Idempotency: A Deep-Dive Triggered by a Real-World Double-Charge Failure
Payments should never charge twice. I break down Post/Redirect/Get, idempotency keys, and storage-layer guarantees that keep retries from corrupting state.
Read on MediumHi, my name is
Umar Ejaz Imam.
Backend-focused engineer who builds across the stack from efficient APIs to the systems that keep them running.
About Me
I'm a software engineer with a strong lean toward backend, passionate about writing clean, reliable code that scales. I enjoy working on APIs, infrastructure, and distributed systems, with a solid grounding in DSA, system design, and low-level thinking.
I code primarily in Node.js, C++, Python, and Go. Outside of work, I contribute to open source, obsess over CI/CD pipelines, and believe good observability is what separates a good system from a great one.
Contact Me
Professional Experience
Siemens Technology
Software Developer
Python · Flask · PostgreSQL · Grafana · pandas · openpyxl · python-docx
- Built a backend analytics and automation platform used across 20+ engineering teams for bug classification, release tracking, and operational reporting.
- Designed configurable ingestion pipelines to process inconsistent Azure DevOps/TFS exports with schema normalization, dynamic headers, duplicate-column handling, and bounded extraction workflows.
- Developed a hybrid rules-based classification engine spanning 18+ functional domains using prioritized keyword matching and override mappings for automated defect categorization.
- Implemented regression spike detection and trend analysis pipelines with functional-area attribution for release-quality monitoring and anomaly detection.
- Built PostgreSQL-backed Grafana dashboards and automated DOCX reporting pipelines with LLM-assisted summaries, reducing manual reporting time from ~6 hours to under 2 minutes (~99% reduction).
Marine Edge
SDE Intern
- Refactored legacy PHP workflows into modular backend services with improved validation, maintainability, and clearer service boundaries.
- Designed REST API contracts for payment integrations, improving backend consistency and workflow reliability across service interactions.
- Implemented validation, error handling, and state management logic to prevent duplicate transactions and invalid payment flows.
- Improved backend reliability by debugging integration failures and strengthening service behavior across critical workflows.
Featured Projects
- Built a payment orchestration platform simplifying multi-gateway transactions with modern full-stack engineering, emphasizing scalability and authentication.
- Designed a layered architecture with worker queues for charge and reconciliation flows, per-user dashboards, comprehensive error handling, and real-time lifecycle polling.
- Deployed with automated GitHub Actions to Render using Supabase for persistent storage, staging/production environments, and full observability.
FixItDaddy
Python · FastAPI · Go · Chronos · PostgreSQL · Redis · Docker · Kubernetes
- Built an autonomous remediation control plane where Vigil detects issues, evaluates policy, and decides when to trigger remediation through Chronos.
- Designed the service split so Vigil stays the decision plane while Chronos handles durable scheduling, worker execution, retries, and dead-letter recovery.
- Hardened the integration contract around idempotency, tenant isolation, auditability, and deterministic status sync back into incident timelines.
- Expanded the operational story with correlation persistence, fail-safe retries, and end-to-end contract validation for duplicate, failure, and recovery paths.
TorrentEdge
Node.js · Express · Kafka · Nginx · Docker · Redis
- Developed a distributed P2P file-sharing platform using Kafka event streams for real-time peer discovery, status updates, and reliable synchronization.
- Architected a scalable node network with Nginx load balancing, Docker containerization, and Redis caching for fast peer lookups and connection management.
- Implemented resilient communication patterns with automatic retry logic, exponential backoff, and optimized peer synchronization to ensure reliable transfers under network volatility.
Other Notable Projects
FastAPI · Pydantic · NVIDIA NIM · JavaScript · Python
- Built an Autonomous AI Insurance Agent for FNOL document extraction and deterministic business-rule routing.
- Implemented a decoupled pattern using probabilistic inference for data extraction and deterministic rules for decision routing.
- Developed a multi-step pipeline integrating NVIDIA NIM to ingest raw PDFs, parse structural claim data, and enforce priority queue assignments.
- Developed an enterprise-grade AI RFP Management Platform that automates the procurement lifecycle by parsing unstructured vendor proposals.
- Integrated Groq Llama-3 to ingest emails via IMAP/SMTP and translate natural language intents into structured Request for Proposal requirements.
