Senior Blockchain Platform Engineer

Overview

Aquent Talent is partnering with a leading financial services institution that is at the forefront of innovation, dedicated to shaping the future of finance through cutting-edge technology. Our client is committed to delivering robust, secure, and scalable solutions that redefine how financial transactions and assets are managed. This is an incredible opportunity to join a forward-thinking team and make a significant impact on the next generation of financial infrastructure.

About the Role

Are you ready to be a pioneer in the world of decentralized finance? We are seeking a visionary engineer to design, build, and scale the foundational blockchain and tokenization infrastructure that will power the future of our client’s operations. This is a hands-on role where you will not only architect solutions but also bring them to life, transitioning from prototypes to secure, scalable, and production-ready systems. Your work will directly influence the strategic direction of our client’s emerging technology landscape, enabling new capabilities across smart contracts, token lifecycle services, blockchain connectivity, and sophisticated distributed systems. If you thrive on complex challenges and want to leave your mark on an evolving industry, this role offers an unparalleled opportunity to innovate and lead.

Key Responsibilities

• Design and build reusable Web3 platform services for tokenization, transaction processing, blockchain connectivity, wallet integration, event ingestion, indexing, and token lifecycle management.
• Develop backend services that interact with blockchain nodes, smart contracts, signing systems, custody platforms, and off-chain systems.
• Create common blockchain abstraction layers to support multiple networks, including Besu, Canton, Ethereum/EVM, Layer 2 networks, permissioned chains, and future enterprise blockchain platforms.
• Build integrations with Besu, Ethereum-compatible networks, and permissioned EVM chains.
• Implement blockchain connectivity using JSON-RPC, WebSocket subscriptions, ABI encoding/decoding, event logs, transaction submission, transaction status tracking, and smart-contract queries.
• Support engineering patterns for Canton/Daml-based blockchain networks, including validator or participant connectivity, application package lifecycle, transaction authorization, and workflow integration.
• Work with Daml application concepts, including DAR package deployment, versioning, installation validation, and application enablement.
• Build or integrate services that support Canton-style workflows, institutional transaction authorization, wallet integration, and node connectivity.
• Partner with platform, infrastructure, and operations teams to evaluate Canton validator strategies, including self-hosted and provider-operated models where applicable.
• Design, develop, integrate, and review smart contracts for tokenized asset and programmable workflow use cases.
• Work with Solidity, EVM token standards, upgradeable contracts, proxy patterns, access-control models, permissioned-token designs, and contract event models.
• Build smart-contract interaction layers that manage ABI encoding, calldata construction, transaction simulation, event decoding, and contract state reads.
• Establish engineering standards for smart-contract development, testing, deployment, versioning, rollback planning, and production change governance.
• Support smart-contract security practices, including threat modeling, static analysis, fuzzing, invariant testing, and secure deployment pipelines.
• Integrate with institutional wallet, custody, signing, and authorization platforms that support tokenized asset workflows.
• Design transaction orchestration workflows covering request validation, policy checks, approval routing, signing, submission, confirmation tracking, retries, exception handling, and audit logging.
• Support address or account registration, transaction limits, allowlists, signing policies, approval workflows, and operational controls.

Required Skills & Experience

• 5+ years of software engineering experience building distributed systems, backend platforms, financial systems, blockchain infrastructure, custody platforms, trading systems, or high-scale transaction systems.
• Strong hands-on Web3 engineering experience.
• Deep understanding of Ethereum/EVM, including smart contracts, ABI encoding, transaction lifecycle, gas/fee handling, nonce management, logs/events, confirmations, and finality.
• Experience building backend services that interact with blockchain nodes, wallets, smart contracts, signing systems, or custody platforms.
• Experience with JSON-RPC, WebSocket subscriptions, blockchain event indexing, smart-contract integration, transaction monitoring, and blockchain data models.
• Strong understanding of wallet infrastructure, transaction signing, address management, custody concepts, and key-management patterns.
• Strong backend engineering skills in one or more languages such as Java, Go, Kotlin, TypeScript, Rust, Python, or C++.
• Experience with APIs, microservices, event-driven architecture, messaging systems, cloud-native engineering, and production operations.
• Ability to independently own complex engineering problems from design through production delivery.
• Experience with Canton, Daml, validator/participant concepts, DAR deployment, or institutional blockchain workflows.

Preferred Skills & Experience

• Experience with Besu, permissioned EVM networks, or private blockchain deployments.
• Experience with Canton, Daml, validator/participant concepts, DAR deployment, or institutional blockchain workflows.
• Experience with smart-contract audits, fuzz testing, invariant testing, static analysis, formal verification, or secure smart-contract deployment.
• Experience building blockchain indexers, transaction orchestration systems, custody integrations, token lifecycle platforms, or wallet-policy engines.
• Experience with token standards such as ERC-20, ERC-721, ERC-1155, ERC-1400, ERC-3643, or other permissioned-token frameworks.
• Experience building systems in regulated, security-sensitive, or high-value transaction environments.
• Relevant blockchain certifications or training are a plus, including Besu training/certification and Daml/Canton-related certification paths.

Please note: This position is available on a W-2 employment basis only and is not open to Corp-to-Corp (C2C) arrangements. The client is also unable to provide employment-based visa sponsorship or transfers for this role.

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About Aquent Talent:

Aquent Talent connects the best talent in marketing, creative, and design with the world’s biggest brands.

Our eligible talent get access to amazing benefits like subsidized health, vision, and dental plans, paid sick leave, and retirement plans with a match. 

Aquent is an equal-opportunity employer. We evaluate qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, veteran status, and other legally protected characteristics. We’re about creating an inclusive environment-one where different backgrounds, experiences, and perspectives are valued, and everyone can contribute, grow their careers, and thrive.