India-built AI & blockchain engineering since 2017 · Serving clients worldwide

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Blockchain & Web3

Ethereum Development

Ethereum development means writing code that other people can call, copy and attack, with money attached. Speqto builds Ethereum smart contracts, token systems and dApps for startups and enterprises, including deployments on layer-2 networks, with test coverage and documentation that make independent audits faster and cheaper.

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  • Prototype in weeksProof before big budgets
  • Weekly demosSee progress, not slides
  • You own the codeFull IP assignment
  • 128+ engineersFive offices, three continents

Mainnet or layer 2: the first decision

Mainnet offers the strongest security and the deepest liquidity, but transaction costs can make consumer apps impractical. Rollups such as Arbitrum, Optimism, Base and zkSync Era cut fees sharply and inherit Ethereum's security to varying degrees, depending on their fraud proof or validity proof maturity and sequencer arrangements. Sequencer centralization and upgrade keys differ between rollups, so we review each candidate network's trust assumptions instead of treating all layer 2 options as equal.

Choose by user behavior. High-value, low-frequency settlement suits mainnet. Social, gaming and payments apps usually belong on a rollup. Since EIP-4844 introduced blobs, data costs for rollups have fallen, but withdrawal delays on optimistic rollups remain a user experience factor that needs explaining in the interface. Each contract ships with a specification written in plain language, covering roles, invariants and failure modes, which your auditors and your future engineers will both value.

How we write and test contracts

Contracts are written in Solidity with OpenZeppelin building blocks and tested in Foundry, using unit tests, fuzzing and invariant tests that state what must always hold, such as total supply equalling the sum of balances. Static analysis with Slither and fork tests against real mainnet state catch integration problems early. Where upgrades are unavoidable, we separate storage layout from logic, test every upgrade on a mainnet fork and rehearse the multisig signing procedure before it matters.

Upgradeability is a deliberate trade-off. Proxy patterns such as UUPS allow fixes but introduce admin risk, so we pair them with multisig control and time locks, or choose immutable contracts when the logic is small. Gas optimization comes after correctness, guided by profiling, not guesswork. Gas profiling guides optimization, and the result is usually a handful of changes, such as packing variables or avoiding repeated storage reads, rather than clever tricks that harm readability.

The parts around the contract

A working product needs an indexer, a reliable RPC setup with fallbacks, event handling that survives chain reorganisations, wallet connection via WalletConnect or wagmi and monitoring for abnormal contract activity. Off-chain signatures under EIP-712 and account abstraction under ERC-4337 improve usability. Reorg handling deserves attention for exchanges and payments: wait for sufficient confirmations, store block hashes and make event processing idempotent so a replayed block changes nothing.

Security work continues after deployment. We set up alerts through tools like OpenZeppelin Defender or custom scripts, document an incident playbook and keep pause functions where appropriate. Before mainnet we prepare audit packages and support an independent reviewer, then fix findings with regression tests. Monitoring is cheap compared with an incident. Alerts on large transfers, role changes, paused states and oracle deviations give your team a chance to act in minutes.

What we do

What our Ethereum Development team delivers

Specific work we do for clients, with the senior people who do it.

  • Smart contract development

    Solidity contracts for tokens, vaults, marketplaces, staking and governance, each with a written specification and documented roles and failure modes.

  • dApp front ends

    Next.js interfaces built with wagmi, viem and WalletConnect, with clear transaction states, readable errors and support for common wallets and smart accounts.

  • Layer-2 deployment

    Network selection, bridge planning and contract adaptation for Arbitrum, Optimism, Base and other rollups, including fee modeling for your expected usage.

  • Testing and fuzzing

    Foundry unit, fork, fuzz and invariant suites, plus Slither static analysis in continuous integration so regressions are caught on every pull request.

  • Indexing and backend

    Subgraphs or event-driven services with RPC redundancy and reorg-safe data pipelines that feed your application, analytics and customer support tools.

  • Audit preparation

    Specifications, threat model and clean code packages are prepared for independent security reviewers, then we fix findings and add regression tests.

Why Speqto

A team you can rely on from the first call

The habits that keep projects calm: clear scope, visible progress and engineers who stay accountable.

  • Building since 2017

    Nine years of shipping web, mobile, AI and blockchain products for startups and enterprises.

  • 128+ engineers

    A bench of senior engineers, designers and QA, so one person leaving never stalls your product.

  • Offices on three continents

    Noida HQ with teams in Surat, London, the US and Ho Chi Minh City for overlapping working hours.

  • AI-first workflow

    AI-assisted coding, testing and reviews speed delivery, with a named human accountable for every merge.

  • Weekly demos

    You see working software every week and can redirect early, long before a release surprise.

  • You own everything

    Full IP assignment, repository access from day one and an NDA before we talk details.

How we deliver

A proven process from idea to scale

Transparent, agile delivery with weekly demos and clear milestones, so you always know what is shipping and why.

  1. 01

    Discover

    Workshops to understand goals, users, data and success metrics.

  2. 02

    Plan

    Architecture, roadmap, estimate and a team shaped to your needs.

  3. 03

    Design

    UX flows, prototypes and technical design validated with stakeholders.

  4. 04

    Build

    Agile sprints with weekly demos, code reviews and automated testing.

  5. 05

    Launch

    Secure deployment, monitoring and a smooth go-live.

  6. 06

    Scale

    Ongoing optimization, new features and support as you grow.

Technology

Tools and platforms for Ethereum

The stack our engineers use on this kind of work every week.

