Software Development Engineer II at OnebyZero – Paya Lebar Road | Jobyssey

About OnebyZero

OneByZero is a Frontier Systems Integrator building agentic AI systems for leading banks, telecommunications companies, insurers, and retailers across Asia Pacific. We work on high-impact problems for institutions operating the financial and digital infrastructure of the region.

We operate exclusively on AWS and leverage partnership programmes that provide co-sell reach, funded innovation opportunities, and delivery credibility across multiple markets. We value individuals who are technically strong, delivery-focused, collaborative, and committed to solving complex engineering challenges.

About the Role

The Software Development Engineer II (SDE II) is a mid-level engineer who owns features and components end-to-end within OBZ delivery engagements.

The SDE II designs, builds, and operates production software and services that power enterprise AI systems in regulated environments, working closely with senior engineers, architects, and delivery teams.

This role requires solid hands-on engineering capability and the ability to deliver reliably with limited supervision.

At OBZ, all engineers are expected to use AI tools effectively in their daily work. AI assistants and workflow automation tools are expected to improve engineering productivity, testing, debugging, documentation, and delivery execution.

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

Design, build, and operate production-grade services, APIs, and integrations end-to-end.
Own delivery of well-defined components, from design through testing, deployment, and monitoring.
Build backend systems in Python (FastAPI or similar) and contribute to React-based interfaces and streaming APIs.
Deploy and manage workloads on AWS services such as ECS, EKS, Lambda, API Gateway, and CloudWatch.
Implement CI/CD pipelines, automated testing, infrastructure automation, and observability tooling.
Define and execute testing strategies including unit, integration, and regression testing.
Contribute to low-level designs, code reviews, and technical documentation.
Debug and resolve production issues, improving reliability and performance.
Mentor junior engineers through reviews and pair programming.
Use AI tools to improve engineering productivity, testing, and documentation.

Requirements

What We Are Looking For

3 to 6 years of experience building production-grade software systems.
Strong engineering capability in at least one modern language (Python strongly preferred).
Experience designing and operating backend services, APIs, and databases.
Hands-on experience deploying applications on AWS (ECS/EKS, Lambda, API Gateway, IAM, CloudWatch).
Solid understanding of CI/CD, automated testing, observability, and DevSecOps practices.
Familiarity with React, Node.js, or modern web application patterns is an advantage.
Strong debugging, problem-solving, and ownership capability.

What Sets You Apart

You have shipped production systems used in enterprise or high-scale environments.
Exposure to AI/LLM applications, RAG, or agentic frameworks.
You actively use AI tools to improve delivery quality.
You contribute reusable tooling or frameworks adopted by your team.

Travel and Location

OBZ clients are based across Southeast Asia, ANZ, and Japan. Travel and onsite engagement requirements may vary depending on project needs. Relocation support may be considered based on business requirements.

What Success Looks Like

You reliably deliver components end-to-end with high quality and minimal rework.
Your services are scalable, observable, and maintainable in production.
You raise the engineering bar of the team through reviews and mentoring.
You grow toward senior-level technical ownership.

Language

Fluency in spoken and written English is required across all markets. Strong communication skills are important for collaboration across engineering teams, delivery teams, and enterprise stakeholders.

Local language proficiency is considered an advantage, particularly in Japan, Vietnam, Thailand, and the Philippines.

Certifications

AWS Certified Developer Associate or AWS Certified Solutions Architect Associate certifications are strongly valued.

Benefits

What We Offer

Competitive compensation aligned to market standards. Opportunities to work on enterprise-scale AI transformation programmes across Asia Pacific. Exposure to advanced AI tooling, AWS partnership ecosystems, and regulated-industry engineering delivery.

OneByZero is an equal opportunity employer committed to building a diverse and inclusive workplace.

Why OneByZero

OneByZero delivers production-scale agentic AI systems within some of the most complex enterprise environments across Asia Pacific. The SDE II role provides the opportunity to own meaningful engineering delivery, sharpen production skills, and grow toward senior technical ownership.

Explore more jobs

Requirements

Benefits