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Jafar Mohammadi

@jafarmohammadi

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Senior backend engineer who architects scalable Node.js/TypeScript systems and optimizes cloud performance.

Canada

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What I'm looking for

I’m seeking a long-term contract where I can apply deep backend development and cloud infrastructure expertise—architecting scalable services, optimizing performance, and delivering reliable deployments with strong observability and security.

I’m a Senior Backend Engineer with over 10 years of experience architecting and scaling high-performance systems. I specialize in Node.js, TypeScript, and cloud-native architectures across GCP and AWS, with a strong focus on building resilient services and delivering measurable business outcomes.

As a Senior Backend Engineer and Team Lead, I’ve led a team of 5 engineers to build mission-critical decision-making tooling for a billion-dollar project. I translate complex business requirements into high-impact features and design modular systems that improve both Developer Experience (DX) and User Experience (UX).

I’m known for tackling performance and reliability challenges head-on—engineering a 900x improvement for a previously “impossible” query. I’ve also orchestrated a MySQL to PostgreSQL migration with PgPool load balancing and read/write replication for high availability, while establishing robust observability with logging, tracing, and profiling.

Across backend, data, and platform concerns, I build secure and maintainable systems: GraphQL optimization with DataLoader, transaction-safe workflows, centralized RBAC, and Redis caching to reduce latency. I automate deployment using CI/CD pipelines (GitHub Actions, Azure, and more), and I’ve supported production reliability through on-call delivery and support, including large-scale data processing with Apache Spark and Scala.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

Abidi Investments Inc.

Mar 2021 - Present (5 years 3 months)

Led a team of 5 to build a mission-critical decision-making tool, translating complex client/SME requirements into scalable features and improving both DX and UX. Delivered a 900x performance increase for a previously “impossible” query and modernized the data stack by migrating MySQL to PostgreSQL with PgPool load balancing and read/write replication.

TypeScript PostgreSQL PgPool GraphQL Data Loading Redis OpenTelemetry Docker Kubernetes

Software Engineer

Audella

Oct 2019 - Feb 2021 (1 year 4 months)

Served as a key technical contact, converting high-level client/SME requests into delivery-ready tickets and resolving production issues to meet SLAs. Built daily processing pipelines for 200+ GB of data using Apache Spark and Scala, and automated data movement from SFTP to HDFS with Apache NiFi.

Apache Spark Scala Apache NiFi Google Cloud CI CD Unit Testing

Software Engineer

Important Technologies

Feb 2020 - Apr 2020 (2 months)

Designed and secured customer-facing APIs using Node.js and integrated Okta/Auth0 for authentication. Improved script runtime from 10 minutes to 72 seconds, built an Android push-notification app with Amazon SNS, and implemented authentication workflows using Auth0 and Twilio.

TypeScript Auth0 Okta Twilio Python OAUTH2 Amazon SNS Android NodeJS

Software Engineer

BullBitcoin

May 2019 - Oct 2019 (5 months)

Built an email service using Docker, Mailgun, and React, and secured API routes with JWT authentication/authorization. Implemented CI/CD with Jenkins and Dockerized applications, creating dynamic email templates using Pug and Markdown while enforcing code quality with ESLint/Prettier and Husky.

Docker mailgun React JWT Jenkins CI CD Pug Markdown ESLint

Software Engineer

CryptoMechanics

Feb 2018 - Feb 2019 (1 year)

Developed JavaScript data aggregators to pull and normalize information from APIs like CoinMarketCap, Yahoo Finance, and Twitter. Built EOSIO data validation tooling for detecting and correcting malformed blockchain data and created web crawlers to collect and store data from sources including YouTube, Reddit, CoinTelegraph, and CoinDesk.

JavaScript API Integration Data Normalization EOSIO Blockchain Data Validation Data Storage REST APIs