Resume & Certifications
Summary
Independent Backend Engineer, founder of RaynerCodes Cloud Solutions, and creator of LeverageCut — a B2B SaaS in active beta. Builder of production systems that have measurably cut Lambda request duration by 53%, reduced secrets-management costs by ~100%, and increased extraction pipeline success rates from 27.6% to 72.4%. Specializing in Python and serverless AWS architecture with hands-on depth in security-first API design, event-driven systems, and Infrastructure as Code. AWS Certified Developer Associate and Cloud Practitioner.
Certifications
Experience
RaynerCodes Cloud Solutions — Independent Backend Engineering & Consulting
Jul 2026 — Present
Backend Engineer (Contract) · Debo's Boxing and Fitness — Client Project
- Architected and deployed a full-stack serverless RESTful API and booking platform using Python, FastAPI, AWS Lambda, DynamoDB, and API Gateway — handling real-time scheduling, payment processing, and business logic for a real paying client
- Built end-to-end Stripe payment integration including webhook-driven order confirmation, idempotent payment handling, and automated conditional refunds based on real business rules
- Resolved a distributed concurrency bug where concurrent booking requests caused double-bookings — implemented an atomic conditional-write claim mechanism in DynamoDB, eliminating the race condition without locks or external coordination
- Optimized an AWS Lambda authentication workload, reducing request duration by 53% (2,334ms → 1,094ms) by tuning memory allocation (256MB → 1024MB) for a security-critical PBKDF2 password hashing operation at 600,000 iterations — with negligible cost impact due to Lambda's memory×duration billing model
- Identified and eliminated an over-provisioned per-secret KMS key architecture (15 dedicated keys across three environments), migrating to AWS Systems Manager Parameter Store and cutting monthly secrets-management costs by ~100% (~$21 → ~$0) with zero downtime across live production environments
Founder & Backend Engineer · LeverageCut — B2B SaaS competitor price-monitoring platform, active beta
- Redesigned a synchronous data pipeline to an async event-driven SQS worker architecture with partial-batch-failure handling and dead-letter queue retry policy — eliminating 100% of API Gateway timeout failures since deployment
- Integrated Google Gemini API as an AI-powered extraction layer alongside a rules-based scraping pipeline, using structured JSON schema validation, confidence scoring, and retry logic distinguishing transient from permanent failures
- Built a defense-in-depth web scraping pipeline (JSON-LD, microdata, platform-specific parsing, and Bright Data headless rendering fallback) — measurably increasing successful price extraction from 27.6% to 72.4% across a 29-site real-world test of JavaScript-heavy, anti-bot-protected e-commerce sites
- Diagnosed and resolved an intermittent production Lambda error by tracing an unclosed async HTTP client's garbage-collection timing against asyncio event loop teardown, resolving it via the SDK's own context-manager cleanup pattern
Projects
Fintech Serverless API (Loan Lending Platform)
Feb 2026 — Present
- Designed and built a serverless backend system on AWS Lambda, API Gateway, DynamoDB, and SQS FIFO implementing credit score based auto decisioning that auto-rejects high-risk applicants without human intervention — eliminating manual review overhead while enforcing one-way loan lifecycle state transitions that prevent invalid status reversals
- Implemented a security-first architecture with blast radius minimization using 6 separate customer managed KMS keys, AES-256-GCM application-level encryption, and PBKDF2-HMAC-SHA256 password hashing with 600,000 iterations and a dedicated pepper key
- Built an immutable compliance audit trail using S3 Object Lock in Compliance mode with 3-year retention, logging 100% of lifecycle events with tamper-proof retention and JWT-extracted actor identity — ensuring every loan decision is attributable and immutable for regulatory compliance
- Implemented a CI/CD pipeline with GitHub Actions, OIDC federation, CodePipeline, and CodeDeploy canary deployments with automated CloudWatch rollback — achieving zero unplanned production rollbacks by catching regressions in staging before reaching real users
- Wrote 80+ automated unit and integration tests using Pytest and Moto covering credit decisioning boundaries, lifecycle state transitions, idempotency, and authentication flows — load tested with Locust (8 concurrent users, 2-minute run) achieving 99.3% success rate (405/408 requests) with zero throttling
Open Source
SlowAPI — Python rate limiting library for FastAPI and Starlette. PR #279: resolved a Starlette 1.0 incompatibility by replacing the deprecated @app.route() with app.add_route() across the test suite and documentation.
Skills
Languages
Cloud / AWS
Frameworks
Database
Tools