Smart contract development turns agreed product rules into code, tests and a deployment plan. Pharos builds smart contracts for token modules, DeFi protocols and the applications that use them, with deliverables defined in your scope.
Plan blockchain solutions with separate responsibilities for implementation, internal security review and independent audit. Application integration and ongoing support are scoped separately. Release approval and key custody must be agreed 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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Pharos Production Inc. delivered a reliable game that received great reviews from testers and co-promotion partners. The team was highly responsive, flexible with changes, and delivered work on time. Moreover, their impressive quality and fair pricing stood out.
Pharos Production delivered an adaptable digital health platform that enabled us to swiftly introduce new patient services while ensuring robust data security. Their technical skills and forward-thinking attitude gave us the confidence to grow as our user community flourished!
Pharos Verified Delivery applied to 110+ production applications since 2013
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.
The audit handoff identifies the reviewed source version, dependency versions and commands needed to repeat the checks. Agree which findings are open, who implements fixes and who verifies them. Internal review and an independent external audit remain separate workstreams.
Public reference: Version-scoped Ludo report.
Release handoff records the deployment scripts and addresses for the agreed source version. Specify upgrade procedures, admin-key custody and any support responsibilities that continue after acceptance.
The service covers an individual on-chain module or the application that uses it. For smart contracts, the agreed scope sets asset flows, interfaces, responsibilities and acceptance criteria before implementation begins.
For financial smart contracts, scope lending, staking or exchange rules with oracle dependencies, liquidation behavior and emergency permissions. An example acceptance criterion: a caller without withdrawal permission cannot move another user's balance.
For issuance smart contracts, agree minting permissions, metadata control and transfer restrictions. Example criterion: minting above the specified supply limit must fail. Confirm how marketplace integrations will be tested.
Application integration connects wallet actions to on-chain calls and the backend or interface that presents their results. For smart contracts accessed through the product, scope approvals, transaction status and failed-operation handling separately from the contract rules.
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The cost of smart contracts depends on the rules, integrations and evidence required for release. A simple contract with bounded permissions differs from an interacting suite. We estimate implementation and review after assessing the specification. The scope options below 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 estimateStart with the work you need. Share your requirements for a scoped proposal.
A defined token, vesting, escrow or other bounded contract component. Estimate inputs: Rules, roles, target chain and integration points.
Interacting smart contracts with shared permissions, tests and deployment dependencies. Estimate inputs: Architecture, economic rules, existing code and audit expectations.
Financial rules implemented in smart contracts, with protocol-specific risks and integrations. Estimate inputs: Economic model, asset flows, oracle assumptions and operational controls.
Review of an existing repository and agreed implementation of fixes. Estimate inputs: Repository, deployed version, known findings and intended release.
Each engagement is quoted after reviewing the agreed requirements.
Add engineers to your existing team for a defined backlog. Keep product priorities and day-to-day direction with your lead.
Work with an allocated team for continuing delivery. Agree the roles, backlog and review cadence before work starts.
Give Pharos responsibility for an agreed implementation scope, milestones and handoff. Your team approves the acceptance criteria and release.
Explore the delivery specifications and constraints, or send us your requirements to discuss them with our team.
Tool selection must support a build the client can reproduce and tests for the chosen execution model.
A reproducible development environment records compiler settings, dependency versions and build commands for smart contracts. Source written in languages such as Solidity compiles to bytecode for the target EVM version. Evaluate programming languages like Solidity against the testing libraries and experience available to the team.
Build reference: Compiler metadata describes settings and source hashes used to verify a build.
Reusable components bring existing libraries and their licenses into the agreed codebase. Review each dependency against the permissions and asset flows of your smart contracts.
On the selected blockchain network, rehearse user flows before mainnet approval. Keep test commands and release instructions with the reviewed source so another engineer can repeat the checks.
A suitable execution model matches the intended users, wallet support and operational constraints. Compare various blockchain platforms by fees, trust assumptions and integration requirements. Experience on one chain does not establish readiness for specific blockchain platforms.
Select an EVM-compatible network by wallet support, expected transaction load, fees and required oracle or bridge integrations. For smart contracts, confirm the target chain and dependency addresses during scoping. The Ethereum Virtual Machine defines execution behavior; network compatibility alone does not establish that the complete application will work.
Technical reference: EVM execution model.
For Polygon or another EVM-compatible network, test smart contracts against the dependencies they will actually call. Confirm network configuration and wallet behavior; compatibility alone does not verify the complete application. When assessing BNB (BSC), historically called Binance Smart Chain, confirm the intended network and integrations.
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.
Technical reference: Bitcoin transaction model.
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.
Agree the boundary before implementation. The same asset flow may involve on-chain rules, a wallet interface and an external data source, each with different responsibilities.
Selected badges from Clutch, GoodFirms and The Manifest. Open the issuer profiles to review categories and dates.
Identify 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.
Repository and intellectual-property ownership, deployment authority and admin-key custody belong in the agreement. Name who approves upgrades and responds to incidents. Record third-party licenses, monitoring, maintenance and the point where the development engagement ends.
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.
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.
Compare named deliverables and review responsibilities. Proposals for smart contracts should identify repository ownership, deployment authority and support. Ask which decisions require client approval and who responds if a dependency fails.
Shortlist providers using relevant implementation evidence and a reproducible handoff. For smart contracts that hold value, request tests for withdrawal limits and privileged operations. Ask the engineer to explain the limits of the design and how failure cases will be tested.
The engineering practice is led by Dmytro Nasyrov, Founder and CTO. See our editorial policy for how sources and review responsibilities are described.
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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.
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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