Roman – AWS, React, Typescript

It's a WhatsApp-based MVP/pilot that lets users log trips, receive personalized telemetry, and automatically generate emissions reports.

• Bootstrapped the back-end foundation in Nest.js with a REST API and defined the initial solution architecture for an MVP-stage product.
• Implemented an end-user WhatsApp-based workflow for station availability checks, nearest station selection, fuel amount input, and user-facing flows.
• Designed telemetry ingestion and the data model for companies and trucks, and implemented integration-based imports in an early-stage setup.
• Built a custom data uploader for non-automated telemetry sources using table-based and manual uploads.
• Implemented orchestration for emissions calculations with S3 uploads, persistence in PostgreSQL, and triggering of calculation pipelines.
• Wrapped and operationalized a mathematician-authored emissions algorithm via Python Lambda functions.
• Prepared reporting datasets and exports for AWS QuickSight.
• Delivered the MVP to a small pilot and handed it over to a broader team for further scaling.

It's a multi-tenant AI career advisor platform for colleges, supporting students' onboarding, staff workspaces, role-based access, AI-assisted conversations, scheduled analysis, and progress extraction.

• Delivered the product from zero to a production MVP, supported post-MVP work, and gradually transitioned ownership to a team.
• Built a multi-tenant platform model with workspaces, spaces, and layered RBAC.
• Implemented bulk student invitations with queued delivery for large cohorts and automated invitation emails and onboarding flows.
• Implemented authentication evolution from AWS Cognito to custom authentication due to changing requirements.
• Integrated Microsoft login for staff and implemented one-time link and OTP login flows for students.
• Built chat-centric onboarding and data capture with scheduled AI analysis and chat summaries and progress extraction.
• Implemented an internal AI flow and orchestration builder with tool configuration, recursive logic, multi-provider setup, and web search integration.
• Implemented task management workflows with staff-driven and AI-initiated status transitions.
• Implemented safeguarding detection and escalation with restricted visibility and role-based notifications.
• Implemented notifications via Twilio SMS and migrated email delivery from SendGrid to Postmark.
• Implemented observability with CloudWatch logging and an internal alert module.
• Managed infrastructure as code via AWS CDK and CI/CD via GitLab pipelines, with chat storage in Cassandra and AWS Keyspaces.

It's a HIPAA-compliant healthtech platform built on a self-hosted Medplum instance, with AI middleware for patient intake, provider workflows, clinical data orchestration, scheduling, access control, and healthcare integrations.

• Conducted product discovery and delivered MVP foundations.
• Replaced the default GitHub deployment with a custom GitLab CI/CD pipeline enabling multi-service deployments, environment promotion, and expanded infrastructure footprint.
• Built a patient-facing web app in Next.js and integrated end-to-end patient flows with Medplum-backed capabilities.
• Built a provider-facing portal for patient lookup, visit context, and operational clinical views.
• Designed and implemented a SOAP note workflow that converted structured SOAP UI into FHIR-aligned, dynamically generated resources.
• Implemented intake and questionnaire-driven flows for questionnaire authoring, response capture, and downstream resource creation.
• Delivered a chronological records timeline aggregating key clinical artifacts into a coherent patient history.
• Implemented availability and scheduling primitives to support visit coordination.
• Implemented an AI middleware gateway approach, including deployment bootstrapping, Nest.js-based auth, and Medplum client credential configuration.
• Added 2FA and SMS verification flows and extended the backend to support custom verification beyond standard MFA.
• Owned access control and multi-tenancy considerations across architecture and delivery.
• Integrated Health Gorilla, Zoom API, and Claim.MD.
• Implemented messaging via AWS SES and AWS-based SMS integration, with infrastructure managed via AWS CDK.

It's an e-commerce and fulfillment platform that enables users to create and sell merch collections with automated DTG production, order routing, shipping workflows, supplier integrations, and internal operational tooling.

• Owned key domains including shipping, fulfillment, and print automation, and worked full-stack across the platform.
• Led automation integration with Kornit Digital DTG equipment through Custom Gateway and later custom integrations.
• Coordinated with factory operations, accessed machine-connected systems, and automated workflows based on direct validation with operators.
• Implemented generation of print job and artwork instruction files with placement zones, palettes, and job parameters required by DTG pipelines.
• Built and maintained the end-to-end fulfillment lifecycle from purchase through job creation, print start, shipping label creation, and tracking updates.
• Migrated and rewired shipping workflows around ShipStation, separating production and fulfillment modules from customer-facing shipment tracking.
• Contributed to multiple platform iterations and major refactors and architecture changes.
• Implemented a final architecture based on Nest.js microservices, Kafka, Redis, Event Sourcing, and PostgreSQL projections.
• Used Cassandra-compatible ScyllaDB for internal system needs while keeping the primary user read model in PostgreSQL.
• Built complex product modeling with supplier, retail, and e-commerce projections optimized for denormalized read models.

It's a CRM and e-commerce platform delivering marketing and sales workflow support.

• Delivered multiple performance- and marketing-oriented e-commerce implementations, including funnels, upsells, and recurring charges.
• Implemented integrations with Konnektive CRM for sales flows, upsell logic, and recurring billing operations.
• Served as Frontend Lead on a large client project for CRM and e-commerce platform delivery.
• Implemented core CRM front-end modules for orders, subscriptions, customers, products, campaigns, and funnels, shipping and fulfillment UI, and analytics.
• Implemented shipping and order tracking workflows and supported real-time UI needs, including websockets where required.
• Built a page builder inside the CRM with dynamic templates and block loading, page composition, and rendering.
• Maintained a custom front-end build approach with CRA ejection and custom webpack configuration.
• Participated in back-end work with PHP and Symfony and collaborated closely with the back-end team.

Small-business websites and lightweight custom admin tools delivered end-to-end.

• Built small-business websites with custom back-office capabilities for multiple domains including automotive, furniture, tools catalog, and real estate.
• Implemented product and catalog management with CRUD, pricing updates, admin dashboards, and inquiry workflows.
• Built custom search and filtering for listings, including homepage prioritization logic.
• Implemented lead capture and communications via contact forms and inquiry flows.
• Owned end-to-end delivery including development, hosting setup, deployment, and basic operational maintenance.