Walid Laggoune, Senior Backend Engineer

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Proficiency

Languages & Frameworks

Go95%

PHP / Laravel / Symfony98%

JavaScript / Vue.js75%

Python70%

C (learning)50%

Architecture & Infrastructure

Event-Driven / CQRS / DDD92%

Docker / AWS / DevOps88%

PostgreSQL / MySQL / MariaDB / MongoDB90%

Redis / Valkey / Caching85%

REST / gRPC / GraphQL80%

Tech tags

PHP Ecosystem

LaravelSymfonyLumenSlimPHP-SwooleLaravel QueuesLaravel HorizonLaravel Octane

Frontend

Vue.jsAlpine.jsLivewirejQueryBootstrapTailwind CSS

Architecture & API

CQRSDDDEvent-DrivenMicroservicesHigh-Availability PipelinesDesign PatternsRESTGraphQLgRPCWebSocketTCP/UDPOAuth 2.0JWT

Databases & Caching

PostgreSQLMySQLMariaDBMongoDBRDSRedisValkeyMemcachedMeilisearchQdrantVarnish

Messaging & Performance

AWS SQS/SNSRabbitMQBeanstalkd

DevOps & Observability

DockerDocker SwarmAWS ECS/ECR/SQS/S3/SNS/EC2CloudWatchNginxHAProxyGitLab CIPrometheusGrafanaDatadogElasticsearch

Testing

TDDUnitIntegrationFeatureLoad TestingtestifygomockPHPUnitPest

Go Ecosystem

net/httpchiGinFibergorilla/muxgRPCProtocol Bufferscobraviperzapzerologgo-redisGORMsqlxpgxtestifygomockgolangci-lintairdelve

Python Ecosystem

FastAPIPydanticUvicornasynciorembg

Tools & Payments

GitGitLab CI/CDCursorClaude AIStripePostman

/ experience

Work history

Dec 2025 - Present

ABOUT YOU

Hamburg, Germany

Senior Backend Engineer

Laravel · PHP · Go · gRPC · AWS SQS/S3/SNS · Valkey · Datadog

Cut worker memory by ~50% and increased throughput ~5× by redesigning monolithic PHP workers into a Go reader / PHP consumer architecture, removing blocking I/O from the critical path.
Guaranteed at-least-once delivery for millions of daily product events via a resilient AWS SNS/SQS pipeline with dead-letter queues and retry policies.
Reduced DB contention on high-frequency merchant updates with a low-latency Valkey caching layer, decoupling hot-path reads from RDS.
Modeled complex merchant and product domains using CQRS and DDD across data from Adidas, Otto, and Tradebyte.
Maintained low memory footprint on large catalog ingestion by engineering chunked S3-staged Laravel jobs and Go ingestion services.
Resolved six-figure financial exposure incidents by triaging critical bugs across event-driven pipelines under time pressure.

May 2025 - Nov 2025

CSA Research

Fullstack Developer

Laravel · PHP · MariaDB · Go

Delivered a Go-based AI chatbot backend integrating OpenAI APIs for enterprise clients including Adobe, Dell, Mozilla, and XTM International.
Reduced 80% of legacy technical debt by modernizing and re-architecting enterprise backend systems, improving maintainability and deployment reliability.

Oct 2024 - Apr 2025

Pulsetracker

Founder

Founder & Backend Developer

Laravel · PHP-Swoole · WebSockets · TCP/IP · Nginx · MariaDB · Vue.js · Redis · Stripe

Built a real-time SaaS from zero to production using PHP-Swoole, achieving 10,000 concurrent connections on a single node across WebSocket, TCP, and UDP.
Sustained 60,000+ location writes/day against MariaDB by optimizing geo queries and schema indexing, keeping p99 read latency under 30ms.
Achieved self-sustaining monetization via Stripe subscriptions with tiered plans covering geofencing, live tracking, and developer API access.
Received Innovation Award from phpclasses.org for real-time architecture design.

Apr 2020 - Aug 2024

ASEM Medical

Algiers

Backend Developer & Team Lead

Go · TCP/IP · Symfony · Laravel · PHP-Swoole · HAProxy · Nginx · MariaDB · Redis · Meilisearch · Python · FastAPI · Qdrant · rembg · AWS EC2/S3/ECR · Prometheus · Grafana · Docker Swarm · Laravel Nova

Led a 3-person team delivering REST + GraphQL APIs across 4 interconnected mobile apps, coordinating domain boundaries across Symfony and Laravel services.
Built and owned a high-performance Go TCP server processing 5,000,000+ delivery-driver location updates/day, plus thousands of real-time events (stock, order notifications), forming the core of a dispatch pipeline from client app through queues and a matching algorithm to the driver's app.
Prevented race conditions in concurrent order acceptance - ensuring exactly one driver could claim each order - and matched each order to the nearest available driver using real-time location data.
Reduced product search latency to sub-50ms across 70,000+ SKUs with a Redis + Meilisearch search layer, replacing slow SQL full-text scans.
Increased concurrent user capacity 6× by replacing PHP-FPM with PHP-Swoole coroutines and tuning Nginx upstream pool settings.
Improved product discovery conversion by 30% with a personalized recommendation algorithm across 70,000+ products using purchase history and catalog signals.
Surfaced ranking signals across 200+ store catalogs via a top-selling product algorithm aggregating sales velocity and inventory data.
Applied DDD to decompose a monolithic Q-commerce codebase into bounded contexts, enabling independent service deployments.
Built a Python FastAPI service backed by a Qdrant vector database to power recipe recommendations on the recipe reels app, surfacing similar recipes based on users' liked reels.
Automated product image background removal using rembg, integrated into the product-catalog pipeline to standardize listing images at scale.

Nov 2020 - Nov 2023

CELEC Club

USTHB, Algiers

Head of Digital Department

Laravel · Lumen · PHP-Swoole · Python · Nginx · MySQL · Meilisearch · Tailwind CSS · Vue.js

Automated applicant selection, cutting manual review time by 80% with a scoring algorithm ranking candidates against weighted criteria.
Shipped 5+ production APIs for event platforms and internal tools used by hundreds of university students.
Upskilled 50+ student developers through 8 free training sessions on Laravel, backend architecture, and database design.

/ open source