How to Hire an MEV Bot Developer: Scope & Red Flags

Q: Should I hire a Solidity developer or a Rust developer to build an MEV bot?

You need both skills (either in one specialized Flashbots searcher developer or a two-person team). The on-chain executor contract must be written in gas-optimized Solidity/Yul (20% of the codebase), while the off-chain mempool monitor, state graph, revm simulator, and builder relay client should be written in Rust (80% of the codebase).

By Merunas Grincalaitis (X · GitHub · DEV · Hashnode · Telegram), Founder & Lead MEV Engineer at MEV DAO — Ethereum smart contract, Flashbots & MEV builder since 2017. Last updated: October 2026.

TL;DR: When you hire an MEV bot developer, you are hiring a low-latency systems and smart-contract engineer who understands Rust (Alloy, revm, Reth), gas-optimized Solidity/Yul, and multi-builder PBS bundle auctions (eth_sendBundle)—not a generic Web3 frontend freelancer. Never hire anyone who offers a "guaranteed daily ROI bot," refuses to demo on a live Foundry Anvil mainnet fork, or asks for your live trading wallet's private key. A legitimate Flashbots searcher developer delivers 100% of the source code to your private GitHub repository under milestone-based acceptance tests.

Part of the Custom MEV Bot Architecture, Arbitrage, Liquidations & Hiring Topic Cluster: Start with our Pillar Guide, Custom MEV Bot Development: What to Know Before You Hire, for the complete architectural blueprint. This guide provides a Technical Interview Rubric, SOW Milestone Template & Freelancer Red-Flag Checklist for evaluating candidates (for pre-hire architecture planning, see our Custom MEV Bot Development Pillar Guide; to engage our team directly, see Hire an Ethereum MEV Bot Developer).

Traders, funds, and DeFi protocols searching to hire an MEV bot developer, a flashbots searcher developer, or a crypto trading bot developer face one of the noisiest markets in crypto. For every real systems engineer who has actually landed bundles on Titan Builder and Beaverbuild, there are fifty Fiverr/Telegram impostors selling copy-pasted 2021 GitHub scripts or outright wallet drainers.

Before you sign a statement of work or wire a deposit, use this hiring checklist to define your technical scope, eliminate impostors in 5 minutes with 7 technical interview questions, and structure milestone acceptance tests that protect your capital.

Architecture diagram of flashbots searcher developer workflow on Ethereum showing Reth / Mempool Feed, State Graph Solver, Solidity Executor, and Builder Bribe Split — Figure 1: End-to-end Ethereum execution pipeline for **flashbots searcher developer** (Reth / Mempool Feed → State Graph Solver → Solidity Executor → Builder Bribe Split).

Freelance impostor vs. General Web3 dev vs. Real Flashbots Searcher Developer

Here is how to tell apart the three types of candidates you will encounter when you hire an MEV bot developer:

Evaluation Criteria	Telegram / Fiverr "Pre-Made Bot" Scammer	General Full-Stack Web3 Developer	Experienced Flashbots Searcher Developer (MEV DAO)
Typical Pitch	"Buy my ready-made AI MEV bot for $1,500—makes 1.5 ETH/day!"	"I built an NFT marketplace in React + Hardhat, I can build an arbitrage bot."	"Let's benchmark your target edge on an Anvil mainnet fork and optimize gas + builder latency."
Core Tech Stack (2026)	Obfuscated Python/JS or malicious Remix contract	TypeScript (`ethers.js`), standard OpenZeppelin Solidity	Rust (`Alloy`, `revm`, `Reth ExEx`) + Yul/Solady executor contracts
Transaction Submission	Public mempool `eth_sendRawTransaction`	Single RPC provider (Alchemy/Infura)	Parallel multi-builder fan-out (Titan, Beaverbuild, Flashbots, Rsync)
Smart Contract Security	Hardcoded backdoor address or unprotected `withdraw()`	Basic `onlyOwner` modifier (`2,100+ gas` overhead per call)	Stateless calldata-driven executor (`msg.sender == address(this)` / transient storage)
Deliverables & Acceptance	ZIP file with no tests	Code that compiles on testnet	Full repo + Anvil historical block replay test suite + bare-metal deployment

For a full breakdown of what each tier of custom engineering costs, read MEV Bot Development Cost: Custom Pricing in 2026 and our service overview on Custom MEV Bot Development: Hire an Ethereum MEV Bot Developer.

