Mohamad K.-Senior Backend Developer
Check rate
Experience
Senior Backend Developer
Standing on Giants
- Led architecture and end-to-end engineering delivery for community-driven SaaS platforms serving 2M+ monthly active users.
- Architected and led the migration of a monolithic Python/FastAPI and PostgreSQL database and LangChain with codebase to an event-driven microservices architecture on AWS EKS, sustaining 10x traffic growth from ~150 RPS to 1,500+ RPS with zero re-architecture cycles.
- Defined and enforced engineering standards across services including API contracts, observability baselines, and deployment topology, reducing production incidents by 55% and MTTR from 2 hours to under 25 minutes within 9 months.
- Redesigned the caching and query layer using multi-tier Redis caching and database indexing/partitioning, cutting p95 API latency from 850ms to 180ms (78% reduction) and database CPU load by 45%.
- Built CI/CD platform on GitHub Actions, Terraform, and Kubernetes (EKS) with blue-green and canary rollouts, increasing deployment frequency from ~2/month to 8-12/day and reducing lead time from 10 days to under 6 hours.
- Implemented contract testing, automated load testing, and observability SLOs using Prometheus, Grafana, and OpenTelemetry, raising platform availability from 99.5% to 99.95% (10x reduction in error budget burn).
- Led and grew a cross-functional team of 8 engineers across backend, frontend, and DevOps, scaling headcount from 4 to 8 with 85% retention; owned hiring, onboarding, performance reviews, and career development.
- Partnered with Product, Design, and Client Success leadership as primary technical decision-maker; translated business goals into technical roadmaps and drove build-vs-buy decisions on authentication, search, and AI tooling.
- Introduced AI-assisted development workflows including automated code review and a RAG-based internal knowledge assistant using Graph (GraphRAG, Neo4J), increasing sprint throughput by 30% across two quarters.
- Owned incident command and production support rotation; established runbooks, postmortem culture, and on-call SLOs, reducing weekend paging incidents by 70%.
- Developed and optimized Algorithms using python libraries like Numpy and Pandas.
Senior Full Stack Developer
Devvly LLC
- Lead architect and individual contributor across 15+ client products spanning e-commerce, FinTech, and SaaS, owning systems from greenfield design through production handover.
- Designed and delivered backend architecture for high-traffic e-commerce platforms (peak ~800 RPS, 500K daily active users) using php/Laravel with MySQL and Redis, sustaining sub-250ms p95 checkout latency during Black Friday peaks.
- Introduced event-driven architecture using RabbitMQ and the transactional outbox pattern for order, inventory, and shipping workflows, eliminating dual-write bugs and improving order-processing throughput 4x (from 200 to 850 orders/minute).
- Owned production payment integrations with Stripe, Braintree, Authorize.net, and Amazon Pay, including idempotency, retry logic, reconciliation, and PCI-conscious data handling; reduced chargeback disputes by 30% after reconciliation redesign.
- Architected and shipped shipping and logistics integrations (UPS, FedEx, DHL, EasyPost) with a unified rating and labeling abstraction, reducing new carrier onboarding time from 3 weeks to 3 days.
- Led frontend re-platforming from legacy jQuery codebases to React and Next.js with SSR, improving Largest Contentful Paint from 4.2s to 1.6s (62% faster) and lifting mobile conversion by 18%.
- Established a Test-Driven Development culture using Jest, Playwright and Cypress; raised meaningful test coverage from 25% to 75% on critical paths and reduced regression bugs in production by 50%.
- Mentored 4 mid-level engineers through pair programming, code review, and architecture office hours; 2 were promoted to senior engineer during the engagement.
- Led and mentored a team of software engineers, conducting regular one-on-ones, performance reviews, and career development planning.
- Managed end-to-end software development lifecycle, including planning, architecture, implementation, testing, deployment, and maintenance.
- Collaborated with cross-functional teams including product managers, designers, QA, and stakeholders to deliver scalable and high-quality solutions.
- Defined technical roadmaps, engineering standards, and best practices to improve code quality, maintainability, and team productivity.
- Oversaw system architecture decisions and ensured scalability, security, and performance of applications and APIs.
- Coordinated Agile/Scrum ceremonies such as sprint planning, daily stand-ups, retrospectives, and backlog grooming.
- Reviewed code, enforced coding standards, and introduced processes to improve development efficiency and reduce technical debt.
