Payment Gateways & PCI DSS Infrastructure

• Gateway architecture built to PCI DSS v4.0.1 and card-scheme requirements: cardholder-data-environment scope defined at the design stage, PAN protection via tokenization or field-level encryption with key management, hosted-payment-page integrity controls, and multi-tenant service-provider obligations under Appendix A1.
• Correct transaction modelling: separate authorisation and capture events, an append-only double-entry ledger with idempotency keys, signed and replay-protected webhooks, and daily reconciliation against acquirer and scheme clearing files
• A QSA engaged early for scope review, ahead of a formal assessment

Card Programme Integration

Engineering for card issuing on white-label programmes: ledger and reconciliation design, authorisation versus settlement handling, PCI-scope minimisation through provider-hosted fields and tokens, and the currency-conversion logic crypto-funded cards add.

• Built and maintain the engineering side of the KimlCards programme

Our role here is engineering. We are not an issuer, a payment institution, or a programme manager, and we do not hold client funds.

Smart Contract Development & Security

As a smart contract development company, we deliver end to end: requirements and spec, architecture design, development, internal testing, external audit, testnet staging, then mainnet deployment and handover.

• EVM and non-EVM architecture for blockchain smart contract development, scoped to gas costs, tooling maturity, and long-term maintainability
• Built against known vulnerability classes: reentrancy, integer overflow and underflow, access-control flaws, price-oracle manipulation, front-running, and gas-limit denial-of-service
• Independent third-party audit built into the project timeline as a standard phase, not an open-ended add-on

Ask us about our smart contract development services for a specific due-diligence checklist covering audit process, tech stack, and past deployments.

Product Engineering: Web, Mobile & dApp

As a dApp development company, we deliver across all five layers of a modern dApp: on-chain contracts, off-chain indexing, off-chain compute and backend services, oracle integration, and the front end.

• Non-custodial wallet engineering: on-device key generation (BIP-39/32/44), hardware-backed key storage, multi-chain support, and a hardened, authenticated API layer
• Delivered and maintained in production: KimlWallet and DokWallet

Exchange & Trading Infrastructure

Trading systems for two distinct kinds of operator. In both cases the engagement is engineering delivery.

• Trading tools for regulated exchanges. Order-book and matching infrastructure, execution and routing logic, market-data and analytics pipelines, reporting to support supervisory obligations, and the integrations a licensed venue needs to connect its own liquidity providers and counterparties.
• Decentralized exchange development. Core smart contracts, front-end trading interface, indexing and analytics infrastructure, and security audit through testnet staging, for non-custodial venues.
• AMM, order-book, and hybrid exchange architectures, scoped to expected trading conditions and token economics
• Liquidity provider and routing integrations: we build the connections, controls, and monitoring surface. The operator appoints and contracts with the liquidity provider.
• Exchange tooling delivered for Kimel Exchange

Whether you're evaluating us as a DEX development company or for a specific trading-tools engagement, this is engineering delivery only. We do not operate the exchange, hold client assets, execute orders, provide liquidity, or make markets on it.

DevOps & Cloud Infrastructure

Infrastructure built for fintech and crypto operating conditions: isolated environments per account, infrastructure as code, disciplined secrets management, node redundancy for blockchain-specific failure modes, and observability with defined backup and recovery targets.

AI Tooling for Marketing & Operations Teams

Internal tools scoped from a specific, repetitive task rather than a general "add AI" brief. We use retrieval over fine-tuning, an explicit data-governance position (GDPR, EU AI Act transparency obligations), a test set for evaluation, and a deliberate human-review checkpoint before anything ships.

• Delivered for 47 Yards and Masterclick