Blockchain App Development
Build secure blockchain applications with StepTo, smart contracts (Solidity, Rust), DeFi platforms, NFT marketplaces. Serbia-based, 40-60% cost savings.
Reviewed by Igor Gazivoda, Co-founder & CEO of StepTo · Updated
StepTo's blockchain app development spans smart contracts, decentralised applications (dApps), tokenisation, and the off-chain infrastructure, indexers, APIs, frontends, that makes on-chain systems usable. We build and audit blockchain products for fintech companies, web3 startups, and enterprises exploring tokenisation, as a specialised track within our custom software development services. Our Serbian engineers (part of a 60,000-strong national IT workforce) deliver web3 engineering at $35–75/hr for most delivery work, 40–60% below Western web3 agency rates. Smart-contract security is highest when the engineer who wrote a contract is still around to reason about its edge cases, so StepTo keeps turnover low, with 2.5+ years of average developer tenure, rather than rotating contractors through security-critical code.
What Blockchain Solutions Does StepTo Build?
- Smart contract development: Solidity (Foundry/Hardhat) for EVM chains and Rust (Anchor) for Solana, token standards, vesting, staking, escrow, and custom protocol logic.
- DeFi applications: Lending markets, DEX integrations, yield vaults, and liquidity management tooling with oracle integration (Chainlink) and rigorous economic-edge-case testing.
- NFT platforms & marketplaces: Minting flows, royalty enforcement, allowlists, and marketplaces with lazy minting and gas-efficient batch operations.
- Tokenisation for enterprises: Asset-backed tokens, loyalty tokens, and permissioned ledgers (Hyperledger Fabric) with the compliance hooks regulated businesses need.
- dApp frontends & wallets: React/Next.js frontends with wallet connectivity (wagmi/viem, WalletConnect), transaction UX, and account-abstraction (ERC-4337) onboarding.
- Indexing & data infrastructure: Subgraphs (The Graph), custom indexers, and APIs that make on-chain data queryable for products and analytics.
- Smart contract review & rescue: Internal reviews, gas optimisation, and remediation of inherited or stalled web3 codebases ahead of independent audits.
How Do We Keep Smart Contracts Secure?
- Proven building blocks: OpenZeppelin contracts and audited patterns rather than novel primitives, unless the product genuinely requires them.
- Testing depth: Unit, fork, and invariant/fuzz testing in Foundry; static analysis with Slither on every change.
- Deployment discipline: Testnet soak periods, multisig-controlled deployments, timelocked upgrades, and documented emergency procedures.
- Independent audits: For value-holding contracts we plan an external audit into the budget and timeline from day one, and handle finding remediation.
How Much Does a Blockchain Project Cost?
- Fixed-scope build: Contracts, tests, frontend, and deployment for a defined protocol or product, typical range $30,000–250,000. Rates $35–75/hr for most delivery work; see pricing.
- Dedicated web3 team: From $13,500/month for protocols and platforms under continuous development after launch.
- Staff augmentation: Solidity, Rust, or full-stack dApp engineers joining your team from $4,500/month per engineer.
Why Choose StepTo for Blockchain Development?
- Honest scoping: If your use case does not need a chain, we will recommend the cheaper conventional build instead.
- Full-stack delivery: Contracts, indexing, backend, and frontend from one team, most dApp failures happen in the seams between specialists.
- Cost leverage where it counts: Security-grade web3 engineering is expensive in Western markets; at a blended $35–75/hr you can afford the test coverage and review cycles that safety requires.
- CET timezone: Live collaboration with EU teams and 3-4 hours of overlap with US East Coast, useful during launches and incident response.
How Does a Blockchain Project Get Delivered?
- Feasibility & chain selection (1–2 weeks): Use-case validation, chain and L2 economics, regulatory considerations, and architecture outline.
- Protocol design: Contract architecture, upgradeability and governance model, and threat modelling.
- Implementation: Contracts with full test suites in parallel with frontend and indexing development.
- Internal review & testnet: Peer review, fuzzing, static analysis, and a public or private testnet phase.
- External audit & remediation: Independent audit for value-holding contracts; findings fixed and re-verified.
- Mainnet launch & operations: Multisig deployment, monitoring, and ongoing protocol development.
What Should You Settle Before Starting a Blockchain Build?
- How much does blockchain app development cost?
- A tokenisation or NFT project with standard contracts (ERC-20/721/1155) and a minting frontend typically costs $30,000–70,000 over 2–4 months. A DeFi protocol or marketplace with custom contract logic, subgraph indexing, and a full dApp frontend usually runs $80,000–250,000, plus the budget for an independent security audit, which we strongly recommend before mainnet. StepTo bills $35–75/hr for most delivery work, roughly 40–60% below Western European or US web3 agencies.
- Which blockchains do you develop for?
- EVM chains are our core: Ethereum mainnet and L2s (Arbitrum, Optimism, Base, Polygon) using Solidity with Foundry or Hardhat toolchains. We also build on Solana (Rust/Anchor) and work with enterprise/permissioned platforms such as Hyperledger Fabric where a public chain is not appropriate. Chain choice is a cost-and-audience decision we work through with you, L2s cut transaction costs dramatically for consumer apps.
- How do you secure smart contracts before launch?
- Our baseline: battle-tested libraries (OpenZeppelin) over hand-rolled primitives, near-total unit and invariant test coverage in Foundry, fuzzing, static analysis (Slither), internal peer review, and a testnet deployment with a bug-bounty window. For contracts holding significant value we require an independent third-party audit before mainnet deployment, we prepare the codebase and documentation so the audit is fast, and we remediate findings.
- Do we actually need a blockchain, or would a database do?
- We ask this first in every engagement. Blockchain earns its cost when you need shared state between parties that do not trust each other, censorship resistance, or user-owned assets. If a single organisation controls all the data, a conventional system from our custom software practice is cheaper, faster, and easier to run, and we will say so before you spend money.
- Can you maintain a protocol after launch?
- Yes. Post-launch work includes monitoring on-chain activity, operating keepers and indexers, managing upgrades through timelocks or governance, and building new features. Most web3 clients keep the original engineers through a dedicated team from $13,500/month, or add individual Solidity/Rust engineers to their own team via staff augmentation from $4,500/month.