Senior Full Stack Developer
TouristTube
- Architectural lead on a large-scale travel platform (bookings, reviews, itineraries) serving users across 30+ countries.
- Built a flight booking system using node/Nest.js
- Re-architected the booking pipeline into stateless services behind a load balancer with read-replica fan-out, increasing uptime from 99.2% to 99.9% and supporting 3x peak-season traffic without horizontal cost growth.
- Optimized database performance through composite indexing, query rewrites, and materialized views, reducing top-5 slow queries from over 2 seconds to under 120ms (94% improvement).
- Built recommendation and search layer using Elasticsearch with custom ranking signals, increasing booking click-through rate from 3.1% to 5.4%.
- Mentored 3 junior engineers, ran the engineering interview loop, and defined the team's first code review and CI/CD standards.
System Integration Engineer
Mobinets
- Built and operated telecom integration services in python across global operator networks; owned high-availability deployments backed by Oracle Database.
- Designed retry and recovery logic for cross-operator message flows, reducing integration failure rate by 40%.
Junior Full Stack Developer
AMC
- Developed responsive web applications using Python, MySQL, JavaScript, and Bootstrap under senior engineering mentorship.
- Contributed to UI/UX improvements and supported senior engineers on architecture rollouts.
Community Platform with AI Moderation
- End-to-end ownership of platform design and AI safety layer.
- Built Python/FastAPI and React platform with real-time messaging, groups, and CMS; designed API-first SOA for downstream integrations.
- Designed and deployed AI moderation pipeline (toxic content detection, spam classification, risk scoring), reducing human moderation workload by 60% while maintaining a sub-2% false-positive rate.
- Implemented hybrid semantic and keyword search backed by a vector database, improving content discovery click-through rate by 25%.
Multi-Tenant SaaS Commerce Platform (2agunshow.com)
- Lead architect responsible for technology stack, data model, and deployment topology.
- Built a Python/FastAPI and React platform supporting marketplaces, POS, and PWA modes; applied Domain-Driven Design with bounded contexts for catalog, orders, and tenancy.
- Designed MySQL schema with row-level multi-tenancy plus Redis caching and Elasticsearch search, serving sub-200ms p95 product search across 1M+ SKUs.
- Shipped AI-driven product recommendations and shopping assistant, increasing average order value by 12% in A/B testing.
PULS — Healthcare Claims Management Platform
- Architect and lead engineer for a regulated enterprise system.
- Designed claim lifecycle workflow engine with role-based access control (RBAC), audit logging, and SLA-driven dashboards.
- Reduced average claim processing time by 50% and eliminated a class of reimbursement disputes through automated validation rules.
Production RAG Chatbot Platform
- End-to-end design and rollout of a customer-facing knowledge assistant.
- Architected the full pipeline (ingestion, embeddings, hybrid retrieval, cross-encoder re-ranking, generation) using LangChain, OpenAI APIs, and Qdrant; sustained ~600ms median response over a 1.2M-document corpus.
- Designed multi-tenant API layer with Python/FastAPI including authentication, rate limiting, and per-tenant memory isolation.
- Reduced tier-1 support workload by 40% and improved answer accuracy on internal evaluation set from 62% to 84%.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Banking and Finance, Retail, Tourism, and Telecommunication.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Project Management, and Human Resources.
Summary
Senior Backend Developer with 10+ years architecting, building, and scaling high-traffic web platforms, distributed systems, and cloud-native applications serving millions of users. Proven track record delivering end-to-end product ownership across backend, frontend, infrastructure, and AI/ML domains. Expert in event-driven microservices, AWS, Docker, Kubernetes, TypeScript, React, Python, Node.js, PHP and modern LLM/RAG pipelines. Demonstrated impact: reduced p95 latency by 60-80%, scaled platforms 10x without re-architecture, increased deployment frequency from monthly to multiple-times-daily, and improved availability from 99.5% to 99.95%. Combines deep hands-on engineering with technical leadership including hiring, mentoring, architecture reviews, and cross-functional roadmap ownership.
