Lead Full-Stack Engineer – B2B eCommerce

Lead Full-Stack EngineerWe are seeking a Lead Full-Stack Engineer with deep, hands‑on expertise in Next.js and Express.js to drive the development of a B2B e‑commerce platform preparing for launch. This role is for a highly technical individual contributor who owns complex problems end‑to‑end and leads primarily through direct implementation and architectural decision‑making, not task delegation.You will work across the entire stack—from event‑driven, React‑based front‑end experiences to secure, compliance‑aware API logic—ensuring correctness, performance, and strict data‑visibility enforcement in a regulated environment.This position is ideal for a developer who prefers to stay close to the code, takes personal responsibility for technical outcomes, and sets the technical bar for others through example.Key ResponsibilitiesHands‑On Technical OwnershipServe as the primary technical owner of the platform’s core functionality.Design, implement, and refine system architecture with a focus on correctness, security, and scalability.Make high‑impact technical decisions and directly implement critical paths rather than delegating them.Review code and provide technical guidance to other engineers as needed, without functioning as a people manager.Full‑Stack DevelopmentBuild and optimize the Next.js front end, including:React‑based, event‑driven UI patternsServer‑side and client‑side rendering strategiesComponent architecture, performance tuning, and state managementDesign, build, and maintain Express.js backend services, including:API routing and request handlingDataset retrieval driven by dynamic parametersRobust data validation and error‑handling strategiesPlatform & Data IntegrityImplement and enforce granular access‑control logic, ensuring correct user‑ and customer‑specific data visibility.Own data correctness across all API responses and business workflows.Collaborate closely with QA and product to ensure strong test coverage, edge‑case handling, and predictable system behavior.Security & ComplianceDevelop in alignment with CMMC objectives and secure‑by‑design principles.Ensure compliant handling of ITAR‑controlled data across two operational sites.Implement secure coding practices, logging, monitoring, and auditability to support compliance and production readiness.Collaboration & DeliveryPartner with product management and stakeholders to translate requirements into robust technical solutions.Drive the platform toward production readiness and launch through direct execution.Coordinate with DevOps on environments, deployment pipelines, and operational reliability while maintaining a strong development focus.QualificationsRequired5+ years of hands‑on full‑stack development experience with strong proficiency in:Next.js (React‑based)Node.js & Express.jsDemonstrated ability to personally design and implement complex systems, not just oversee them.Strong experience with:Event‑driven UI patternsREST API design and integrationSecure data handling and fine‑grained access‑control logicHigh attention to detail, particularly around data correctness, authorization, and edge cases.Proven delivery of production‑ready web applications.Clear communicator who can influence technical outcomes through code and technical reasoning.PreferredExperience working in regulated or security‑focused environments.Familiarity with:CMMC compliance frameworksITAR data handling requirementsExperience with B2B, enterprise, or multi‑tenant platform design.Strong working knowledge of relational databases (e.g., PostgreSQL, SQL Server).Exposure to cloud platforms such as Azure or AWS.Nice‑to‑HaveExperience implementing RBAC or ABAC models.Knowledge of event‑driven backend patterns (queues, workers).Practical DevOps familiarity (CI/CD, containerization, infrastructure as code).