Smart Contract Solutions

Solidity Development

Production EVM engineeringUpgradeable proxies · AA · gas-aware storageFoundry · OpenZeppelin · CI regressionsMixBytes-ready audit packages

OQTACORE provides Solidity development for EVM products that need precise on-chain logic, gas-aware implementation, clean upgrade paths, and integrations with wallets, APIs, indexers, custodians, and compliance systems.

Get senior Solidity engineers who write maintainable code, design proper upgrade paths, and care about gas, storage, and integration ergonomics.

Engagements typically run 4–14 weeks · Scoped from one critical module to a multi-release Solidity programme.
Since 2017Shipping Web3 and deeptech products
50+Full-scale apps shipped
20+Blockchains supported in production
MixBytesPrimary smart contract audit partner
Working alongside
TON FoundationPlanckAlvrenEMCDRollman Capital
Smart contract audits
Primary audit partner:MixBytes
Also audited by:Pashov ·0xleastwood ·Zellic ·Certik ·Halborn ·Hacken ·Sherlock
What it is

Defining solidity development

Solidity development is the discipline of writing, verifying, and maintaining EVM bytecode — including upgradeable layouts, abstracted accounts, and protocol integrations — where storage layout, opcode-level assumptions, and compiler versions determine whether a patch is safe.

OQTACORE delivers Solidity development with layout discipline, differential tests across upgrades, and explicit compiler pins so teams do not learn about storage corruption or broken delegates during a live incident.

What you get

What OQTACORE delivers in solidity development

Senior engineers, security-aware architecture, and an operations-ready handoff. Every engagement is scoped to your specific product, chain, and timeline.

Architecture and contracts

Senior Solidity (and Rust where the chain demands it) with explicit invariants, role separation, and upgrade paths defined up front.

Tests that prove behavior

Unit, integration, fork, fuzz, and invariant tests — not coverage theater. Tests catch regressions and stop bad upgrades.

Security-aware engineering

Threat modeling per module, automated scanning, manual review, and audit-prep so external auditors find nothing surprising.

Deployment and verification

Deterministic deployment scripts, source verification, network bootstrapping, role configuration, and admin handoff.

Operations and monitoring

Pause flows, multisig wiring, alerting, dashboards, runbooks, and on-call coverage for the first weeks of production.

Product integration

Frontend, backend, indexers, wallets, payments, custodians, and analytics so contracts ship as part of a working product.

From specification to mainnet-ready bytecodeArchitecture, implementation, and proof stay linked so upgrades do not outrun the tests.
DESIGNVERIFY & SHIPMechanism specRoles · invariantsSolidity modulesOZ · proxiesIntegrationsOracles · APIsCI / branchesReviews per PRFoundry testsFuzz · fork · invariantInternal reviewThreat passDeploy + monitorEvents · runbooks
How we work

A six-phase solidity development delivery you can plan around

Predictable milestones, clear ownership, and a security pass on every meaningful change. No mystery between scoping and launch.

01

Discovery and threat model

Map assets at risk, user roles, integrations, regulatory context, and acceptance criteria so we agree on what success looks like before any code is written.

02

Architecture and scope

Choose chain, language, contracts, services, and integrations. Lock in scope, milestones, ownership, and how third-party teams plug into the build.

03

Implementation

Senior engineers ship in short cycles with code review on every change, security checklists per module, and tests written next to the code that needs them.

04

Internal security review

We re-read the code as adversaries: reentrancy, oracle and MEV exposure, access control, accounting precision, upgrade safety, and operational keys.

05

Testnet and staging

Deploy to testnets and staging environments with full frontend, indexer, and monitoring integration. Fix what only shows up under realistic conditions.

06

Mainnet launch and run

Coordinate audit findings, plan rollout, deploy with verification, set up monitoring and alerts, and stay on for the first weeks of production.

Need EVM specialists on an upgrade or integration?

Tell us about your product, chain, timeline, and the outcome you need. We will reply within one business day with a clear next step — a scoping workshop, an audit, or a delivery plan.

Start a conversation

Five fields. We respond within one business day.

One business day reply. NDA on request.
Technology

The stack we use for solidity development

We pick tools because they make the product safer, faster, or easier to operate — not because they are trending. Here is what tends to show up in solidity development work.

Solidity
Foundry
Hardhat
OpenZeppelin
Ethers.js
Wagmi
Viem
Tenderly
Chains we ship to
How they differ

Senior Solidity development vs. generic backend porting

Both write functions. Only one treats storage layout, delegatecall boundaries, and chain quirks as non-negotiable constraints.

