Principal Software Engineer

Triwill Group; Sydney; Hybrid; AUD 180,000 - 240,000; Full time

Job summary

Triwill Group is seeking a Principal Software Engineer to own the technical direction for major products and systems. This hands-on leadership role combines architecture with coding, prototyping, reviews and production problem-solving to drive critical engineering work from idea to production.

You will design scalable, reliable backend, frontend, APIs and infrastructure, mentor engineers across teams, and guide trade-offs on speed, cost and maintainability.

Qualifications

• 7+ years of software engineering experience building production systems.
• Deep expertise in backend, frontend, distributed systems, APIs, databases or cloud infrastructure.
• Strong system design and architecture skills for complex or high-scale systems.
• Strong coding ability and willingness to remain hands-on.
• Track record of technically leading major engineering projects from design through production.
• Ability to make sound technical trade-offs, influence engineers and solve complex production problems.

Responsibilities

• Owning technical design and execution for major products, systems and engineering initiatives.
• Designing scalable, reliable systems across backend, frontend, APIs, databases and infrastructure.
• Building alongside the team through coding, prototyping, code reviews, debugging and production problem-solving.
• Driving architecture decisions and trade-offs across speed, scalability, reliability, cost and maintainability.
• Turning ambiguous product problems into clear technical solutions and execution plans.

Skills

Software engineering

System design

Backend systems

Frontend systems

APIs

Databases

Cloud infrastructure

Hands-on coding

Job description

Description: THE ROLE

BJAK builds technology products used by millions of users across Southeast Asia. As our products and systems scale, we need technical leaders who can solve difficult engineering problems and raise the engineering bar around them.

The Principal Software Engineer owns technical direction and execution for major products and systems. This is a hands‑on role - you will design systems, write code, and drive critical engineering work from idea to production.

WHAT YOU'LL OWN

• Owning technical design and execution for major products, systems and engineering initiatives.
• Designing scalable, reliable systems across backend, frontend, APIs, databases and infrastructure.
• Building alongside the team through coding, prototyping, code reviews, debugging and production problem-solving.
• Driving architecture decisions and trade-offs across speed, scalability, reliability, cost and maintainability.
• Turning ambiguous product problems into clear technical solutions and execution plans.
• Raising engineering quality through stronger system design, testing, security, observability and development practices.
• Leading technically critical initiatives and mentoring engineers across teams.

What We're Looking For

• 7+ years of software engineering experience building and shipping production systems.
• Deep expertise in backend, frontend, distributed systems, APIs, databases or cloud infrastructure.
• Strong system design and architecture skills for complex or high-scale systems.
• Strong coding ability and willingness to remain hands‑on.
• Track record of technically leading major engineering projects from design through production.
• Ability to make sound technical trade-offs, influence engineers and solve complex production problems.

NICE TO HAVE

• Experience scaling engineering teams, systems or development practices through significant growth.
• Experience operating across multiple products, markets or countries.

LOCATION

This is a remote role. We hire globally and work across multiple countries and time zones. Candidates should be comfortable working effectively in a distributed, fast-moving international team and collaborating with colleagues across different locations.

LANGUAGE

English is our main working language across global teams. Strong English communication is required.

INTERVIEW PROCESS

1. Online assessment or practical task
2. Technical interview
3. CEO / final round

For strong candidates, we aim to complete the process and make an offer within 1 week from the start of the interview process. Candidates who complete assessments quickly will be prioritized.