Software Development Engineer I

About OneByZero OneByZero is a Frontier Systems Integrator building agentic AI systems for leading banks, telcos, insurers, and retailers across Asia Pacific. We work on mission-critical problems for organizations operating the region's financial and digital infrastructure. Operating exclusively on AWS, we combine deep technical expertise with strong partnership programs that enable innovation, scale, and delivery excellence. We build with people who are technically serious, outcome-focused, and passionate about solving complex enterprise challenges. The Role The Software Development Engineer I (SDE I) is an early-career engineer who builds, tests, and ships production software as part of OBZ delivery teams. Working under the guidance of senior engineers, the SDE I contributes to features, services, and tooling that support enterprise AI systems deployed in regulated environments. This role is focused on developing strong engineering fundamentals, writing clean and well-tested code, and learning to deliver reliably within AWS-based production environments. 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 Will Do Implement well-scoped features, services, and bug fixes under the guidance of senior engineers. Write clean, readable, well-tested code following OBZ engineering standards and code review practices. Build and maintain backend services and APIs (e.g. Python, FastAPI) and contribute to front-end interfaces where required. Develop and run unit and integration tests, and help maintain automated testing workflows. Deploy and operate workloads on AWS services such as ECS, Lambda, API Gateway, and CloudWatch under supervision. Participate in code reviews, design discussions, and agile ceremonies, incorporating feedback quickly. Debug and resolve defects across development, staging, and production environments. Document code, configurations, and runbooks to support maintainability. Use AI coding assistants and automation tools to improve productivity and code quality. Requirements What We Are Looking For 0 to 2 years of experience in software engineering, or a strong portfolio of academic, internship, or open-source work. Solid programming fundamentals in at least one language such as Python, Java, TypeScript, or Go. Understanding of data structures, algorithms, APIs, databases, and version control (Git). Exposure to cloud platforms (AWS preferred) and a basic understanding of CI/CD and testing. Eagerness to learn, strong problem-solving instincts, and attention to detail. Ability to communicate clearly and collaborate within a team. What Sets You Apart Internship or project experience shipping software used by real users. Exposure to AWS, containers, or AI/LLM application development. You actively use AI tools to accelerate learning and improve code quality. Contributions to open-source or personal engineering projects. 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 consistently deliver well-tested, reviewed code within expected timelines. You grow rapidly in technical capability and require progressively less guidance. You contribute positively to team velocity and engineering quality. You develop into a dependable engineer ready to take on larger scope. 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 Cloud Practitioner or AWS Certified Developer Associate certifications are 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 I role is an opportunity to build strong engineering foundations, learn from senior engineers, and grow into a high-impact production software engineer.