  • Solidity
  • Foundry
  • Hardhat
  • OpenZeppelin
  • Slither
  • VIviem
  • wagmi
  • The Graph
  • Chainlink
  • SASafe multisig
  • Alchemy
  • Next.js
Outcomes

What you can expect

Every engagement is tied to measurable business results, not just deliverables.

01

Lower exploit risk

Invariant testing, fuzzing and staged releases reduce the chance of costly logic errors reaching a contract that holds user funds.

02

Sensible fee design

Network choice and gas-aware contract design keep user costs acceptable, so people can afford to use the product regularly.

03

A maintainable codebase

Documented, tested contracts that another team or auditor can read, extend and maintain without depending on the original authors.

Engagement models

Work with us the way that suits you

Start small, change the shape later. Every model includes weekly demos and full IP ownership.

Dedicated Development Team

Long-term products & roadmaps

A full, cross-functional squad (engineers, QA, designer, PM) working only on your product, managed with your processes and tools.

  • Scale up or down with 30 days notice
  • Overlap with your working hours and daily stand-ups
  • Direct access to every team member
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Staff Augmentation

Filling skill gaps fast

Pre-vetted senior engineers who join your in-house team within days to add capacity or specialist expertise.

  • Profiles shared within 48 hours
  • Flexible monthly contracts
  • Replacement guarantee
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Fixed-Scope Projects

MVPs & well-defined builds

A clear scope, timeline and price, delivered in milestones with demos at every stage.

  • Detailed estimate after discovery
  • Milestone-based billing
  • Warranty period after launch
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Managed Services

Ongoing support & operations

We run and continuously improve your applications, cloud and infrastructure under defined SLAs.

  • 24/7 monitoring options
  • Monthly reporting and reviews
  • Predictable monthly pricing
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Selected work

Products we have built

Real products shipped by our teams across fintech, Web3, AI and consumer apps.

Ouse Token product screenshot Crypto & Meme Coins

Ouse Token

Ouse Token is a meme-based cryptocurrency, inspired by internet memes and pop culture.

  • React Native
  • React
  • Node.js
  • Express
5 Months · 10 Members Paritex product screenshot Fintech and Crypto

Paritex

Paritex is a cryptocurrency exchange offering software services on blockchain, with a mobile app live on Google Play and the…

  • React Native
  • React
  • Node.js
  • Express
5 Months · 10 Members Qvani - Innovative Digital Marketplace product screenshot FinTech and Crypto

Qvani - Innovative Digital Marketplace

QVANI is a digital marketplace designed to connect buyers and sellers seamlessly across industries.

  • React
  • Node.js
  • Express
  • Firebase
5 Months · 10 Members

See all projects

Industries

Sectors we know well

Domain context shortens discovery and avoids costly rework.

FAQ

Ethereum Development FAQs

Straight answers on cost, timelines, IP ownership, team setup and how we work. Cannot find yours? Ask a solutions architect directly.

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Should I build on Ethereum mainnet or a layer 2?

Use mainnet for high-value settlement where security and liquidity outweigh fees. Use a layer 2 for frequent, low-value interactions. Many projects launch on a rollup and keep a mainnet anchor for assets of record. Many projects launch on a rollup first.

Do smart contracts need to be upgradeable?

Not always. Upgradeability allows bug fixes but adds trust in whoever holds the admin key. For simple, well-tested logic immutable contracts are often better; for evolving protocols, use proxies with multisig and time locks. Keep admin powers narrow and publicly documented either way.

How do you keep gas costs down?

By choosing efficient data layouts, minimizing storage writes, batching actions, using events instead of storage where possible and deploying on a rollup when fees matter. We measure with Foundry gas reports, not assumptions. Always measure with realistic usage, since user behavior changes the numbers.

What does an Ethereum audit involve?

An independent firm reviews the code, specification and tests, reports findings by severity and checks fixes. Good tests and clear documentation shorten the process. An audit lowers risk but never guarantees safety. Treat the audit as one control among several, alongside monitoring and caps.

Related

Explore related services

Solidity Development

Production Solidity for tokens, DeFi protocols, NFTs and DAOs, tested with Foundry and Hardhat

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Smart Contract Audit

Manual review and automated analysis of contracts before launch, with fix verification

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DApp Development

Decentralized applications with audited contracts, indexers and wallet-ready interfaces

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Solana Development

Rust programs on Solana with Anchor, built for high-throughput payments, trading and consumer apps

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Client reviews

Rated 5.0/5 by clients on Clutch

Independent, verified reviews from founders and technology leaders we have worked with. Read them in full on each platform.

Clutch 5.0 12 reviews Google 4.4 43 reviews Techreviewer 4.9 20 reviews DesignRush 4.5 2 reviews Upwork 4.9 124 reviews GoodFirms 5.0 1 review Glassdoor 4.1 49 employee reviews

“What I found most impressive about Speqto Technologies was their profound technical depth.”

Andrea Daminelli Founder & Co-CEO, Daze Milan, Italy · Blockchain development for an EV charging company
Verified review on Clutch

“The project management throughout this complex undertaking was exceptionally proactive and structured.”

Rostyslav Burylo CEO, Lynksen Lisbon, Portugal · Blockchain development
Verified review on Clutch

“Their ability to translate complex cryptographic concepts into actionable, business-aligned strategies set them apart.”

Oleksandr Sendulskyi Senior Marketing Manager, BINTIME IT Company Ukraine · Blockchain development services
Verified review on Clutch

See all reviews

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