Agentic AI Multi-Agent LangGraph

Agentic AI Workflow Engine

Multi-agent workflow engine with Planner, Research, Coder, and Tester agents collaborating autonomously via LangGraph DAG — completing 156 complex software development workflows with 94% first-pass success rate and 5x developer velocity for a 40-engineer dev shop in Portland, OR.

Delivered & In Daily Use
Workflow Agents History
Running
Planner Agent Thinking...
Research
Coder
Tester
156 Tasks Done
3.2s Avg Turn
94% Success
 Workflow dashboard — client data anonymized for display
156 Workflows Completed
94% Success Rate
3.2s Avg Agent Turn
5x Dev Velocity Boost

Before & After

Before Rivan.ai
Code review turnaround 3 days
Bug investigation 6 hr avg
Routine coding tasks 2 hr
Developer velocity 1x
Monthly dev hours saved 0
After Rivan.ai
Code review turnaround 4 hours
Bug investigation 45 min
Routine coding tasks 25 min
Developer velocity 5x
Monthly dev hours saved 480 hours

The Challenge

NovaByte, a 40-engineer dev shop based in Portland, OR, was bottlenecked across every stage of their development pipeline. Code reviews took an average of 3 days to turn around. Bug investigation was entirely manual — senior engineers spent 6 hours on average tracing issues through a sprawling microservices codebase. Repetitive coding tasks like boilerplate generation, refactoring, and test writing ate directly into time that should have gone toward feature work.

Their VP of Engineering had evaluated autocomplete tools and copilot-style assistants, but none of them moved the needle. She needed AI that actually does work — not just suggests it. Something that could take a Jira ticket, understand the codebase, write the code, and validate it, end to end.

Our Solution

We built a multi-agent workflow engine where four specialized AI agents collaborate on complex software development tasks via a LangGraph-powered DAG. A Planner agent decomposes incoming tasks, delegates to Research, Coder, and Tester sub-agents, and orchestrates the full workflow autonomously — from Jira ticket to tested pull request, with human-in-the-loop checkpoints at critical stages.

Planner Agent

Decomposes complex tasks into sub-tasks, assigns to specialized agents, manages execution order, and handles retries and escalation.

Research Agent

Searches the codebase, reads documentation, gathers context from PRs and issues, and builds a knowledge brief before any code changes.

Coder Agent

Writes, edits, and refactors code following project conventions with full file system access and awareness of the team's style guide.

Tester Agent

Runs existing tests, validates changes against regressions, generates new test cases, and reports coverage deltas to the Planner.

Workflow DAG

Directed acyclic graph execution with parallel branches, conditional logic, retry policies, and human-in-the-loop approval gates.

Memory System

Persistent memory across sessions that learns codebase conventions, stores lessons from past workflows, and adapts agent behavior over time.

Tech Stack

Built with cutting-edge AI orchestration infrastructure, deployed on the client's infrastructure with full data sovereignty and CI/CD integration.

Python LangGraph Claude API GPT-4 MCP FastAPI Redis PostgreSQL Docker GitHub Actions

Project Timeline

Jul 2024
Agent Design & Architecture
Defined agent roles, tool access boundaries, communication protocols, and success criteria. Mapped NovaByte's codebase conventions and workflow patterns to inform agent behavior.
Aug 2024
Orchestration Engine
Built the LangGraph-powered DAG engine with parallel execution, conditional branching, error handling, retry policies, and human-in-the-loop checkpoints at critical workflow stages.
Sep 2024
Integration & Tooling
Connected agents to MCP servers, GitHub repositories, Jira, CI/CD pipelines, and monitoring tools. Built the persistent memory system and codebase knowledge graph.
Oct 2024
Evaluation & Hardening
Ran 200+ test workflows across real NovaByte tickets. Iterated on agent prompts, tool schemas, and DAG topology. Achieved 94% first-pass success rate across all workflow categories.
Nov 2024
Final Delivery & Handover
Production deployment, team training for all 40 engineers, comprehensive documentation and runbooks. Delivered monitoring dashboard and 30-day post-launch support.

Client Feedback

I've been managing engineering teams for 12 years and I've seen every productivity tool under the sun. Most of them are glorified autocomplete. This is different. I watched the planner agent take a Jira ticket, break it into subtasks, have the research agent scan our entire codebase for context, send the spec to the coder agent, and pass the output to the tester — all in about 40 seconds. My senior devs were speechless. We're not replacing engineers — we're giving each one a team of AI assistants that actually understand our codebase. Routine PR turnaround went from 3 days to 4 hours. That alone is worth every penny.

AP
Aisha Patel VP of Engineering, NovaByte — Portland, OR

Project Verification

Upwork Contract Fixed-Price Project
Completed
Contract Title Agentic AI Workflow Engine
Client Location Portland, OR, USA
Budget $68,000
Duration Jul — Nov 2024
5.0
"Built something I genuinely thought was 2-3 years away from being possible. Our team uses it every single day."
Project Completion Summary Verified delivery milestones
Delivered On November 22, 2024
Project Duration 5 months
Milestones Hit 10 / 10
Sprints Completed 8 sprints
Post-Launch Issues 0 critical
ROI Timeline Immediate (480 dev hrs/mo saved)
Payment Verified Top Rated Plus Dev Tools Client

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