On-chain engineering
Build smart contracts for your token, DeFi protocol or on-chain product.
Our implementation scope separates engineering, security review and launch responsibilities. Plan blockchain solutions around the rules your users need to verify, with a clear handoff before mainnet.
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Compare these product requirements with your intended on-chain flows. GridTradeX demonstrates game logic. PumpTap and Ludo show supporting wallet and data infrastructure. The surrounding application connects smart contracts to wallets, interfaces and off-chain services. Confirm how integration of blockchain data and external services affects the implementation scope.
PumpTap worked with Pharos Production on a multi-chain wallet for storing, sending and managing digital assets. Its event-driven infrastructure supports transaction tracking and connections to decentralized applications. For smart contracts accessed through a wallet, scope transaction submission, status updates and user-facing failures separately from the on-chain rules.
Ludo worked with Pharos Production on a cross-chain reputation platform that processes blockchain events and generates soulbound NFT-based reputation scores. Web, browser and Telegram interfaces connect users to reputation data and APIs. This case shows the data infrastructure that can surround smart contracts. The public audit reference below identifies the reviewed NFT minter scope.
Pharos Production engineered Ludera's compliance operations platform for crypto exchanges. It connects provider checks and AI-assisted document review to configurable risk scoring, human approval and recurring asset oversight.
Pharos Production partnered with Grid Trade X on a crypto prediction game combining price feeds, betting rounds and smart contracts. The case describes an AWS-based event-driven stack and on-chain transparency. Compare its product flows and integration requirements with the smart contracts you intend to build.
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The value of on-chain rules depends on a real need for shared verification. The network can make asset transfers independently verifiable, but placing contracts on a blockchain also introduces fees, wallet requirements and operational constraints.
A traditional contract records obligations in legal language. For an on-chain workflow, identify which contract terms can become executable rules and which still need legal interpretation or human judgment. Code does not resolve those questions for you.
Use this checklist to agree the handoff for smart contracts in your statement of work. Before implementation starts, identify the included deliverables, optional platform work and third-party responsibilities.
Define smart contract logic, actors, asset flows and permissions in the specification and threat model. Document contract functions and interactions with other contracts, including failure scenarios. These decisions guide smart contract creation and give the client a specification to approve.
Specify repository access, dependencies and build instructions. The handoff also requires unit tests and financial invariants that another developer can run from the agreed source version.
Agree the internal review report, external-auditor handoff and remediation responsibilities for the agreed repository. Keep release evidence tied to the version the auditor reviewed.
Include the agreed deployment scripts, addresses, upgrade procedures and admin-key custody for the agreed release. Define the support boundary and the evidence required for the release.
Our smart contract services can be scoped around an individual on-chain module or the application that uses it. Agree the asset flows, interfaces and acceptance criteria before selecting an implementation approach.
When selecting a DeFi smart contract development company, ask how lending, staking or exchange rules become testable invariants. Define oracle dependencies, liquidation behavior and emergency permissions before implementation.
An NFT smart contract development company should document minting permissions, metadata control and transfer restrictions. For these crypto smart contracts, specify issuance limits and how marketplace integrations will be tested.
Include wallet approvals, transaction status and failed-operation handling in smart contract application development. Define which functions belong on-chain and which require backend or interface work.
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Choose a chain your users can work with and a build the client can reproduce.
Match the network to your users, transaction workload and trust assumptions. Compare various blockchain platforms by wallet support, fees and the operational requirements of your release.
On this network, EVM bytecode defines the executable rules. Other networks need their own compatibility and integration checks.
For EVM-based smart contracts, source written in languages such as Solidity compiles to bytecode executed by the Ethereum Virtual Machine. The compiler version belongs in the delivery specification. A developer evaluating programming languages like Solidity should also review the available testing libraries and the team's relevant implementation work.
Agree the development environment before implementation. Record dependency versions and build commands so the client can reproduce the test results. On the selected blockchain network, rehearse user flows before mainnet approval. Experience on one chain does not establish readiness for specific blockchain platforms. When assessing BSC, historically called Binance Smart Chain, confirm the current network configuration and wallet integrations.
Choose a smart contract blockchain by its execution model, wallet support and operational constraints. A smart contract platform must fit the intended users and the evidence required for release.
Solidity smart contract development should pin compiler settings and dependency versions. Identify the Ethereum code to be reviewed and deployed, including its target EVM version. Smart contracts Ethereum teams deploy need tests against the dependencies they will actually call.
