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Mahmoud Galal aka krokingSenior Backend / Platform Engineer

Career

7 roles over 3.2 years, several of them running at the same time. Every card opens into what I actually shipped there — not responsibilities, outcomes.

The same career, as heat

Click a month to see what was in flight.

2023
2024
2025
2026
Backend & APIs
Cloud & Infra
Data & Search
Security
Leadership & DX
Open Source
Penny.co
Naseh.qa
Scout
TrustyCollectors
Manara.tech
Onboardbase
Dbrandria
QuieterDeeper

Heat is derived, not decorative: each cell sums how hard a track was exercised by every role running that month, plus a point for anything that shipped. Overlaps burn hotter because they were.

Role by role

    • Authored the RFC for a standalone NestJS Integration Hub, consolidating integration logic that had been scattered across branches and retiring a paid third-party platform (Prismatic).
    • Architected org-scoped configuration with a Chain of Responsibility pattern and a decorator-based handler registry — the same integration runs per-tenant field mappings, credentials and feature flags through config, not code.
    • Built bidirectional flows: outbound over RabbitMQ events, inbound over normalized HTTP callbacks, with exponential-backoff retries, alerting, AES-256 credential encryption and per-org observability.
    • Shipped SAP integration services syncing Purchase Requisitions, Vendor/Business Partner records and RFQs via CQRS handlers over RabbitMQ with durable queues, message TTLs and dead-letter exchanges.
    • Secured integration endpoints with NestJS guards enforcing org-code and per-tenant bearer validation, documented in Swagger/OpenAPI and validated with class-validator DTOs.
    • Closed ~140 of 158 Dependabot alerts via targeted npm overrides and Python upgrades, and migrated the spreadsheet engine from xlsx to exceljs to kill a ReDoS vulnerability.
    Commerce & ProcurementGov & EnterpriseSecurity
    TypeScriptNestJSNode.jsRabbitMQCQRSPostgreSQLOpenAPIDockerKubernetesSAP S/4HANAOdooOpenText
    penny.co ↗

Education

B.Sc. Computer Science

Modern Academy, Egypt · GPA 3.42 / 4.0

  • Led workshops on Open Source, Git and OSS contribution.
  • Mentored students with 44 documented OSS success stories.