7 technical interview questions to ask before you hire an MEV bot developer

You do not need to be a Rust compiler expert to vet a Flashbots searcher developer or dex arbitrage bot developer. Ask the candidate these 7 specific technical questions on a live voice/video call (with screen sharing on):

1. "Why did you choose `alloy` vs. `ethers-rs`, and how do you simulate candidate bundles before sending them to builders?"

What a real MEV developer says: "ethers-rs is deprecated. We use alloy (alloy-primitives and alloy-sol-types compile-time macros) alongside an embedded revm instance backed by a local Reth database (CacheDB). Calling eth_callBundle over HTTP takes 10–40ms, which is too slow for mempool backruns; revm simulates in 100 microseconds." (See Rust MEV Bot in 2026: The Alloy, Reth & Artemis Stack.)
Red flag answer: "We call estimateGas on Infura or send eth_callBundle to Flashbots for every single pool check."

2. "Which Ethereum block builders do you submit bundles to in 2026, and how do you calculate the builder payment?"

What a real MEV developer says: "Submitting only to relay.flashbots.net misses over 80% of Ethereum blocks. We fan bundles out concurrently over persistent HTTP/2 connections to Titan Builder, Beaverbuild, Flashbots, and Rsync, and pay the builder dynamically as a % of net profitInside the executor contract (or via priority fee), so the bundle reverts if net profit is below our threshold."
Red flag answer: "We just use eth_sendRawTransaction with a high gas price."

3. "How do you protect the on-chain executor contract from unauthorized calls if it holds working capital or token approvals?"

What a real MEV developer says: "First, we avoid leaving idle funds in the executor whenever possible by using zero-capital flash swaps (Uniswap V2/V3 flash swaps or Balancer flashLoan). Second, in our Solidity/Yul callback (uniswapV3SwapCallback), we strictly verify msg.sender against the canonical pool address or check a hardwired owner/transient-storage lock so a third party cannot call the callback directly to drain tokens."
Red flag answer: "Anyone can call the swap function, it's fine because it's private." (In 2023–2026, dozens of poorly written MEV contracts were drained within minutes of their first transaction because they left uniswapV3SwapCallback unauthenticated!)

4. "How do you handle `flashbots bundle not included` when your simulation succeeded?"

What a real MEV developer says: "We query flashbots_getBundleStatsV2 to see whether isSimulated was true and isHighPriority was false (meaning a rival searcher outbid our effective bundleGasPrice on the same state slot), or whether the target pending transaction was cancelled/replaced in the mempool." (See Simulate a Flashbots Bundle With eth_callBundle.)

What a real MEV developer says: Opens a terminal, runs anvil --fork-url $ETH_RPC_URL --fork-block-number <block>, and executes a deterministic test showing eth_call / revm profit calculation and exact gas used. (See How to Test an MEV Bot on a Mainnet Fork With Anvil.)

6. "How do you reduce calldata and execution gas in your Solidity executor contract?"

What a real MEV developer says: "Instead of ABI-encoding huge dynamic structs (abi.decode), we pack pool addresses, token directions, and swap amounts into tight byte slices read directly in assembly (calldataload), call IUniswapV2Pair.swap() directly on the pair rather than going through UniswapV2Router02, and use custom revert errors."

7. "Who holds the private keys and where does the production bot run?"

What a real MEV developer says: "You deploy the bot on your own dedicated server (or AWS/Hetzner account that you own), and you generate and load your own .env / hardware keystore keys after auditing the source code. We never see or ask for your live capital keys."