Solidity smart contracts can run on Polygon's EVM-compatible chain. Confirm network configuration, wallet behavior and external dependencies for the chosen deployment; compatibility alone does not verify the complete application.
Smart contracts on Bitcoin express spending conditions through its transaction and scripting model. Confirm the required signing and time-lock rules before comparing this approach with an EVM implementation.
If an existing brief refers to IBM Blockchain, confirm the actual ledger, deployment model and support responsibilities. For a permissioned network, establish participant identity and who may validate or view each transaction.
Choose the closest starting point for your smart contracts. A simple contract with bounded rules needs a different scope from an interacting suite. The estimate follows a review of the specification, integrations and testing requirements. These options are not fixed-price packages.
| Starting point | Work to scope | Inputs for an estimate | Budget and timing |
|---|---|---|---|
| Token or contract module | A defined token, vesting, escrow or other bounded contract component. | Rules, roles, target chain and integration points. | Quoted after reviewing the specification and testing requirements. |
| Smart contract suite | Interacting smart contracts with shared permissions, tests and deployment dependencies. | Architecture, economic rules, existing code and audit expectations. | Build and review milestones scoped together; auditor scheduling identified separately. |
| DeFi protocol | Financial rules implemented in smart contracts, with protocol-specific risks and integrations. | Economic model, asset flows, oracle assumptions and operational controls. | Contract work separated from frontend, backend and other platform development. |
| Existing-code review and remediation | Review of an existing repository and agreed implementation of fixes. | Repository, deployed version, known findings and intended release. | Review and remediation estimated separately from an independent external audit. |
Confirm external-auditor fees, legal advice, frontend and backend work, oracle or bridge integrations, deployment gas, monitoring and ongoing support in the proposal. Software development services around smart contracts need their own scope. None should be assumed included in a contract-only estimate.
The launch plan covers specification, build, internal review, external-auditor availability, remediation and deployment approval. Changes to economic rules or integrations can change the schedule; a code-complete milestone is not a mainnet-launch date.
Get a project estimateIdentify assets at risk, actors, dependencies and acceptance criteria. Before implementation, agree the economic rules and the assumptions those rules rely on.
Write the smart contract code against the approved specification. Smart contract testing covers normal flows, permission boundaries and financial invariants. Review code changes and retain reproducible results for the handoff.
Separate internal review from the independent audit of smart contracts. Record findings, fixes and accepted limitations against the reviewed source version.
Before deploying a smart contract, confirm the reviewed version, deployment authority and admin-key custody. Agree who can deploy smart contracts and which release evidence the client must approve before mainnet.
Agree who owns the repository and intellectual property, holds deployment and admin keys, approves upgrades and responds to incidents. Specify third-party licenses, monitoring, maintenance and the end of the development engagement in the contract.
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Set project-specific acceptance criteria for smart contract security. A checklist or coverage percentage alone does not establish that smart contracts are safe. Connect each criterion below to a named source version and repeatable evidence.
Test rounding across a sequence of operations, including partial withdrawals and boundary values. A single correct transaction can still leave a discrepancy when values are repeatedly divided and accumulated. Define a conservation invariant and reconciliation procedure for the complete asset flow.
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Ask each provider for work relevant to your asset flows and integrations. The engineer should explain permissions, failure scenarios and the evidence behind release decisions.
Evaluate the development team through its specification, tests and handoff artifacts. Blockchain developers can demonstrate a deep understanding of blockchain constraints by explaining dependency failures and recovery limits. Ask how those decisions affect the contract suite in your scope.
Whether you hire a smart contract company or a blockchain smart contract development agency, compare named deliverables and review responsibilities. Proposals for blockchain smart contract development services should identify repository ownership, deployment authority and support.
Shortlist top smart contract development companies using relevant implementation evidence and a reproducible handoff. A blockchain smart contract developer should explain the limits of the proposed design and how its failure cases will be tested.
Build a smart contract estimate around accepted deliverables. A hypothetical escrow budget shows engineering effort, an upgrade option and the external costs that still need quotes before launch.
Evaluate a smart contract provider through delivery evidence, actual project contribution and operational authority. Use the filled escrow RFP to align proposals before comparing their prices.
Link each smart contract requirement to an expected result, evidence and reviewer. The escrow matrix covers permissions, terminal states, expiry, pause behavior, transfer failure and unpaid obligations.
Authorize a mainnet release through a versioned manifest and ordered checks. The runbook assigns owners, required evidence and stop conditions before deployment and before enabling user activity.
