Sr FullStack Founding Engineer

Covenant Consulting; Kansas City (MO); Hybrid; USD 150,000 - 200,000; Full time

Job summary

Covenant Consulting is seeking a Sr. Full-Stack Founding Engineer to help build an AI-powered platform with direct collaboration to the CTO. You will own features across the stack, make architectural decisions, ship them, and iterate as the product scales.

This role emphasizes ownership, fast execution, and a hands-on approach in a company building modern software for infrastructure projects. Hybrid work with in-office preference in Kansas City, MO is offered.

Qualifications

• 4+ years building production SaaS.
• Full-stack TypeScript across frontend and backend.
• Frontend craft: React/Next.js with TypeScript.
• Python web services for data pipelines/AI.
• LLM integration shipped in production.
• Third-party API integrations with reliability.
• Strong Postgres skills including RLS, views, optimization.
• Data management and validation across systems.
• Early/founding engineer experience.

Responsibilities

• Design, build, and ship full-stack features across frontend, backend, and data layers.
• Own auth, multi-tenancy, billing, and deployment end-to-end.
• Integrate AI workloads using LLMs in real product workflows.
• Wire up enterprise APIs with robust error handling.
• Collaborate with CTO and early team to set technical direction.

Skills

Production SaaS experience

Full-stack TS

React/Next.js UI

Python web services

LLM integration

API integration

PostgreSQL expertise

Data analysis

Founding engineer

Open-stack orientation

Tools

Next.js

PostgreSQL

React

FastAPI

Python

Supabase

Deno

Cloud tooling

Job description

Title: Sr. Full-Stack Founding Engineer — AI Platform

Department: Technology / Software

Location: Kansas City, MO — Crossroads Arts District (preference in-office with flex to work from home as needed)

Type: Direct Hire / Perm

Status: US Citizen / Green Card Permanent Resident /W2 Exempt - Unable to Sponsor or work C2C

Salary: $150K–$200K (some flex, based on talent)

Reports To: Chief Technology Officer

SUMMARY

Our client is a sixth-generation, family-owned heavy/civil contractor based in Kansas City, in business since 1880. They have built 845+ bridges and placed 3,500+ lane miles of pavement across the Midwest and is currently behind some of the region's largest infrastructure projects. Underneath that 145-year track record, our client is investing in modern technology — including a new AI-powered software platform meant to bring everyone on a complex project (contractors, craftsmen and field supervisors, estimators, architects, mechanical and electrical engineers, quality control, and project management) together on one system.

As a Sr. Full-Stack Founding Engineer, you will help build this platform from an early stage, working directly with the CTO. This is a high-ownership, full-stack role — you own features across the entire stack, make real architecture decisions, ship them, and keep improving on the results. This is not a maintenance role on someone else's system; it is a builder's seat inside a company that builds physical infrastructure and is now investing seriously in software and AI.

RESPONSIBILITIES

Build & Own the Stack

• Design, build, and ship full-stack features across frontend, backend, and data layers.
• Own systems end-to-end — auth, multi-tenancy, billing, and deployment — as connected concerns, not isolated tickets.
• Make pragmatic architecture decisions early, ship them, and refine as the product and requirements evolve.

AI & Data

• Build and maintain Python services that power data pipelines and AI workloads.
• Integrate LLMs (Claude / Anthropic and others) into real product workflows — not demos.
• Apply sound data modeling and query design in Postgres to keep the platform fast and reliable as it scales.

Integration & Reliability

• Wire up third-party and enterprise APIs, handling authentication, rate limits, and pagination.
• Build systems that recover gracefully when upstream services misbehave.

Team & Culture

• Collaborate directly with the CTO and early team to set technical direction.
• Contribute to a fast-moving, low-process culture that values ownership, directness, and judgment.

REQUIREMENTS

• 4+ years building production SaaS — you have owned auth, multi-tenancy, billing, and deployment as a system, not as someone else's problem.
• Full-stack TypeScript — comfortable across the frontend and backend; our stack is Next.js with a modern Postgres-backed backend-as-a-service layer (Supabase/Deno).
• Front-end craft — as a founding engineer you own UI design decisions and build clean, functional user-facing features in React / Next.js and TypeScript.
• Python web service experience — FastAPI, Flask, Django, or similar; we run Python services for data pipelines and AI workloads.
• LLM integration experience — you have shipped a real product feature using an AI model (Claude, GPT, or similar) in a production workflow.
• Third-party integration experience — you have wired up enterprise APIs, handled rate limits, and recovered gracefully when upstream services misbehave.
• Strong Postgres — row-level security, views, and query optimization; not just ORM-level familiarity.
• Data management & analysis — comfortable working with data across systems, validating it, and analyzing it to make sure it's accurate and usable, not just stored.
• Early / founding engineer background — you have built in a small-team environment before and know how to make a decision, ship it, and fix it if it's wrong.
• Open-stack orientation — modern web/cloud tooling; this is not a Java or .NET shop
• Cultural fit — ownership, directness, and the ability to move fast without heavy process.

NICE TO HAVE

• Direct experience with Claude / Anthropic models.
• Experience with Supabase and Deno Edge Functions specifically.
• E-commerce or marketplace platform experience (catalog, cart, checkout, payments, order lifecycle).
• Construction tech, field-operations software, or other complex multi-stakeholder platform experience.

WHY THIS ROLE

• Real ownership on a platform being built from the ground up, backed by an established, financially stable company.
• Work directly with a CTO who brings 20+ years of SaaS leadership experience.
• Fast-moving hiring process; compensation is open for the right person.

Compensation: $150,000-$200,000 per year