How to structure your Scope of Work (SOW) and milestones

When you hire an MEV bot developer or crypto trading bot developer, never pay 100% upfront. Break the engagement into 3 verifiable engineering milestones:

Milestone 1: Architecture Spec & On-Chain Executor Contract (30%):
- Deliverable: Complete Solidity/Yul smart contract + Foundry unit test suite (forge test -vvvv) proving flash-loan callback security, access control, profit sweep, and gas benchmarks against pinned mainnet fork blocks.
Milestone 2: Off-Chain Searcher Engine & Anvil Replay Backtest (40%):
- Deliverable: Rust (Alloy + revm) or TypeScript searcher engine that ingests pending transactions/blocks, simulates bundles locally, and passes a live replay test against 10+ historical mainnet opportunities.
Milestone 3: Multi-Builder Relay Integration & Server Handover (30%):
- Deliverable: Live deployment on your server, parallel bundle submission to Titan/Beaverbuild/Flashbots, Telegram/Prometheus telemetry alerts, and full documentation.

You can review our own open-source code quality before hiring us by inspecting the mevdao-org GitHub repositories, including mev-arbitrage-and-liquidation-reference and flashbots-bundle-simulator-anvil, and reading 10 Things to Know Before You Hire an MEV Bot Developer.

Frequently asked questions

Where is the safest place to hire an MEV bot developer?

Work directly with an established Ethereum MEV engineering team that publishes verifiable open-source repositories and technical benchmarks—such as MEV DAO Custom Bot Development—rather than anonymous Telegram DM solicitors or unverified Fiverr listings.

Should I hire a Solidity developer or a Rust developer to build an MEV bot?

You need both skills (either in one specialized Flashbots searcher developer or a two-person team). The on-chain executor contract must be written in gas-optimized Solidity/Yul (20% of the codebase), while the off-chain mempool monitor, state graph, revm simulator, and builder relay client should be written in Rust (80% of the codebase).

What are the biggest red flags when interviewing a crypto trading bot developer?

Immediate red flags include: claiming a "guaranteed daily profit percentage," selling a "limited-slot pre-made arbitrage bot," refusing to deliver un-obfuscated source code, failing to explain eth_sendBundle vs. eth_sendRawTransaction, or asking you to deposit ETH into a contract they deployed before you've audited the code.

Do I own the intellectual property and source code when I hire MEV DAO for custom development?

Yes. Every custom bot we build is delivered as clean, documented, un-obfuscated Rust/TypeScript and Solidity source code into your private GitHub repository, with zero recurring licensing fees or profit-sharing cuts.

Can I test MEV DAO's existing bots before commissioning a custom build?

Yes! You can test our production Ethereum Block 0 Sniper Bot, Token Rescue Bot, and Premium Sniping Group right now with a 3-day free trial at mevdao.org/subscribe.

Ready to hire an experienced Ethereum MEV bot developer for a custom arbitrage, liquidation, Uniswap V4, or Polymarket bot—or want to try our live bots first? Message me directly on Telegram (@merunas) to scope your build, or start a 3-day free trial at mevdao.org/subscribe.

About the Author — Merunas Grincalaitis: Merunas is the Founder and Lead MEV Engineer at MEV DAO, an Ethereum smart contract architect and Flashbots searcher who has built production Solidity contracts, Block-0 sniping engines, and whitehat token rescue bundles since 2017 (author of Mastering Ethereum technical tutorials and open-source MEV frameworks). Verify our open-source benchmarks, Foundry Anvil simulation harnesses, and live bundle tooling on GitHub (@merlox), GitHub Org (@mevdao-org), X (@merunasgrincalaitis), DEV Community, and Hashnode, alongside primary protocol specifications at Paradigm Reth Docs and Etherscan Mainnet Explorer. Scoping a custom Rust/Solidity searcher, arbitrage, or liquidation system? Message Merunas directly on Telegram (@merunas) or review our open-source benchmarks on GitHub (@mevdao-org).