Choose between fixed implementation, governed upgrades and migration from product requirements. Use a scenario matrix and permission register to record who can change the system and what remains unavailable.
Agree what must execute on-chain and what belongs in the surrounding application. These distinctions affect testing, access control and the operating responsibilities in your project brief.
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Foundry or Hardhat can automate compilation, testing and deployment for EVM contracts. Remix provides a browser-based workspace, and OpenZeppelin Contracts supplies reusable Solidity components. Connect the chosen toolkit to continuous integration, pin compiler and dependency versions, and retain test results so code changes can be checked consistently.
For an EVM app, evaluate Foundry when the team prefers Solidity-based tests and deployment scripts. Hardhat supports Solidity tests alongside TypeScript integration tests and an extensible plugin workflow. Try the same contract and application interaction in both, then choose the setup your team can maintain. Remix is useful for quick browser-based prototypes.
Foundry is a Rust-based toolkit for Ethereum and other EVM networks. Forge compiles, tests and deploys contracts, with support for fuzz and invariant testing. Anvil runs a local development node. Cast sends transactions and queries chain data, while Chisel provides an interactive Solidity environment.
Start with programming fundamentals and Ethereum accounts, transactions and gas. Learn Solidity by building a small escrow project, testing permission checks and failed transfers as well as successful flows. Use a local network first, then rehearse deployment on a public testnet. Keep the source, tests and setup instructions together so another developer can reproduce the results.
Smart contract development is the work of designing, implementing, testing and deploying programs that run on a blockchain. For a production project, it also includes specifying permissions and asset flows, reviewing security risks and preparing release procedures. Frontend, wallet and backend integration belong in the scope when the contract is part of an application.
A smart contract is a program stored on a blockchain that executes predefined rules when called. It can transfer tokens, hold funds or record state changes, depending on its code and permissions. Its behavior follows the deployed code and network rules; external information needs a data source such as an oracle.
The estimate depends on the contract scope, economic rules, integrations and testing requirements. The scope matrix above separates a bounded module, a suite, a protocol and existing-code work.
Request a proposal that identifies external costs and optional platform work.
Internal security review and an independent external audit are separate. Confirm who selects and pays the auditor, prepares the handoff, implements fixes and approves the reviewed release.
Development work or coordination alone does not constitute an independent audit.
Specification changes, integration dependencies, auditor availability, remediation and client deployment approval affect launch timing. The proposal should distinguish build milestones from the complete path to mainnet.
Existing-code review and remediation are separate engagement options. Share the repository, deployed version and known findings so the scope can distinguish diagnosis, fixes and any further independent review.
Start with the users, wallet ecosystem, transaction workload, integrations and trust assumptions. During scoping, compare the intended chain with these requirements and ask for examples of the team's relevant implementation work.
Repository and intellectual-property terms, deployment authority and admin-key custody must be explicit in the agreement. Upgrade permissions, approvals and any timelock or multisig requirements belong in the operational runbook.
Monitoring, maintenance, emergency response and further audit work need their own scope and responsibilities. Agree the support period, escalation path and change process before launch.
Pharos provides engineering services. Token classification and other legal requirements need qualified counsel.
Legal advice, jurisdiction-specific approval and regulatory guarantees are outside this development service.
They can encode token transfers, escrow conditions or protocol rules. Identify the asset, the authorized callers and the expected state changes for each proposed use.
A workflow that relies on external facts also needs a defined source for those facts.
It is a program whose code and state are maintained by a blockchain. In a project specification, name its network, address, permissions and intended behavior so the term refers to a defined component.
Both describe the same programming concept. The crypto context emphasizes digital assets, while a blockchain application may use the program to manage other shared records or permissions.
The implementation still needs explicit rules and testable outcomes.
The technology lets network participants execute and verify programmed rules. A submitted transaction invokes the relevant code; the network checks the execution under its protocol.
External information must be supplied through an agreed integration.
Define the rules and permissions, select the target network and implement the contract. Run tests locally, rehearse deployment and review the release evidence.
For production, agree independent review, deployment approval and the operational handoff as separate responsibilities.
Share the intended behavior of your smart contracts, target chain, existing repository and launch constraints. Request an NDA before sharing confidential material.
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1 dayAfter we chat about your goals and needs, we'll craft a comprehensive proposal detailing the project scope, team, timeline and budget
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1-2 daysAs soon as the contract is signed, our dedicated team will jump into action on your project!
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