Problem

Designed a fraud detection workflow for fintech operations with risk scoring, review queues, and alerting.

Architecture

Python, PostgreSQL, Kafka shaped the foundation, with explicit delivery around maintainability and operational clarity.

Execution

• Designed layered risk scoring for transaction screening.
• Added human-review support with clearer investigation context.

Results

• Improved suspicious activity prioritization.
• Reduced manual review overhead on low-signal cases.

Problem

Built payment reliability workflows around retries, reconciliation, monitoring, and incident visibility.

Architecture

Node.js, PostgreSQL, Redis shaped the foundation, with explicit delivery around maintainability and operational clarity.

Execution

• Mapped transaction failure paths and retry strategy.
• Built reconciliation support for operations teams.

Results

• Improved visibility into failed payments.
• Reduced time to trace payment incidents.

Problem

Created a business visibility dashboard for metrics, reporting, operational tracking, and decision support.

Architecture

Next.js, TypeScript, PostgreSQL shaped the foundation, with explicit delivery around maintainability and operational clarity.

Execution

• Pulled metrics into one operational surface.
• Structured role-based visibility across teams.

Results

• Improved team visibility across workflows.
• Helped leadership make faster decisions with shared numbers.

Problem

Built subscription lifecycle systems covering plans, billing states, retention flows, and lifecycle events.

Architecture

Kotlin, Node.js, PostgreSQL shaped the foundation, with explicit delivery around maintainability and operational clarity.

Execution

• Handled subscription state transitions explicitly.
• Improved entitlement reliability in edge cases.

Results

• Reduced billing confusion.
• Improved confidence in plan state handling.

Problem

Designed an internal system for workflow automation, approvals, tracking, and operations dashboards.

Architecture

Next.js, TypeScript, PostgreSQL shaped the foundation, with explicit delivery around maintainability and operational clarity.

Execution

• Mapped manual workflows into clear states.
• Added audit-friendly tracking and ownership.

Results

• Reduced repetitive manual coordination.
• Improved operational visibility.

Problem

Structured a publishing platform for editorial workflows, approvals, scheduling, and content analytics.

Architecture

Next.js, TypeScript, CMS shaped the foundation, with explicit delivery around maintainability and operational clarity.

Execution

• Separated editorial stages clearly.
• Reduced publishing confusion across teams.

Results

• Improved publishing consistency.
• Made content operations easier to manage.

Problem

Rebuilt Android subscription flows to improve conversion, entitlement trust, and billing clarity.

Architecture

Kotlin, GraphQL, Play Billing shaped the foundation, with explicit delivery around maintainability and operational clarity.

Execution

• Refactored billing state handling with explicit contracts.
• Improved rollout safety with staged releases.

Results

• Improved conversion rates.
• Reduced billing incidents.

Problem

Modernized a cache layer to stabilize latency under traffic spikes and lower database pressure.

Architecture

Node.js, Redis, PostgreSQL shaped the foundation, with explicit delivery around maintainability and operational clarity.

Execution

• Redesigned cache keys and invalidation strategy.
• Added event-driven refresh patterns.

Results

• Stabilized p95 latency.
• Lowered database load.