Mid/Sr Fullstack Engineer ReactJS, Ruby on Rails

Share Knowledge, Empower the World

Arches is a global platform for expert knowledge, strategic solutions, and talent, with a particular strength in Asia. We connect people and insights to help organizations make better decisions and drive real impact. At Arches, titles don't drive us, purpose does. We empower ambitious professionals to grow fast and work globally with the flexibility to thrive in their own way.

Since 2019, we've grown to become a global knowledge platform connecting 200,000+ experts across industries. With offices in 8 cities and a team of ambitious professionals from 15+ nationalities, we help the world's top consulting firms, investors, and Fortune 500 companies make smarter decisions.

Backed by $6M+ funding and cutting-edge technology, we're scaling faster than ever and there's space for bold talent to grow with us.

Arches was certified as:

• Winner of the LinkedIn Impact Awards 2026
• Great Place to Work® Japan 2026
• One of Japan's fastest-growing companies (KUSABI Award 2025)

Learn more about us:

Arches is a global knowledge platform that accelerates businesses by sharing the intangible assets of "knowledge and experience" from experts around the world. By connecting people and knowledge, we support better decision-making and the creation of true impact for companies. What drives Arches is purpose, not titles. We provide an environment where ambitious individuals can grow globally in their own style.
Since our founding in 2019, we have evolved into a global knowledge platform connecting more than 200,000 experts across industries. With offices in 8 cities and a team of members from more than 15 nationalities, we support the decision-making of world-class consulting firms, investors, and Fortune 500 companies. With
more than $6 million in funding and cutting-edge technology as our foundation, we are growing at an unprecedented pace. Here you will find a field where talented individuals who are not afraid of challenges can grow together.

• LinkedIn Impact Awards 2026
• Great Place to Work® Japan 2026: Selected as a "Company with a Great Work Environment".
• KUSABI Award 2025 Winner - Received the "Business Growth Award"

INDUSTRY OVERVIEW

The Expert Network Services (ENS) industry connects our clients (consulting and investment firms) with specialized insights from top experts. With a strong focus on the Asia-Pacific region, our team is fluent in the languages ​​​​​​​​and across the area and has unmatched recruitment capabilities to find experts from any industry or niche.

ROLE OVERVIEW

You'll be one of the senior members of a new engineering team, working closely with our Tech Lead to build culture, process, and tech stack from the ground up. This isn't a cog-in-the-machine role; it's your chance to define how a team works, what tools we adopt, and how we ship.

What's in it for you:

• Global exposure - collaborate across 15+ nationalities, with our largest hub in HCMC.
• Fast-track growth - doubling in size means real leadership opportunities to Tech Lead.
• AI-first innovation - build at the frontier, not just maintain legacy systems.
• GRIT culture - Guts, Resilience, Initiative, Tenacity. We empower ownership, not titles.
• Shape the future - your decisions today become the team's DNA tomorrow.

RESPONSIBILITIES

• Deeply understand the business and requirements, and independently structure and clarify even ambiguous requests.
• Lead architecture design across the entire system or multiple features.
• Drive AI-powered full-stack development and establish implementation standards and quality benchmarks.
• Explore, learn, and evaluate new technologies, and reflect technology choices in the architecture.
• Conduct design reviews, code reviews, and mentor team members.
• Lead the establishment and improvement of the development process.

REQUIREMENTS

Required Qualifications

• 3-5 years of experience with ReactJS, TypeScript, and Ruby on Rails.
• Experience with RDBMS such as MySQL and PostgreSQL.
• Experience with Git-based team development.
• Experience using AI tools (Copilot, Cursor, Codex, Claude, etc.) in real projects.
• Ability to guide AI effectively and refine outputs.

Preferred Qualifications

• English communication skills (including technical discussions and design documentation).
• Strong business acumen with the ability to clarify ambiguous requirements and translate them into structured technical solutions.
• Proven software development and technical leadership experience at a leading technology company.
• Ability to lead architecture design across large-scale systems or multiple product features.
• Ability to independently evaluate and adopt emerging technologies to drive architectural innovation.

Mindset and Personality

• Adaptable and results-driven, thriving in a fast-paced, startup environment .
• Enjoys learning and adopting cutting-edge tools (especially AI).
• Comfortable with high ownership and responsibility.
• Ability to read and improve existing codebases.
• Values ​​clean design and maintainable code.
• Motivated to work in a global environment.
• Clear communication via Slack or similar tools.

BENEFITS

Compensation & Benefits

• Competitive base salary.
• Annual Bonus - 1-month gross salary
• Paid Leave - 12 days of annual leave, plus additional paid leave for significant life events and 8 days of sick leave
• Private Medical Insurance.
• Self-learning Budget - Up to $1000 per year

Career Growth

• Rapid Career Advancement - ​​Tackle challenging problems for top startups and gain skills for the global stage, with opportunities for swift promotions.
• Build a High-Caliber Network - Collaborate with and learn from top industry leaders and decision-makers, expanding valuable connections for career growth.

Engagement

• Enjoy a vibrant work environment with team activities, quarterly dinners, social gatherings, and office snacks and drinks. Support for employee well-being also includes sports clubs (badminton, golf, football, etc.)
• Flexible Work Arrangements

We're looking for engineers who are excited to build meaningful products from an early stage, work at the forefront of AI-driven development, and grow into globally competitive software engineers. Join us and make a real impact from day one.