Financial Controller

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Ostium

WebsiteLinkedInAll Job Openings

11 - 50 employees

₿ Crypto

💳 Fintech

Crypto • Fintech

Ostium is a self-custodial, blockchain-native leveraged trading platform that lets users trade perpetual contracts on traditional assets (stocks, FX, indices, commodities) directly on Arbitrum. It provides high-leverage trading (up to 200x), uses USDC for settlement, and emphasizes on-chain transparency—public fees, volumes, and liquidity—so users retain custody of their funds without broker intermediaries. Ostium bridges DeFi and TradFi by offering familiar trading products with decentralized custody, instant deposits, and features like one-click trading, session keys, and gas sponsorship.

📋 Description

• Own the monthly and quarterly close across all entities, consolidating fiat and onchain activity into clean US GAAP financials on a predictable cadence. • Value the protocol's collateral pool, open positions, and P&L. Account for and reconcile fee, funding, spread, and liquidation revenue. Reconcile onchain state to the books daily, not monthly. • Own crypto treasury, stablecoin flows, wallet-level reconciliation, gas, and protocol revenue, while applying digital asset fair value treatment correctly. • Build the reconciliation and control environment from the ground up, wiring onchain data directly into the books. This is an AI-native function. You'll leverage tooling to reconcile at chain speed rather than throwing headcount at the problem. • Manage external auditors and drive first audit readiness. Coordinate crypto and multi-entity tax across jurisdictions. Support entity structuring. • Manage cash and stablecoin balances, runway, and collateral movements alongside trading and operations. Deliver investor and board reporting. • Own AP, payroll, vendor management, and equity/token compensation accounting.

🎯 Requirements

• CPA (Active): Deep US GAAP fluency and demonstrated ownership of a full audit-ready close. • Dual-Domain Fluency: Real, hands-on experience in both TradFi (positions, NAV, brokerage, or fund accounting) and crypto/digital asset accounting. You can reconcile a margin book and a Web3 wallet in the same afternoon. This is the non-negotiable spine of the role. • Relevant Environment: Experience at a broker-dealer, prime broker, hedge fund, fund administrator, or trading firm where you accounted for positions, margin, and mark-to-market, plus hands-on crypto-native accounting (onchain reconciliation, DeFi protocol revenue, stablecoins). • Onchain Fluency: You can read a block explorer, deeply understand wallets and smart contract interactions, and reconcile directly against onchain data as your absolute source of truth. • Systems: Fluency with a core ERP (QuickBooks) and a crypto subledger is important. • High Agency: You've built or materially rebuilt a finance function in a fast-moving, resource-constrained environment. You escalate with proposed fixes, not just variances, and you're perfectly comfortable being the entire function before you build a team. • Bonus: Multi-entity international experience, VC-backed startup audit and fundraising support, and deep expertise in crypto tax.

🏖️ Benefits

• Highly competitive compensation package • Flexible work arrangements