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# Blockchain Platform EngineerApply**Job#: 3037300****Job Description:****Blockchain Platform Engineer****Position Overview**We are seeking a Senior Engineer, Blockchain Platforms to help build and integrate the core blockchain infrastructure powering digital asset custody and tokenization platforms. This role sits at the intersection of blockchain protocol engineering and institutional custody systems, focusing on Layer-1 integrations, wallet architecture, and secure transaction workflows.This is a hands-on engineering role working closely with cryptography, custody, and security teams to ensure blockchain interactions are secure, scalable, observable, and production-ready.**Why Join Us**This role is critical in building the foundation for next-generation digital asset custody and tokenization platforms, offering the opportunity to work on cutting-edge blockchain infrastructure at enterprise scale.**Key Responsibilities**Layer-1 Blockchain Integration* Integrate internal systems with Layer-1 blockchains (e.g., Ethereum and similar platforms)* Evaluate and extend blockchain capabilities to support scalability, resilience, and custody requirements* Understand and manage core blockchain mechanics including transaction lifecycle, finality, forks, reorgs, and event propagation* Ensure integrations remain stable and performant under production-scale loads**Blockchain Infrastructure Development*** Design and build core infrastructure services such as: + Blockchain indexers and event processors + Block explorers and observability tools + Chain data services and APIs + Cross-chain and interoperability components* Ensure data pipelines are accurate, performant, and auditable* Develop tools for monitoring, troubleshooting, and incident response**Wallet Architecture & Engineering*** Design and implement blockchain-integrated wallet services* Build transaction lifecycle components including: + Transaction creation and signing workflows + Submission pipelines to blockchain networks* Integrate with secure key management systems (e.g., MPC, HSMs)* Ensure clean separation between protocol logic, security layers, and business logic**Custody & Blockchain Operations*** Support custody-related workflows including: + On-chain transaction execution + Event monitoring and reconciliation + Failure handling and recovery mechanisms* Define safe interaction patterns with smart contracts and token standards* Ensure workflows align with custody governance, approvals, and risk controls**Engineering Excellence & AI Utilization*** Build highly reliable and observable blockchain systems using modern engineering practices* Leverage GenAI and agentic AI tools to accelerate: + Protocol analysis + Code development and testing + Documentation and knowledge sharing* Maintain strong engineering discipline focused on accuracy, security, and performance**Required Qualifications*** 7+ years of professional software engineering experience* Hands-on experience working with blockchain or distributed ledger technologies* Strong understanding of Layer-1 blockchain protocols and transaction lifecycles* Experience building backend systems, APIs, and infrastructure services* Proficiency in one or more programming languages such as Go, Java, Rust, or Python* Ability to collaborate across engineering, security, and platform teams**Preferred Qualifications*** Experience building blockchain indexers, explorers, or analytics platforms* Familiarity with wallet architecture, signing workflows, and key management systems* Experience working in crypto custody or security-sensitive financial systems* Strong debugging experience in distributed, asynchronous environments* Experience leveraging AI tools to enhance development workflows**What Success Looks Like*** Blockchain integrations are reliable, scalable, and observable* Wallet and transaction pipelines operate correctly across normal and edge-case scenarios* Custody platforms interact with blockchain networks securely and consistently* Incidents are quickly diagnosed with strong monitoring and observability frameworksEEO EmployerApex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at employeeservices@apexsystems.com or 844-463-6178. *Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico.**Everforth Apex uses a virtual recruiter as part of the application process. Click here for more details. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at https://www.apexsystems.com/privacy-policy**Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Everforth Apex team member can provide.**Everforth Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.**If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at accommodations@apexsystems.com or 804-523-8228. Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered.**UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex Systems.***Employee Type:** Contract**Location:** Southlake, TX, US**Job Type:****Date Posted:** June 5, 2026**Pay Range:** $70 - $85 per hour #J-18808-Ljbffr