Sean Slicer

Software Engineer · TypeScript · .NET · AI-augmented workflows

Software engineer with 4+ years of professional experience building full-stack web applications and APIs across proptech, fintech, and logistics. Currently at Intercontinental Exchange (ICE) working on a RESO-compliant real estate data API — mapping and transforming property records, managing Elasticsearch indexes, and owning CI/CD pipelines in Azure DevOps.

Fluent across the stack: TypeScript, Next.js, and React on the frontend; C#, .NET/ASP.NET Core, and Node.js on the backend. I bring the same rigor to infrastructure — AWS, Azure, Docker, and search systems like Elasticsearch and OpenSearch.

Active practitioner of AI-augmented development: I use Claude Code and structured prompt engineering as part of my daily workflow to cut boilerplate and accelerate iteration on complex features. I also integrate LLMs directly via the Anthropic API and run local inference with llama.cpp.

Outside of work I'm building SoSoc, a full social media platform with a React Native mobile app — custom JWT auth, real-time DMs, and an Expo client sharing the same tRPC API.

Projects

Products, platforms, and prototypes.

SoSoc

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Full social media platform built from scratch: feed with infinite scroll, photo posts, real-time DMs and group chats, notifications, and private accounts with follow-request approval. Rolled custom JWT auth with bcrypt and sliding-window rate limiting on all auth endpoints to block brute-force attempts. Shipped a React Native / Expo mobile app sharing the same tRPC API, with Supabase Realtime for live updates and expo-secure-store for token storage. Developed using agentic coding workflows with Claude Code, maintaining a CLAUDE.md spec to guide AI-assisted feature development. Fully typed with strict TypeScript throughout; tests with Vitest cover rate limiting behavior and Zod validation schemas.

Active development

Next.jsReact NativeTypeScripttRPCSupabasePrismaExpoVitest

Skills

The work Sean is useful for.

TypeScript

.NET / ASP.NET Core

Next.js

React

React Native

Node.js

tRPC

Elasticsearch / OpenSearch

PostgreSQL

Azure / Azure DevOps

AWS

LLM / AI-augmented development

Docker

Prisma

Tailwind CSS

Work with Sean

Selected advisory and build work.

Open to Full-Time Software Engineering Roles

Employment

Full timeRemote

Not actively looking, but open to the right full-time opportunity. Strongest fit in TypeScript/React/Next.js on the frontend and C#/.NET on the backend, with experience across proptech, fintech, and logistics. Remote preferred.

Custom

Experience

Roles Sean has held.

Software Engineer · Intercontinental Exchange (ICE)

Nov 2023 – Present

Work on a RESO-compliant real estate data API that maps and transforms customer property records to conform to MLS industry standards, supporting multiple data partners. Manage Elasticsearch and OpenSearch indexes for mapping configs, user records, and property listings. Built a CI/CD pipeline in Azure DevOps that runs RESO certification tests automatically and syncs mapping files into Elasticsearch on each deployment. Own development of an internal admin tool for user/role management, sample data generation, and service health checks. Use Claude Code and structured prompt engineering as part of daily workflow. Also contributed to Paragon, ICE's flagship MLS platform, on backend C# features during onboarding.

Software Engineer · Cybership

May 2023 – Oct 2023

Built the TypeScript frontend for a 3PL logistics platform using Next.js, tRPC, and Tailwind CSS, connecting independent merchants with fulfillment and inventory management workflows. Implemented data upload and storage pipelines for user accounts and product catalog data. Used LLM-assisted development to prototype UI components and data schemas faster in a fast-moving startup environment. Integrated Zod for schema validation across all user input flows.

Software Engineer · First National Bank of Omaha (FNBO)

Sep 2022 – Aug 2023

Designed an ODS layer that served frequently accessed data without touching the mainframe, cutting query overhead for downstream consumers. Built REST API endpoints used by external credit card partners to retrieve customer account data securely. Researched and documented observability tooling options for application and infrastructure monitoring. Wrote server-side unit tests with JUnit and validated Angular frontend behavior using Selenium.

Software Engineer II · Chris-leef

Mar 2022 – Aug 2022

Built a CMS integrated into the agent portal using Next.js, NextAuth, Prisma, and Tailwind CSS. Led several automation initiatives that reduced manual work and expanded internal tooling capability. Mentored a Business Analyst transitioning into software engineering, covering fundamentals and day-to-day development practices.

Software Engineer · Evental

Jan 2020 – Mar 2022

Set up a CDN using AWS S3, CloudFront, Route 53, and Certificate Manager for global asset delivery with low latency. Built a serverless API on Vercel covering full CRUD for events, sessions, attendees, and users. Handled resource processing and S3 upload pipelines, optimizing for throughput and reliability. Used Zod for schema validation throughout user input flows.

Education

Education.

Centriq Training

Jun 2021 – Dec 2021

Full Stack Development Bootcamp

Focused on ASP.NET, C#, React, and the broader .NET ecosystem. Received a merit scholarship based on prior development experience.