- Built a smart comparison engine performing intelligent side-by-side evaluations of vendor bids and deviations using vector-ready data structuring.
projectmanager
Go 1.22 · PostgreSQL 16 · React · JWT · Docker
- Engineered a full-stack task management platform with a Go API backend and React frontend supporting project collaboration and task lifecycles.
- Designed the data access layer using pgx with embedded SQL migrations, favoring explicit hand-written SQL over ORMs for query predictability.
- Implemented secure JWT authentication, role-based business logic, and containerized the local development workflow with Docker Compose.
CipherNet
Node.js · Express · Docker · OpenVPN · IPsec
- Built a secure VPN platform with Node.js and Express offering encrypted tunnels and global server routing.
- Implemented JWT-based authentication, role-aware management, and encrypted file transfer workflows.
- Packaged OpenVPN/IPsec configurations inside Docker for reproducible deployment and real-time health monitoring.
LogWise
FastAPI · React · Tailwind CSS · Ollama · Docker
- Delivered an AI-assisted log analyzer that digests massive server logs into natural-language summaries using local LLMs via Ollama.
- Built a FastAPI backend with React + Tailwind UI for fast uploads, context-aware triage, and actionable diagnostics.
- Packaged the stack with Docker Compose, keeping analysis offline while exposing root causes, warnings, and remediation hints instantly.
Taska
TypeScript · Node.js · Next.js · PostgreSQL · Redis · Kafka · Nginx
- Architected a decentralized blockchain platform with microservices for consensus, staking, wallet ops, and explorer queries.
- Implemented services in TypeScript (Node.js) with Next.js frontends backed by PostgreSQL, Redis caching, and Kafka streams.
- Hardened ingress with Nginx and containerized deployment for scalable, secure infrastructure.
Ecom Microservice GraphQL
Node.js · GraphQL · Kafka · MongoDB · Docker
- Composed independent user, product, and order services behind a federated GraphQL gateway for a unified ecommerce API.
- Streamed cross-domain signals with Kafka, pairing producers/consumers to keep services eventually consistent and auditable.
- Containerized the stack with Docker Compose, wiring MongoDB per service plus automated Jest coverage for resolvers and APIs.
Terminal Time Traveler
C++17 · nlohmann/json · Docker · CLI
- Built a retro-inspired CLI explorer that parses modular JSON timelines to surface events for any year instantly.
- Leveraged modern C++17 with nlohmann::json for fast file parsing and extensible data loading.
- Containerized the workflow with Docker so the tool runs consistently across environments and doubles as an educational reference.
- Documented extension paths—additional JSON feeds, fuzzy search ideas, and CLI hooks—to guide contributors toward new features.
Node.js · Express · ClickHouse · CSV · JWT
- Shipped a bidirectional ingestion app that syncs ClickHouse tables with CSV flat files from a web UI.
- Implemented JWT-secured Express APIs with column-level selection, record counts, and detailed status reporting.
- Orchestrated file uploads, previews, and CSV transforms using multer, csv-parser, and json2csv for smooth operator workflows.
Featured Blogs
TorrentEdge — A Distributed BitTorrent Client
Reimagining BitTorrent for the cloud era with Node.js, Kafka, MongoDB, and Docker—covering architecture choices, observability, and scaling lessons.
Read on MediumEducation & Coursework
BMS Institute of Technology
B.E. in Information Science and Engineering · 2021 – 2025 · Bengaluru, Karnataka
Coursework: Data Structures & Algorithms, Object-Oriented Programming, Operating Systems, Database Management Systems, Computer Networks.
Certifications: Fundamentals of Backend Engineering, Docker Networking: Creating, Managing, and Troubleshooting Container Networks, Prometheus & Grafana: Monitoring Application Performance, Software Architecture: Patterns for Developers, Advanced Linux Networking and Security.
Skills
Languages & Patterns:
C++ · Python · Go · JavaScript
Distributed Systems · Event-Driven Design · Clean Architecture
Tools & Infrastructure:
AWS · GCP · Docker · Linux
GitHub Actions · Jenkins · GitOps
PostgreSQL · Redis · Kafka · BullMQ
Observability & Reliability:
Grafana · Azure DevOps APIs · GitLab APIs
REST API Observability · Incident Automation · Chaos Testing