement solutions to reimagine customer experiences for enterprises. We provide an end-to-end approach to help businesses overcome the complexity of digital transformation and deliver mission-critical CX through cloud communication solutions. Toku combines local strategic consulting expertise, bespoke technology, regional in-country infrastructure, connectivity, and global reach to serve the diverse needs of enterprises operating at scale. Headquartered in Singapore, Toku supports customers across APAC and beyond, with a growing footprint across global markets. As a Backend Engineer at Toku, you will play a senior backend-first role designing, building, and operating the backend services that power Toku’s omnichannel communications platform. This role sits within a fast-moving engineering squad responsible for integration-heavy backend systems and high-volume communication workflows across messaging, notifications, and voice services. You will work primarily in Go, contributing to scalable event-driven systems, backend integrations, distributed services, and production-critical communication infrastructure. This role prioritises backend depth, system design capability, distributed systems thinking, and ownership over full-stack breadth. You will be a strong fit for this role if you enjoy reasoning deeply about backend systems, solving complex production problems, and driving scalable backend solutions independently in real-world environments. What you will be doing Backend services & APIs : Design, build, and maintain robust backend services and APIs that power Toku’s omnichannel communications platform. Integration platform development : Develop and evolve backend integrations connecting Toku’s platform with external communication providers, internal platform services, and asynchronous messaging workflows. Event-driven systems : Build and maintain scalable event-driven backend systems using technologies such as Kafka and AWS SQS to support high-volume asynchronous communication workflows across messaging, notification, and voice services. System design & architecture : Independently design microservices, define service boundaries, and reason about scalability, latency, reliability, traffic patterns, and architectural trade-offs across distributed systems. Cloud-native backend development : Develop and operate backend services on AWS using cloud-native design principles and modern backend engineering practices. Production ownership : Own backend systems in production, including reliability, observability, troubleshooting, performance optimisation, incident investigation, and continuous improvement of critical communication services. Backend modernisation : Contribute to the ongoing evolution of backend services and platform architecture, including migration toward more scalable event-driven systems and greater adoption of Go across backend services. Data & persistence : Design and work with SQL-based data models, ensuring performance, correctness, and alignment with real product usage; exposure to NoSQL technologies is beneficial but not mandatory. Technical quality : Write clean, maintainable, and well-documented backend code, and participate actively in technical discussions, code reviews, and backend design decisions. Ownership & initiative : Take initiative and drive backend problems through to solutions independently, collaborating effectively with peers across engineering squads and infrastructure teams. We’d love to hear from you if you have Senior backend engineering experience : Hands-on experience building and operating production backend systems, with depth and exposure valued more than strict years of experience. Go (Golang): Strong practical experience building backend services and production systems in Go. Distributed systems & backend architecture: Proven ability to design scalable microservices, event-driven systems, and backend architectures, including reasoning about scalability, latency, reliability, asynchronous workflows, and system trade-offs. Event-driven systems : Practical experience with technologies such as Kafka, AWS SQS, or similar messaging/event-streaming systems. Backend integrations & APIs: Experience designing and integrating backend APIs and distributed backend services in production environments. Cloud platforms: Strong cloud fundamentals, with AWS experience strongly preferred. Candidates with solid GCP or Azure backgrounds are also welcome if cloud engineering fundamentals are strong. Databases: Strong SQL experience, including schema design, query optimisation, and real-world production data handling. Exposure to NoSQL databases such as DynamoDB is beneficial but not mandatory. Production mindset: Experience shipping, operating, troubleshooting, and evolving backend systems in real-world production environments. Problem ownership: A track record of taking initiative, solving problems independently, and driving backend solutions end-to-end without excessive oversight. TypeScript exposure: Experience working with TypeScript-based backend services is useful, particularly when working with existing or legacy services. Domain experience (bonus): Exposure to CPaaS, CCaaS, messaging, voice, telephony, or communication platform environments is advantageous. Observability & diagnostics (bonus): Familiarity with observability, logging, monitoring, and troubleshooting practices within distributed backend systems is beneficial. Location: This role supports globally distributed engineering squads across APAC and Europe. The role can be based in Bangalore, India, or in The Netherlands Toku has been recognised as a LinkedIn Top Startup and by the Financial Times as one of APAC’s Top 500 High Growth Companies. If you’re looking to be part of a company on a strong growth trajectory while working on meaningful, real-world backend engineering challenges at scale, we’d love to hear from you.