Mahammad Hajiyev
Mahammad Hajiyev

Senior Software Engineer

Open to offers · Member since 3 Nov 2026
Location
Fremont, United States
Desired salary
150k–190k USD/yearly
Work preference
Remote Only / Full Time, Part Time, Contract
Experience level
Senior

About

Professional summary

I am a Senior Software Engineer with more than seven years of experience designing, building, and operating production applications across AI-enabled SaaS, biotechnology, logistics, fintech, and data-driven products.

I work across the full product lifecycle, from React and TypeScript interfaces to Node.js and Python backend services, API design, relational databases, authorization, integrations, and production delivery.

I have built customer-facing workflows for onboarding, dashboards, account management, real-time dispatch, payment reconciliation, and appointment booking. I enjoy translating complex operational requirements into reliable, maintainable software.

My backend experience includes Node.js, Express.js, Python, Django, REST APIs, GraphQL, webhooks, PostgreSQL, MySQL, and third-party integrations such as Plaid, Google Calendar, and SMS services.

I also have hands-on AI evaluation experience, including RLHF ranking, SFT feedback, data annotation, adversarial prompting, safety testing, and identifying hallucinations, logical issues, and bias in large language model responses.

I am currently building and operating an AI receptionist product as a founder and solo engineer, while remaining open to opportunities where I can contribute senior full-stack and backend engineering expertise.

Skills

29 capabilities

Tech stack & tools

Working toolkit

Data Stores

Development

Languages & Frameworks

Experience

Career history

AI Trainer & Data Annotation Specialist Expert Data Annotation

I evaluate and annotate AI-generated responses across creative writing, logic, and general-knowledge domains. I have reviewed more than 10,000 responses while maintaining a 95%+ acceptance rate on a competitive enterprise platform.

I author RLHF rankings and SFT feedback, identify hallucinations, logical fallacies, and bias, and develop adversarial prompts to test model safety guardrails. I have surfaced more than 50 unique failure modes and consistently ranked among the top contributors for annotation accuracy and throughput.

Founder & Software Engineer Ryndesk.ai

I built and shipped Emma, a production AI receptionist, as the solo developer from system architecture through production deployment. I created the React customer experience for onboarding, dashboards, account management, and service-activity workflows.

I designed the Node.js backend for call webhooks, Google Calendar integration, SMS delivery, and customer interaction workflows. I integrated Ultravox AI for real-time voice conversations, live calendar availability checks, appointment booking, and SMS booking confirmations.

Senior Software Engineer (Contract) Amgen

I worked on an eight-person engineering team delivering production changes across React and Python/Django applications. My work covered user-facing product behavior, frontend feature delivery, and backend authorization improvements.

I supported a major React framework upgrade and strengthened Django authorization by replacing a flat user/admin model with a layered permission structure. I coordinated frontend and backend changes to keep application behavior and access-control rules aligned across releases.

Senior Software Engineer Senpex

I worked on a 10-person full-stack team building a logistics platform supporting food, large packages, and medical supplies. I developed a real-time driver-matching system that scored drivers based on proximity, capacity fit, item size, handling requirements, and current ride load.

I contributed to backend pricing logic, dispatch-dashboard capabilities for monitoring active deliveries, and driver-facing workflows used in field operations. My work supported reliable order assignment and delivery management across varied service scenarios.

Software Engineer Business Warrior

I worked as a backend-focused engineer on an eight-person team building an employer-sponsored loan product. I integrated Plaid and banking APIs to synchronize payroll deductions and loan repayments, including bank re-authentication, connection failures, and interrupted synchronization states.

I built expected-versus-actual payment reconciliation and a three-year vesting and loan-forgiveness engine. I designed lifecycle transitions for active repayment, partial forgiveness, and full forgiveness while preserving accurate and auditable balances through leave, termination, and resignation scenarios.

Software Engineer Datawise Data Engineering LLC

I owned larger frontend and backend features across production web applications and client-facing software projects. I designed API-driven workflows connecting user-facing applications, backend services, third-party systems, and relational databases.

I built data-processing and normalization logic for structured and semi-structured business data, refactored backend workflows, and resolved performance and reliability issues. I also supported production releases, incident investigation, integration fixes, and data-consistency improvements.

Junior Software Engineer Datawise Data Engineering LLC

I contributed to the development and maintenance of web-based, data-driven applications for internal teams and external clients. I built frontend and backend features from requirements while learning architecture, coding standards, testing practices, and release processes from senior engineers.

I developed and consumed REST APIs, worked with relational database queries and updates, investigated defects, and implemented production fixes. I participated in code reviews, deployment preparation, and team discussions while gradually taking ownership of features through release.

Education

Learning history

Marymount California University

Bachelor's Degree, Computer Science

Bachelor's Degree in Computer Science. Located in Rancho Palos Verdes, California.

Azerbaijan State Oil and Industry University (ASOIU)

Bachelor's Degree, Computer Science

Bachelor's Degree in Computer Science. Located in Baku, Azerbaijan.

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