Freelance Backend Engineers in HoustonFreelance Backend Engineers in Houston
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Al Kaizar Sappayani's avatar
Al Kaizar Sappayani
Houston, USA
AI Engineer(AI Agents, LLM Apps, Chatbots, RAG)
AI Engineer(AI Agents, LLM Apps, Chatbots, RAG)
Cover image for AI - powered insurance Agent Problem: Prior auth was manual—...
AI - powered insurance Agent Problem: Prior auth was manual—staff reviewed patient docs to predict approvals, making the process slow and resource-heavy. Solution: Built a HIPAA-compliant AI auth system: extract clinical data (OCR + clinical NLP), form a structured EHR-like record, evaluate insurer rules, and generate approval suggestions; added voice input workflows via STT/TTS plus secure storage and audit logging. Metrics: Reduced turnaround time and improved SLA adherence (similar projects reached ~98%). Result: Automated major parts of auth decisioning while staying compliant and auditable. Skills: AI Speech-to-Text AI Agent Development AI Builder AI Audio Generation AI Security
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Cover image for Marketing Assistant Bot As part of
Marketing Assistant Bot As part of my work in AI-driven automation, I built a Marketing Assistant Bot using Relevance AI to address a major challenge in customer engagement: inefficient lead handling and inconsistent follow-ups. Businesses often struggle with manually qualifying leads, responding to competitor comparisons, and guiding potential customers through the sales funnel. The lack of automation resulted in lost opportunities, delayed responses, and high drop-off rates. To solve this, I developed an assistant on Relevance AI
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Cover image for AI Sales Agent Problem: Customers needed fast, accurate answ...
AI Sales Agent Problem: Customers needed fast, accurate answers on courses/licensing/policies from a huge, changing catalog; support handled repetitive questions and compliance is state-specific. Solution: Built RUBI, an embedded RAG purchase advisor in using ETL + multimodal indexing and hybrid retrieval (metadata + vector + structured lookups) with cited, grounded answers, purchase flows, analytics, and tuning loops. Metrics: 695,042 conversations; 2.6 Qs/convo; feedback 6% up / 94% down; ~10s to first token, ~11s complete; KB >100k structured rows.
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Cover image for AI Generated Data Analysis Problem: Weekly call-center ops d...
AI Generated Data Analysis Problem: Weekly call-center ops data needed actionable synthesis; manual analysis was slow and inconsistent. Solution: Built an LLM data analysis agent: ingest call data, run NLP + aggregations, detect anomalies, and generate a weekly executive PDF with insights, metrics, and recommended actions Metrics Automated weekly PDF; similar setups cut analysis time ~90% and improved decision turnaround (one related client saw 17% revenue lift over 7 months) Tech: Python ETL, Pandas, NLP, GPT-4o, Airflow Result: Consistent reports that surface issues fast and drive quicker corrective action.
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Backend Engineer(1)
Adeleke David's avatar
Adeleke David
Houston, USA
Full-Stack Developer building modern web applications and AI
New to Contra
Full-Stack Developer building modern web applications and AI
Cover image for Legacies is a genealogy platform
Legacies is a genealogy platform designed to help people explore, organize, and connect their family histories. The project focuses on making African family history easier to document and navigate. Users can begin with information such as a family name, compound, village, Local Government Area, or state and use that information to build a structured family history. The platform is designed around family trees and shared ancestry, with the goal of helping people discover connections between relatives and preserve information that might otherwise be lost across generations. I built the application as a full-stack project, working across the frontend and backend. The backend uses Node.js and Express, with PostgreSQL for storing and organizing family data. Key areas of the project include: Family and ancestry data organization Family tree exploration Location-based family information Shared-ancestor and family connections Backend APIs and data management PostgreSQL database integration Full-stack web application development Technologies: Node.js, Express.js, PostgreSQL, JavaScript, HTML, CSS, REST APIs
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Cover image for Ria Braids Studio — Luxury
Ria Braids Studio — Luxury Brand Website A fully responsive, motion-designed website built for Ria Braids Studio, a braiding salon serving Royse City and Dallas, Texas. The brief called for a luxury aesthetic that matched the brand's existing visual identity — warm rose, coral, and gold tones extracted directly from the client's logo and marketing materials. Key features: Fixed glassmorphism navigation with mobile hamburger menu, animated hero section with twinkling star field and rotating SVG badge, scroll-triggered reveal animations throughout, service cards with hover micro-interactions, three-tier pricing layout, a step-by-step booking flow, and a contact form that pre-populates and opens WhatsApp for instant client communication. Design approach: Paired Cormorant Garamond (luxury display) with DM Sans (clean body copy) to balance old-world elegance with modern readability. Custom SVG braid-pattern dividers echo the brand's craft. All motion respects prefers-reduced-motion for accessibility. Tech: Vanilla HTML, CSS, JavaScript — no frameworks, no dependencies. Fully self-contained single file.
