• Amazon seller analytics covering marketplace analytics, FBA, finance, PPC, and inventory.
• Diagnosed a production failure where recurring sync jobs silently stopped after each deploy; traced it through BullMQ job state, ioredis connections, Node.js process lifecycle, and Railway scheduler behavior, then added explicit shutdown handling across 17 cron processes.
• Integrated Amazon SP-API and Amazon Ads authentication end to end: OAuth, LWA token exchange, credential management, onboarding state, and encrypted credential storage.
• Extended the platform to UK and EU marketplaces by threading marketplace and currency context through every service, including VAT-aware margin calculations.
• Cut dashboard load times by moving expensive aggregations from application code into SQL and removing duplicate database queries.
• Replaced a drifting migration history with an idempotent, additive migration process after finding the production schema out of sync with the repository.
• Corrected financial and inventory figures by sourcing fees and costs from authoritative Amazon endpoints instead of incomplete downstream records.

• Owned a production real-money gaming platform end to end: loyalty, payouts, fraud, and reporting.
• Improved platform performance ~30% through database indexing, read/write separation, system-wide caching, pagination, transactional operations, and a redesign of the status-checking system.
• Reduced infrastructure costs ~35%, an estimated $100K per year, through database, caching, and resource optimization.
• Cut report generation on ~1 million record datasets from 2 hours to under 30 minutes by reworking data access and report processing.
• Designed a gRPC and Protocol Buffers service architecture for new gaming features, including PHP and React clients, shared abstractions, and PHAR packaging for production.
• Built fraud monitoring that scored gameplay activity, balances, wins and losses, active days, and transaction behavior to flag suspicious deposit and withdrawal patterns.
• Mentored 3 junior engineers on API development, debugging, code quality, and system design.

• Migrated a legacy PHP API to Node.js and tRPC across campaigns, creatives, line items, P&L, affiliates, and dashboard functionality.
• Reimplemented complex legacy SQL behavior in Prisma while keeping business rules and data consistent between the legacy and new platforms running in parallel.
• Reduced report generation time ~40% by moving generation off the backend and into a Google Cloud Storage workflow.
• Rebuilt API validation in Zod without changing existing application behavior, and wrote unit and integration tests reaching ~85% coverage on migrated code.

• Backend for complaints, document approvals, and internal communication, with access control and encryption around sensitive constituent data.
• Traced multi-minute slowdowns on incoming email records to missing indexes and improved those operations by more than 10x.
• Integrated AI services for threat detection and message classification in communication workflows.

• Integrated Mastercard, Visa, Telebirr, and commercial bank payment APIs on the client of products that have handled more than 3 billion ETB and 100K+ downloads.
• Implemented payment workflows covering transaction states, callbacks, failures, retries, verification, and reconciliation across external providers.
• Replaced legacy SOAP integrations with REST APIs while keeping communication reliable against incomplete and inconsistent provider documentation.
• Raised the GTmetrix score from 45 to 97 and reduced page load times ~25% through code splitting, lazy loading, and asset optimization.

• Resume generation, cover letters, and ATS feedback using OpenAI and Gemini.
• Supported 500+ user profiles across generation and feedback workflows.
• Tracked model usage and spend per generation so AI cost did not disappear into a shared bill.

Undergraduate work in data structures, software lifecycle and architecture, web and mobile development, and internet security.