Senior Full-Stack Developer - Lead Management & CRM Platform

**To apply, kindly submit your resume in English. Please note that any other format will not be considered.**Who we are:Kajae is a premium staff augmentation company that connects top global talents to thriving US companies and clients, offering fully remote opportunities. Our team hails from over 27 different countries, with the majority coming from the Philippines and Latin America. We pride ourselves on our tight-knit culture and strong bonds, despite working remotely across diverse time zones.Benefits you get by working for us:Competitive salary – paid in USD - Receive your compensation in US dollars, providing stability and global value for your hard work.100% fully remote setup - Work from anywhere in the world—permanently. Enjoy the freedom and flexibility of a remote role while staying close to what matters most. No more commuting hassles, and more time for life’s important moments.Healthy work-life balance - We prioritize your well-being. Through regular check-ins during your first few months, we offer ongoing support and career guidance. We also ensure you’re partnered with top-tier clients in a positive, healthy work environment.Health insurance - Get covered starting your third month with us—your health and peace of mind matter.Mental health support - Our in-house mental health professional is available to ensure you have access to the emotional and psychological support you need to thrive.Referral bonuses - Know someone great? Refer them and earn up to USD 100 for every successful hire.Fun virtual events - We host monthly virtual events filled with games, holiday celebrations, and exciting prizes. It’s a great way to connect and recharge as a team.Kajae Spotlight bonus - Exceptional performance is recognized through our Kajae Spotlight program, where top performers earn cash rewards.Kajae Tribe and rewards platform - Engage with the whole team through our internal social platform and earn coins for participating. Use them to bid in our lively auctions for prizes like AirPods, Apple Watches, Starbucks gift cards, shopping or experience vouchers, and more.Continuing education opportunities - Access 100% free online courses through our university partners in the US. Earn academic credits that can go toward a Master’s or Graduate Degree—completely on us.All-expense paid summits - Top performers and tenured team members may qualify to attend our exclusive annual summits. So far, we’ve held summits in Palawan, Bohol, and Boracay (Philippines), Cusco (Peru), and Punta Cana (Dominican Republic).About the RoleWe are seeking a highly technical and product-minded Senior Full-Stack Developer to architect, build, and scale a custom lead management and CRM ecosystem that sits at the core of the company’s operations.This is not a standard website development role. This position involves building a highly operational, multi-user platform that connects lead intake, qualification workflows, buyer delivery systems, BPO operations, signed retainer tracking, profitability analytics, and automated routing logic into one unified infrastructure.The ideal candidate is someone who thrives in complex systems, enjoys solving operational bottlenecks through engineering, and can independently own both backend architecture and frontend execution. You should be comfortable building scalable systems from the ground up, integrating multiple moving parts, scraping difficult data sources, and creating highly reliable workflows that directly impact revenue generation and operational scalability.This role requires a strong builder mentality, high ownership, and the ability to move fast while maintaining system reliability and scalability.ResponsibilitiesCRM & Lead Lifecycle Platform DevelopmentDesign and develop a centralized lead lifecycle management systemBuild infrastructure that tracks leads from source through signed retainer and dispute resolutionCreate complete audit trail functionality with full activity loggingDevelop lead deduplication and validation systemsBuild lead assignment and routing workflowsImplement document, note, and call attachment functionalityEnsure full operational visibility across the lead pipelineMulti-Portal System ArchitectureBuild and maintain separate portal environments for multiple user typesDevelop role-based authentication and permission systemsCreate dashboards tailored to internal admin teams, buyers, vendors, BPO teams, and LSO teamsEnsure each stakeholder group can independently operate within the platformImprove usability and workflow efficiency across all user environmentsAutomated Lead Routing & Delivery SystemsBuild automated routing systems based on business logic and operational rulesDevelop routing workflows using geography, case type, lead quality, buyer caps, and vendor limitationsImplement automated assignment to BPO teams and buyersBuild failover logic and backup routing systemsCreate configurable cap management systemsOptimize lead delivery speed and operational reliabilityFinancial Tracking & Profitability InfrastructureDevelop lead-level profitability and financial tracking systemsBuild revenue and cost attribution logic across operational entities, including vendors, media buyers, BPOs, and LSOsImplement margin calculation systems per lead and buyerBuild dispute and credit adjustment functionalityCreate reporting dashboards for profitability visibility and operational analyticsSigned Retainer & Inventory Management SystemsDevelop a retainer tracking infrastructure from pending to accepted or rejected statusBuild document upload and storage systemsAssociate retainers directly to leads and buyersImplement inventory visibility across all signed retainersCreate traceability systems connecting retainers back to original lead sourcesBuild LSO performance tracking and reporting functionalityData Scraping & Systems IntegrationScrape and aggregate difficult or non-standard data sourcesBuild integrations across internal and third-party systemsConnect operational workflows into one unified ecosystemDevelop APIs and backend services supporting platform scalabilityMaintain data consistency and synchronization across systemsTroubleshoot complex integration and automation issuesBackend Engineering & InfrastructureDesign scalable backend architecture and database structuresBuild secure APIs and internal servicesOptimize system performance, reliability, and scalabilityImplement logging, monitoring, and error handling systemsEnsure data security and operational integrityMaintain high availability and system uptimeFrontend Development & User ExperienceBuild clean, responsive, and operationally efficient user interfacesDevelop dashboards and workflow management toolsImprove platform usability across different stakeholder groupsCreate a scalable frontend architecture for long-term maintainabilityCollaborate on product improvements and workflow optimizationRequired Qualifications5+ years of experience as a Full-Stack Developer or Software EngineerStrong experience building custom CRM or operational platformsAdvanced backend development experienceStrong frontend development skillsExperience building scalable multi-user systemsExperience with workflow automation and business logic implementationStrong experience with APIs, integrations, and system architectureExperience working with relational databases and complex data structuresExperience building authentication and role-based permission systemsStrong understanding of system scalability and performance optimizationExperience scraping and processing difficult or large-scale datasetsAbility to independently architect and execute technical solutionsStrong debugging and troubleshooting abilitiesExcellent communication and documentation skillsPreferred QualificationsExperience building lead management or legal-tech platformsExperience with high-volume operational systemsExperience with financial reporting or profitability systemsExperience building multi-portal SaaS environmentsFamiliarity with call center or BPO workflowsExperience with cloud infrastructure and DevOps practicesExperience with automation pipelines and event-driven systemsStrong understanding of operational analytics and workflow optimizationStartup or fast-scaling company experience preferred