Custom MEV Bot Development: Hire an Ethereum MEV Bot Developer

By Merunas Grincalaitis, founder of MEV DAO and a developer who builds MEV, sniping and trading bots on Ethereum. Last updated: October 2026.

TL;DR: To hire an MEV bot developer, start with a clear strategy and the edge you think you have, check whether an existing tool already does the job, and ask for a scoped plan with simulation and fork testing before anything touches mainnet. Price depends on the strategy, infrastructure and ongoing maintenance, and no honest developer guarantees profit, asks for your main wallet's key, or sends you a contract to fund.

Hiring someone to build a custom MEV bot is one of those decisions that looks simple until you start doing it. The search for "hire MEV bot developer" turns up freelancers, agencies, Telegram contacts and open-source repos, and they all look similar until you dig into what they actually deliver. I've been on both sides of that conversation: building MEV tools for myself and for clients, and turning away people who wanted something that couldn't work.

This article is a practical briefing for anyone considering custom MEV bot development. It covers what "custom" really means, what you should bring to the first call, how a good project is structured, how pricing usually works, and the red flags that mean you're talking to the wrong person. For the hiring checklist in more detail, see what to know before you hire.

What does a custom MEV bot actually mean?

People ask for a custom bot when they mean one of four quite different things:

A strategy that no off-the-shelf tool supports. Unusual contracts, multi-step execution, private order flow, or a niche market.
Their own private codebase. They don't want to share a tool with other traders, or they want to own and extend the code.
A tweak of an existing strategy. A sniper with custom filters, a rescue script for a specific claim-then-transfer flow, or an arbitrage bot that covers a set of pools they know.
"Make me a money printer." This one is a stop. No honest developer can deliver guaranteed profit.

If you're in category 4, stop here and read how MEV bots make money on Ethereum. Most of the value of an MEV opportunity ends up with the block builder through competition on tips. A bot is a way to execute a strategy. It can't invent an edge that isn't there.

Categories 1 to 3 are reasonable. The more specific you can be about which one you mean, the better the quote and the code will be.

What is a good custom bot made of?

A real production MEV bot is more than a swap script. The pieces that usually matter:

Watchers. Mempool listeners, event log watchers, or both, for the contracts and conditions that matter to the strategy.
Simulators. A way to dry-run the trade against current state before you spend gas. Many searchers use libraries like revm for this.
Builders. Transaction construction: gas, nonces, approvals, and, for private execution, Flashbots bundles. See how to send eth_sendBundle.
Risk limits. Max position size, max tip, max slippage, kill switches.
Ops. A place to run it, logging, alerting, and a way to stop it fast when something looks wrong.

If a developer talks only about "the buy" and never about simulation, tips or kill switches, push them. Those are the parts that decide whether the bot survives contact with mainnet.

What should you bring to the first conversation?

The quality of a custom build is limited by the quality of the brief. Come with:

The strategy in plain language. What does the bot watch for, and what does it do when it sees it?
Target contracts and chain. Router, pool, lending market, or prediction-market addresses. Ethereum mainnet is different from a L2, and the gas economics are different again.
Execution constraints. Does it need to land in the same block? Stay out of the public mempool? Bundle several actions atomically?
Risk rules. Maximum size per trade, stop conditions, what happens when a simulation fails.
Where it will run. Your server, a VPS, or a managed environment.
Success criteria. How will you know the job is done? A working fork test? A live trade of a certain size?

I refuse to quote a price until those are clear. A vague "build me an arbitrage bot" can mean anything from a weekend script to a multi-venue system with its own simulation stack.

How should a custom bot project be structured?

Every engagement is different, but the ones that go well share a shape:

Scoping. Agree what will be built, what won't, and how you'll test it.
Build. Write the watchers, builders and risk limits against the agreed contracts.
Fork testing. Run the bot against a mainnet fork with Anvil so it can hit real contract state without risking funds. Impersonate whales, set balances, and replay real opportunities.
Small live launch. Deploy with limited capital and watch it for a while.
Handover. You get the code, the runbooks and a clear picture of what still needs ops attention.

Fork testing is non-negotiable for me. A bot that only works in a unit test against mocked contracts is not ready for mainnet. Foundry's Anvil is the usual tool for this.

How much does custom MEV bot work cost?

There's no single market rate, because the work ranges from a small tweak to a full searcher stack. What drives the quote:

Number of venues and contracts. One Uniswap v2 pair is cheap. Multi-hop, multi-DEX, with liquidations or CEX legs, is not.
Latency requirements. A next-block bot is a different project from a same-block, tip-competitive searcher.
Simulation depth. Simple eth_call checks vs a full local EVM with state overrides.
Ops and handover. Code-only vs help running it for the first weeks.
Support window. Bugs in the first month are normal; decide who's responsible.

Be suspicious of fixed prices quoted before the strategy is understood. Be equally suspicious of open-ended retainers with no milestones. A good quote lists deliverables and a test plan.

If what you need is already covered by an existing tool, a custom build is the expensive way to get it. For same-block sniping, wallet rescue or a sniping community, an off-the-shelf product is usually enough. Go custom when your logic is genuinely unique.

What are the red flags when you hire an MEV bot developer?

I've written about this before, and the pattern hasn't changed. Walk away if you see:

Guaranteed returns. MEV is competitive. Anyone promising a fixed monthly profit is either lying or describing a different business.
No fork testing. If they won't test against mainnet state before going live, the first real trade is the test.
Pressure to send funds to an unknown contract. SentinelOne has documented drainers that pose as trading bots. Never fund a contract you haven't verified.
Vague ownership of the code. Clarify who owns the repository and whether you can take it with you.
No risk discussion. A developer who never mentions tips, reverts, sandwiching or key security is selling a demo, not a bot.

Which strategies do people usually commission?

These are the ones I see most often, with a link to background reading for each:

Arbitrage, especially long-tail and multi-hop, where competition is thinner. See how to build a profitable MEV arbitrage bot.
Liquidations on lending protocols like Aave. Hard to win, but well-defined. See how liquidation bots work on Aave.
Sniping with custom filters, multi-step launches or v4 hooks. See how Ethereum sniper bots work.
Wallet rescue and security tooling for unusual claim or unstake flows. See rescuing tokens from a compromised wallet.
Prediction-market bots. I've written about what worked and what didn't in Polymarket trading bot strategies.

Frequently asked questions

What is custom MEV bot development?

It's building a bot written for your specific strategy, contracts and risk rules, instead of using a shared tool. It includes watching, simulation, execution (often through Flashbots bundles), and the ops around it.

How do I hire an MEV bot developer without getting scammed?

Ask for a clear scope, fork-test plan and ownership of the code. Refuse guaranteed returns, refuse to send funds to unknown contracts, and check that the person can explain tips, reverts and key security.

How much does a custom MEV bot cost?

It depends on scope. A small sniper tweak and a multi-venue arbitrage system are different jobs. Expect a quote only after you've described the strategy, contracts, chain and success criteria.

Will a custom bot be profitable?

Nobody can promise that. A bot executes your strategy quickly and reliably. Profit depends on the edge, competition, gas and tips.

How should the bot be tested?

Against a mainnet fork (for example with Anvil), replaying real opportunities, before any live capital. Then launch small.

Do I always need a custom build?

No. If an existing sniper, rescue tool or trading bot already covers your case, use that first. Commission custom work when your logic is unique or you need a private codebase.

Related guides

I build custom MEV, sniping and trading bots, and I also maintain the MEVDAO tools. If you have a strategy brief and want to talk it through, message me on Telegram. If you only need a ready-made sniper, rescue tool or sniping group, start a 3-day free trial.