Builder Developer II/III/IV (Senior Agentic Software Engineer)

ECI Software Solutions, Inc.; Mission (KS); Hybrid; USD 150,000 - 190,000; Full time

Job summary

ECI Software Solutions, Inc. is seeking senior Builder Developers to rewrite how enterprise software is built, tested, and operated using AI. They focus on automating workflows, building LangGraph/CrewAI flows, and transforming 20-year ERP systems into AI-driven platforms.

Builders range from Senior to Principal, aiming for deterministic, scalable solutions. The role emphasizes autonomy, evaluation frameworks, and building internal Builder Tools with a 12-month horizon for model capabilities,

Qualifications

• Must be able to design and implement AI-driven agentic workflows.
• Experience building autonomous agents or complex LLM chains that deliver tangible results.
• Comfort with refactoring legacy ERP environments into modern AI-assisted architectures.

Responsibilities

• Build Execution Agents that navigate ERP schemas and identify data discrepancies.
• Automate untestable legacy logic with AI-enhanced tests and docs.
• Perform prompt engineering and evals to move from vibes-based prompts to programmatic instructions.
• Rapid prototyping to convert what-if scenarios into working AI-driven features.

Skills

Agentic Implementation

Systemic Orchestration

Automation Mindset

Autonomous Agents

Tools

Python

SQL

TypeScript

OpenAI/Anthropic

LangChain/LangGraph

dbt

Airflow

Docker

Weights & Biases

OpenTelemetry

Job description

Builder Developer II/III/IV (Senior Agentic Software Engineer)

ECI is hiring senior-level Builder Developers (Senior Agentic Software Engineers) focused on rewriting how enterprise software is built, tested, and operated using AI.

The Mission: Use AI to build autonomous agents and workflows that transform legacy ERP systems into modern, AI-driven platforms. You are not maintaining old code, you are building the future. If you enjoy 4-hour "alignment meetings" and writing Jira tickets for things an agent could do in 3 seconds, you’re going to hate it here.

Builder is not just a title; it is a measure of autonomy, architectural complexity, and "Agentic Leverage." While a traditional "Senior Software Engineer" might be focused on completing tickets, a Builder is focused on automating workflows and owning the execution of AI-driven modules.

Here are the Builder levels we are hiring:

BUILDER 2 (Senior): Focuses on Agentic Implementation. This is the "Engine Room" of the team. They don't just use AI; they build the agents. They can take a legacy module and build a LangGraph or CrewAI flow to modernize it with minimal supervision.

BUILDER 3 (Lead): Focuses on Systemic Orchestration. They design the "Guardrail Layers" and the "Eval Frameworks." They ensure that the agents built by the team are deterministic, cost-effective, and scalable.

BUILDER 4 (Principal/Architect): Focuses on The Meta-Platform. They build the internal "Builder Tools" that the other three levels use. They are looking at the 12-month horizon of model capabilities and ensuring the ERP architecture is ready for "Autonomous Operation."

Core DNA (Shared Foundation)

AI-Native Workflow: Use AI tools to accelerate development, testing, and documentation 10x faster than traditional methods.

Agentic Implementation: Build, debug, and deploy autonomous agents (LangGraph, AutoGen, Playwright-LLM hybrids) that navigate complex ERP schemas and business logic.

Legacy-to-Modern Bridge: Treat 20-year-old legacy systems as puzzles for AI-driven modernization.

Deterministic Mindset: Build for 100% reliability with automated validation, evals, and guardrails.

What You’ll Actually Do

Build Execution Agents: Move beyond RAG into Action. Build agents that can navigate an ERP schema, identify a data discrepancy, and suggest a fix.

Automate the "Untestable": Use AI to wrap legacy business logic in modern unit tests and documentation.

Prompt Engineering & Evals: Use frameworks like DSPy to move from "vibes-based" prompting to programmatic, optimized instructions.

Rapid Prototyping: Turn a "what if" into a working AI-driven feature in days, not months.

The Stack

Python, SQL (Postgres/SQL Server), TypeScript, OpenAI/Anthropic, pgvector/Qdrant, LangChain/LangGraph, dbt, Apache Hop/Airflow, Docker, Weights & Biases, OpenTelemetry. And, any other tool that helps us achieve greatness.

Who You Are

The "Early Adopter" Archetype: You were using GPT-3 before it was cool and had a local Llama running the week it leaked. You spend more time on r/LocalLLaMA, GitHub Trending, and X (AI Twitter) than on LinkedIn.

Agent-First Thinker: You don't think in "functions"; you think in "capabilities." You’ve built at least one autonomous agent or complex LLM chain that actually does something useful.

The "Manual Task" Hater: You have a physical reaction to repetitive work. If you have to do a task twice, you’ve already started drafting the Python script or agentic workflow to automate it.

Technically Fearless: You aren't intimidated by spaghetti legacy code. You see a 20-year-old undocumented ERP module as a goldmine for AI-driven refactoring and modernization.

Rigor over Hype: While you love the latest models, you care about Evals. You know the difference between a "cool demo" and a "production-grade agent" that handles financial data with 100% accuracy.

The Tribe Member: You want to work in an environment where your "AI hacks" and custom automation scripts are celebrated as your greatest contribution, not hidden as "side projects."

Why Join Us?

The "Final Boss" of Complexity: ERPs are the ultimate challenge for AI. If you can automate a General Ledger or a global supply chain, you’ve mastered the hardest problem in software.

Agentic Autonomy: We don't do "tickets." We do missions. You’ll have the freedom to choose the models, frameworks, and agent architectures you believe will win.

The BUILDER Tribe: You won't be the "only AI person" in the room. You’ll be part of a 4-person squad of like-minded enthusiasts who are all obsessed with moving 10x faster.

No Red Tape: If the agent works and the evals pass, we ship. We don't have a "Change Management Committee." We have a "Does It Work?" policy.

The Final Boss: ERP data is the hardest problem in software. If you want an easy life, go build another photo-sharing app. If you want to win the game, let’s go!