Skills
- Languages: Typescript, Javascript, Python, Node.Js, Php
- Backend Frameworks: Fastapi, Nest.Js, Laravel
- Frontend: React, Next.Js, Vue.Js, Redux, Typescript, Tailwind Css, Server-Side Rendering (Ssr), Single Page Applications (Spa), Web Performance, Wcag Accessibility
- Architecture & Design: System Design, Distributed Systems, Microservices, Event-Driven Architecture, Domain-Driven Design (Ddd), Service-Oriented Architecture (Soa), Cqrs, Event Sourcing, Api Gateway, High Availability, Fault Tolerance, Scalability, Caching Strategy
- Apis & Messaging: Rest, Graphql, Grpc, Soap, Websockets, Kafka, Rabbitmq, Redis Pub/Sub, Server-Sent Events
- Cloud & Devops: Data Engineering & Workflow Orchestration: Nextflow, Aws (Eks, Ec2, S3, Lambda, Rds, Cloudfront, Cloudwatch), Gcp, Docker, Kubernetes, Terraform, Ansible, Github Actions, Gitlab Ci, Jenkins, Blue-Green Deployments, Canary Releases, Infrastructure As Code (Iac)
- Observability: Prometheus, Grafana, Opentelemetry, Datadog, Elk Stack, Distributed Tracing, Slos, Incident Response
- Databases: Postgresql, Mysql, Mongodb, Dynamodb, Neo4j, Redis, Elasticsearch, Query Optimization, Indexing Strategy, Replication
- Ai / Ml Engineering: Llms, Rag, Langchain, Openai Api, Anthropic Claude Api, Hugging Face, Pytorch, Tensorflow, Vector Databases, Embeddings, Semantic Search, Mlops, Prompt Engineering, Neural Networks
- Security: Oauth 2.0, Jwt, Saml, Zero Trust Architecture, Api Security, Secure Coding Practices, Penetration Testing, Pci Compliance
- Testing & Quality: Test-Driven Development (Tdd), Jest, Pytest, Cypress, Playwright
- Leadership: Technical Leadership, Architecture Reviews, Hiring, Mentoring, Code Review, Agile, Scrum, Roadmap Planning, Stakeholder Management, Cross-Functional Collaboration
Languages
Education
Lebanese International University
M.Sc. · Computer Engineering · Beirut, Lebanon
Certifications & licenses
AWS Certified Developer – Associate (DVA-C02)
Google Certified Digital Marketing
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Mohamad is based in Zürich, Switzerland.
Mohamad speaks the following languages: Arabic (Native), English (Intermediate), German (Elementary).
Mohamad has at least 12 years of experience. During this time, Mohamad has worked in at least 4 different roles and for 5 different companies. The average length of individual experience is 2 years and 4 months. Note that Mohamad may not have shared all experience and actually has more experience.
Based on recent experience, Mohamad would be well-suited for roles such as: Senior Backend Developer, Senior Full Stack Developer, System Integration Engineer.
Mohamad's most recent position is Senior Backend Developer at Standing on Giants.
In recent years, Mohamad has worked for Standing on Giants and Devvly LLC.
Mohamad is most experienced in industries like Information Technology, Banking and Finance, and Retail. Mohamad also has some experience in Tourism and Telecommunication.
Mohamad is most experienced in business areas like Information Technology, Product Development, and Project Management. Mohamad also has some experience in Human Resources.
Mohamad has recently worked in industries like Information Technology, Banking and Finance, and Retail.
Mohamad has recently worked in business areas like Information Technology, Product Development, and Project Management.
Mohamad holds a Master in Computer Engineering from Lebanese International University.
Mohamad has 3 certificates. These include: AWS Certified Developer – Associate (DVA-C02), Google Certified Digital Marketing, and Scrum Master Certified (SMC).
Mohamad will be available full-time from September 2026.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
Similar freelancers
Discover other experts with similar qualifications and experience
Osman T.
Zakaria A.
Arne H.
Yahya V.
Robin O.
Matthias I.
Niklas W.
Jürgen F.
Tezcan D.
Hüseyin K.
Experts recently working on similar projects
Freelancers with hands-on experience in comparable project as a Senior Backend Developer
Michael Y.
Christoph P.
Shamaila M.
Khaled M.
Mohamed A.
Sercan T.
Jamal B.
Frédéric K.
Khaled M.
Ales L.
Nearby freelancers
Professionals working in or nearby Zürich, Switzerland
Vincent V.
Marco S.
Astrid B.
Matthias S.
Tomas H.
Nik G.
Gwang Jin K.
Marc P.
Banashankari N.
Peter P.
