Backend Engineer

We are seeking a Senior Backend Engineer to design and build the core infrastructure powering the Kaylus ecosystem. This role will focus on backend architecture, data systems, and fraud-resistant transaction processing built on Google Cloud Platform (GCP).

You will work directly with the CTO and mobile/web engineers to build scalable infrastructure supporting offer redemption, campaign targeting, fraud scoring, and financial reconciliation.

Key Responsibilities

Platform Infrastructure

Design and build backend systems powering the Kaylus consumer rewards platform, including:

· Receipt ingestion and processing pipelines

· Offer redemption and validation workflows

· Fraud detection and anomaly scoring systems

· Consumer activity and event ledgers

· Campaign and offer rule engines

Architect scalable cloud infrastructure using GCP services such as BigQuery, Firestore, Cloud Run, and Pub/Sub.

Data Systems

Develop and optimize high-performance data pipelines supporting:

· Consumer activity tracking

· Offer targeting

· Campaign analytics

· Redemption validation

Design database schemas and event models supporting both real-time operations and downstream analytics.

Fraud and Trust Infrastructure

Work with the engineering team to implement systems that detect and prevent fraud, including:

· Receipt validation pipelines

· Anomaly detection signals

· Trust scoring models

· Behavioral fraud indicators

Collaboration

Collaborate closely with

Do you have experience in Teamwork?, 5+ years backend engineering experience building scalable systems.

Strong experience with:

· Python, Node, or Go

· SQL and NoSQL databases

· Distributed systems or event-driven architecture

· API development and backend services

Experience with cloud platforms (GCP preferred) including services such as:

· BigQuery

· Firestore

· Pub/Sub

· Cloud Run

Strong ability to design systems from first principles. Comfort working in a startup environment with evolving requirements.

Preferred Qualifications

Experience building:

· Fintech platforms

· Ad tech systems

· Loyalty or rewards platforms

· Fraud detection infrastructure

· Experience with machine learning pipelines or anomaly detection systems.

Pulled from the full job description

• Parental leave
• 401(k)
• Health insurance
• 401(k) matching
• Paid time off
• Vision insurance
• Health savings account, Opportunity to build core infrastructure for a new consumer platform at the intersection of:

· Fintech

· Ad tech

· Loyalty

· Consumer data

Early role with high technical ownership and architectural impact.

Startup environment combining product innovation with real-world scale.

Competitive salary, 401K, health, dental, and vision benefits.

Job Type: Full-time

Pay: $120,000.00 - $135,000.00 per year, * 401(k)

• 401(k) matching
• Dental insurance
• Flexible schedule
• Health insurance
• Health savings account
• Paid time off
• Parental leave