Sr. Software Engineer I - Backend

Job Description

About OnebyZero

OnebyZero is a next-generation Data and AI consulting company, headquartered in Singapore and driving impact across APAC. As an AWS-exclusive partner, we help enterprises modernize data, transform with AI, and apply Generative AI in ways that deliver real business results.

Our vision is simple while at the same time ambitious : to make AI adoption both impactful and human-centered. We collaborate with leading enterprises in banking, telecommunications, retail, and other industries to help them unlock tangible value from their data and AI initiatives. By combining deep industry expertise, trusted partnerships, and a relentless focus on outcomes, OnebyZero empowers organizations to go beyond pilots and achieve lasting, scaled impact

About the Role

We are seeking a Senior Software Engineer I – Backend with 7–9 years of professional experience to lead backend development for complex, scalable systems. This role combines deep technical expertise, client-facing engagement, and leadership responsibilities. You will design, implement, and optimize backend services, drive delivery excellence, and mentor junior engineers while collaborating with cross-functional teams.

What You'll Do & The Impact You'll Have

• Lead backend system design, estimation, and implementation efforts.
• Build and deploy highly scalable APIs on AWS, applying best practices in networking (VPC, DNS, NLB, Cloud NAT).
• Own and optimize CI / CD pipelines and ensure secure deployments with CORS, WAF, and IAM policies.
• Act as the client-facing technical lead during discussions, deep-dives, and delivery presentations.
• Guide L3–L5 engineers, review architecture decisions, and mentor team members.
• Deliver large components / modules, ensuring reliability, maintainability, and scale.
• Balance 50% leadership (reviews, client alignment) and 50% individual contribution (core components, POCs).

Requirements

What You'll Bring to the Table

Must-Have Skills :

Nice-to-Have Skills :

Benefits

What We Bring to the Table

OnebyZero is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.

Requirements

What You'll Bring to the Table Must-Have Skills : Strong communication skills : fluent in English or a native ASEAN language Expert in Python or TypeScript programming patterns Experience designing and deploying scalable APIs on AWS Deep understanding of networking : VPC, DNS, NLB, Cloud NAT Ownership of CI / CD pipelines and secure deployment practices Leadership experience : guiding engineers and reviewing architecture Delivery excellence : owning large modules, client-facing responsibilities Nice-to-Have Skills : Designing cost-efficient architectures using AWS cost tools Building advanced queuing pipelines (Kafka, SQS + Lambda) Implementing multi-tenant backend systems Establishing SOC2-aligned logging and tracing Defining and enforcing REST API versioning standards