Lead AI Email App Engineer (Backend & Client Platforms)

Bjak; Indonesia; On-site; IDR 400,000,000 - 650,000,000; Full time

Job summary

Bjak is seeking a Lead Software Engineer, AI Email Apps, to own and shape the engineering layer that turns AI capabilities into a reliable product. You will lead architecture across backend services, APIs, and client applications, while guiding a small team of senior engineers and balancing latency, reliability, and cost.

You will stay hands-on, make critical architectural decisions, and ensure the system scales efficiently as real-world usage grows.

Qualifications

• Significant experience leading application or product engineering for complex systems.
• Strong hands-on background building and shipping backend systems used in production.
• Experience building AI-powered products or systems that integrate with modern ML/LLM capabilities.
• Strong technical judgment and the ability to make decisions with incomplete information.
• Comfortable working across backend and client platforms, with deep expertise in at least one.
• A strong bias toward ownership, shipping, and learning from real-world usage.
• High standards for code quality, reliability, and engineering fundamentals.

Responsibilities

• Own the application engineering strategy and execution across backend, mobile, and desktop.
• Design reliable systems for AI-powered workflows, including state, orchestration, tool use, retries, fallbacks, and failure handling.
• Build the APIs and abstractions that connect AI systems to real-world product experiences.
• Lead a small, senior engineering team and raise the technical bar through design reviews, code reviews, and hands-on mentorship.
• Make high-impact trade-offs across latency, reliability, cost, security, and user experience.
• Establish strong production foundations: observability, monitoring, testing, and operational excellence.
• Partner closely with ML leadership to turn model capabilities into robust, shippable product experiences.
• Move quickly while keeping the architecture simple, maintainable, and ready to scale.

Skills

Lead engineering ownership

Backend systems

AI-powered product

Decision making

Cross‑platform work

Code quality

Mentorship

Job description

Bjak is seeking a Lead Software Engineer, AI Email Apps, to own and shape the engineering layer that turns AI capabilities into a reliable product. You will lead architecture across backend services, APIs, and client applications, while guiding a small team of senior engineers and balancing latency, reliability, and cost.

You will stay hands-on, make critical architectural decisions, and ensure the system scales efficiently as real-world usage grows.