Dimension
Senior Solidity development
Generic backend porting
Layout
Storage slots, gaps, and initializer order are designed before features land.
Structs grow casually; upgrades risk silent corruption.
Dependencies
External calls specify failure modes, reentrancy guards, and return-data handling.
Low-level calls ignore revert data until production breaks.
Tooling
Foundry fuzz and invariant suites run in CI on every Solidity change.
Manual testing on a single chain ID misses fork-specific bugs.
Security
MixBytes and static analysis checkpoints precede irreversible deploys.
Security review is optional and late.
Maintainability
Modules, interfaces, and NatSpec match how auditors and new hires read code.
Tight deadlines produce opaque files nobody can extend safely.
Outcomes

What solidity development delivers in production

Predictable upgradesStorage gaps, initializer flows, and migration tests documented
Gas-aware implementationsHot-path profiling and snapshot regressions on critical functions
Safer integrationsTyped interfaces, fork tests, and failure handling for external calls
Audit-smooth handoffsDiff narratives, invariant lists, and Slither exports per release

Where Solidity development with OQTACORE pays off

Payoff is highest when upgrades are inevitable: treasuries, protocol fee switches, modular vaults, and institutional deployments where counsel expects reproducible change management. We calibrate depth to your surface area without claiming unrelated flagship launches as prior work.

Delivery can include subgraph hooks, operational dashboards, and deployment automation so Solidity changes do not stop at merge. The goal is maintainable EVM code your organisation can extend with the same discipline we used to write it.

How a Solidity development engagement starts

A technical workshop captures repositories, branching policy, target chains, and launch pressure. We return a milestone plan with test gates and, when needed, an audit runway aligned to MixBytes or your chosen firm.

You can engage for a focused upgrade remediation, a new module, or a multi-quarter programme. Timelines track the four-to-fourteen week band unless multiple integrations or formal verification scope expand the work.

FAQ

Solidity Development — questions before you start

The answers most teams ask for before scoping a project with us.

What does Solidity development cost and how long does it take?

Most Solidity programmes we scope run about four to fourteen weeks after materials are stable. Pricing follows the module list, upgrade complexity, and whether formal audit is on the critical path — set during a scoping call so estimates reflect real engineering work rather than a generic quote.

Can OQTACORE work inside our existing repository and toolchain?

Yes. We adopt your Hardhat or Foundry layout, CI rules, and branching model, and we keep analysis artefacts beside the code reviewers expect. If tooling is missing, we introduce Foundry fuzz and Slither snapshots in a way your team can run locally.

How do you coordinate audits for Solidity changes?

We maintain continuous internal review, then schedule MixBytes or your preferred auditor with enough time for fixes. Handoff includes scope memos, threat summaries, and reproducible tests so firms from the broader audit network (Pashov, 0xleastwood, Zellic, Certik, Halborn, Hacken, Sherlock) can start efficiently when you select them.

How long does solidity development take?

A small, well-scoped module can take 2–4 weeks. A protocol, tokenization workflow, marketplace, or DeFi system can take 6–16+ weeks depending on integrations, testing depth, audit requirements, and governance complexity.

Can OQTACORE work with an existing codebase?

Yes. We can review existing contracts, improve tests, fix vulnerabilities, add features, prepare for audit, or integrate the contracts with backend and frontend systems.

Do you provide audits as well as development?

Yes. We provide internal security review and audit-preparation support, and we can also help resolve third-party audit findings. For high-value launches, an independent external audit is still recommended.

Which chains do you support?

We commonly work with Ethereum and EVM-compatible networks, and can support other ecosystems depending on scope. Chain choice is usually part of the architecture discussion.

Can you also build the application around the contracts?

Yes. OQTACORE can deliver the frontend, backend, wallet flows, APIs, indexing, analytics, admin panels, CI/CD, monitoring, and documentation needed to turn contracts into a product.

Ready when you are.

Send a few lines about your project. We will reply within one business day with a clear next step — a scoping workshop, a security review, or a delivery plan with milestones.

Prefer a longer brief or want to share an NDA before we exchange details? Mention it in the message and we will route it appropriately.

Engagements typically run 4–14 weeks · Scoped from one critical module to a multi-release Solidity programme.

Page last reviewed May 7, 2026

Start a Solidity development engagement

One business day reply. NDA on request.

One business day reply. NDA on request.