As a Backend Engineer at Everfit, you’ll play a critical role in shaping the infrastructure behind our AI-powered fitness coaching platform. Your contributions will directly support coaches and users around the world.

Your impact:

- Design, build, and maintain core payment, subscription, and billing services with high reliability and data consistency.
- Lead backend development for Stripe integrations, including:
   - Stripe Subscriptions & Billing
   - Stripe Connect (account onboarding, payouts, transfers, balance reconciliation)
   - Payment Intents, Checkout, Invoices, and Webhooks
- Build secure and scalable payout flows for coaches and partners across regions.
- Design systems with strong idempotency, retry, and failure-handling strategies for financial transactions.
- Own services from development through production launch, including rollout, monitoring, and post-launch support.
- Monitor live systems using observability tools (e.g., Datadog) to ensure the health of payment flows.
- Handle production incidents, perform root-cause analysis, and drive long-term reliability improvements.
- Collaborate closely with Product, Finance, and other Engineering teams to deliver monetization features.
- Mentor other backend engineers and contribute to architecture and technical standards.

• 5+ years of professional backend engineering experience.

• Strong experience building financial, payment, or subscription-based systems in production.

• Hands-on experience with Stripe, including:
 - Stripe Connect (Standard / Express / Custom accounts)
 - Subscriptions, Billing, Webhooks, and Invoices

• Solid understanding of payment lifecycles, reconciliation, and edge cases.

• Familiar with fraud and risk management concepts, including:
 - Chargebacks and dispute handling
 - Abnormal transaction detection
 - Payment verification and protection flows

• Proficient in Node.js (ES6+), RESTful APIs, and microservice architectures.

• Strong experience with PostgreSQL, Redis, and transactional data modeling.

• Hands-on experience with monitoring, logging, and alerting tools such as Datadog.

• Proven ability to debug and operate production systems under real traffic.

• Strong sense of ownership, accountability, and reliability, especially when working with money.

• Comfortable working cross-functionally in an Agile/Scrum environment.

• Good English communication skills.

[Nice to have]

• Experience with Stripe Radar or other fraud detection tools.

• Familiarity with PCI-DSS principles and secure payment architecture.

• Experience with multi-currency, cross-border payments, or tax/VAT handling.

• Experience with event-driven architectures (Kafka, SQS).

• Experience building internal financial tooling (reconciliation, reporting, payout dashboards).

• Experience applying AI or automation to monitoring, fraud detection, or operational workflows.

Why Join Everfit?

- Be part of an AI-first company redefining fitness and wellness.
- Help build the future of personalized wellness with AI agents and a groundbreaking B2C marketplace for training and coaching.
- Be rewarded with a competitive compensation package.
- Work alongside world-class talent from companies like Apple, Meta, Uber, Patreon, and Nike, united by a shared passion for impact and excellence.
- Work with a high-performing organization in Vietnam, driving innovation that scales across the US, UK, and beyond.
- Collaborate globally with founders and leaders who believe in clarity, ownership, and joyful progress at work.
- Work in a collaborative and fast-paced environment with a team that values dedication, creativity, and joy.
- Opportunity to shape the future of a high-growth global startup.

Our Perks and Benefits

Compensation & Benefits:
- Competitive salary with 13th-month pay and performance bonus.
- 15 days paid leave (annual leave + sick leave).
- Full social insurance coverage and premium healthcare benefits.

Build Your Career with Impact:
- Be part of a mission-driven company that's transforming human potential.
- Empower over 280,000+ coaches in more than 200 countries.
- Make a global impact while building a meaningful, purpose-driven career.
- Continuous training and mentoring.

Work Environment:
- English-speaking, international environment promoting open communication and collaboration.
- Work alongside world-class talent from top global companies.
- International team for global career growth.
- State-of-the-art equipment provided.
- Beautiful working environment near Danang's city center and Hanoi office.

Health & Wellness:
- PVI health insurance program and annual health check-ups.
- Active sports clubs (football, badminton, pickleball) and company retreats.
- A modern pantry designed for relaxation and social connection.
- Monthly wellness and learning workshops to recharge and grow.

AI-first company shaping the future of fitness
Join a passionate global team across VN, US, & UK
Collaborative team valuing joy & creativity