Sr. Software Engineer I - Backend

OneByZero.com

Office

Hanoi, Vietnam

Full Time

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:

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

Benefits

What We Bring to the Table

Impact-First Culture: Your work directly contributes to real-world AI solutions and business outcomes.
Professional Growth: Continuous learning opportunities, mentorship from industry leaders, and a clear path for career development.
Competitive Compensation: Market-leading salary, benefits, and incentives.
Dynamic Team Environment: Collaborate with a high-performing team that values curiosity, integrity, and ownership.
Global Exposure: Opportunities for international travel.

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