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Cover image for DrGreenClub — E-commerce & Membership
DrGreenClub — E-commerce & Membership Website Designed and developed a responsive e-commerce and membership website for DrGreenClub, a Canadian cannabis brand. I built the site with Next.js, React, TypeScript, and Tailwind CSS, focusing on a modern, responsive experience across desktop and mobile. The project includes custom navigation, membership plans, product collections, retail and wholesale sections, subscription-focused pages, responsive layouts, animations, and third-party form integration. I handled the frontend implementation, page architecture, UI development, responsive behavior, and deployment-ready setup, turning the brand's requirements and visual direction into a functional web experience.
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Cover image for Designed and developed a full
Designed and developed a full single-page marketing website for Elite Barbers, a 4.9-star rated barbershop located in Bloomsbury, London. The site was built from scratch with a premium dark-and-gold aesthetic to match the brand's upscale positioning. What was delivered: Custom HTML/CSS single-page website — no templates, no frameworks Responsive layout optimised for desktop and mobile Embedded real customer photos (shopfront, haircut gallery) Google Reviews integration (ratings, quotes, star display) Full services section covering all 9 offered treatments Location section with address, hours, phone number, and Google Maps link Fixed navigation with smooth scroll and a call-to-action button Performance-optimised with all images embedded inline (no external dependencies) Tech Stack: HTML5, CSS3 (custom properties, grid, flexbox), Google Fonts Industry: Local Business / Grooming & Wellness Location: London, UK (Remote)
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Backend Engineer(1)
morgan carr's avatar
morgan carr
Houston, USA
Helping businesses automate workflows with APIs and AI
New to Contra
Helping businesses automate workflows with APIs and AI
Cover image for Shopify B2B Pack-Unit Normalization App Development
Shopify B2B Pack-Unit Normalization App Development
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Cover image for AI Workflow Reliability - public-safe
AI Workflow Reliability - public-safe automation first-slice snapshot. I build AI workflow prototypes where Claude, OpenAI, n8n, Make, and API handoffs are one part of a traceable system, not the source of truth. The first slice maps inputs, the model step, validation rules, fallback/review routing, and operator-readable handoff notes. Useful for: API/webhook automation with messy inputs n8n, Make, or Zapier reliability cleanup LLM outputs that need schema checks and audit trails small discovery milestones before a larger build Public-safe note: this is a portfolio snapshot of my delivery approach, not a private client screenshot.
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Cover image for PackBridge - Shopify B2B pack-unit
PackBridge - Shopify B2B pack-unit normalization app. Public repo: https://github.com/morgan-coded/packbridge This project shows API/webhook reliability work: merchant-defined pack-unit rules, CSV rule import, Prisma/PostgreSQL persistence, Shopify webhooks, HMAC-signed outbound delivery, and job-level audit history for clean handoffs.
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Cover image for Script Sentinel - Shopify Plus
Script Sentinel - Shopify Plus migration-risk audit app. Public repo: https://github.com/morgan-coded/script-sentinel This project shows the Shopify audit lane: merchant-paste script intake, deterministic Ruby-source classification, privacy-scrubbed fixtures, PDF audit reports, regression/parity surfaces, and honest migration-risk reporting for Scripts-to-Functions work.
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Backend Engineer(1)