Oleksandr K. — Full-stack Engineer (Vue + Node.js)

Full-stack Engineer, Healthcare

Duration: Apr 2025 - April 2026

Summary: Development of a multi-tenant healthcare platform from scratch with full ownership of system architecture, backend, frontend, and infrastructure, focusing on GDPR compliance and secure medical data handling.

Responsibilities:

• Designed PostgreSQL schemas and analytics-focused queries to support patient history tracking and progress analysis;
• Deployed and operated the system using containerized infrastructure with per-tenant CI/CD pipelines.
• Designed and built a multi-tenant healthcare platform from scratch, owning system architecture, frontend, backend, and infrastructure;
• Implemented silo-based multi-tenancy to ensure strict data isolation and compliance with GDPR and Swiss data protection requirements in clinical environments.
• Designed and implemented a dynamic game engine using runtime component loading, enabling rapid addition of new cognitive exercises without changes to core routing or logic;
• Built authentication and role-based access with a security-first, stateless design optimized for tenant isolation;

Technologies: TypeScript, JavaScript, PostgreSQL, Docker, CI/CD, Containerized Infrastructure.

Full-stack engineer, Fintech / Energy Tech SAAS (Noumena Digital AG)

Duration: Mar 2022 - Mar 2025

Summary:

• Contributed to a MiCAR-regulated EUR stablecoin platform, integrating blockchain, banking, and email services, as well as internal AI tooling.

Responsibilities:

• Developed core components of a MiCAR-regulated EUR stablecoin platform, supporting compliant access to on-chain financial infrastructure;
• Designed and implemented blockchain, banking, and email (SMTP) integrations, enabling reliable interaction between on-chain and off-chain systems;
• Integrated Noumena Protocol Language (NPL) into production workflows, reducing implementation complexity and improving automation;
• Worked closely with the NPL core team, providing implementation-driven feedback that influenced protocol features and developer ergonomics;
• Co-developed an internal, domain-specific AI assistant for the NPL language, enabling sales teams to create tailored product demos significantly faster and reducing demo preparation time from days to hours;
• Authored internal technical documentation and guides, improving onboarding quality and reducing dependency on tribal knowledge;
• Onboarded and supported new engineers, helping establish development patterns and best practices.
• Led the migration of two legacy applications from Vue 1/2 to Vue 3, resulting in a significant reduction in bundle size and improved page load performance;
• Led the development of a shared Storybook system, improving onboarding efficiency and reducing cross-team coordination overhead;
• Designed and developed a new feature prototype, contributing to the acquisition of 11 new business clients within the first 6 months;
• Reviewed and optimized the application’s map module, reducing monthly Mapbox costs by approximately 20%;
• Mentored a team of 3 engineers through 1:1s, code reviews, task breakdown, and estimation.

Technologies: TypeScript, JavaScript, Blockchain Systems, Banking APIs, SMTP, AI Tools, Vue.js, Vue 3, Storybook, JavaScript, Mapbox.

Full-stack Engineer, Folderly (Email SAAS)

Duration: Oct 2020 - Feb 2022

Summary: Worked on an email deliverability platform with real-time features and integrations with major email service providers.

Responsibilities:

• Developed core features of an email deliverability platform, including a free email warmup feature that contributed to a 16% increase in sales conversion;
• Designed and implemented integrations with major email providers (Mailgun, Outlook, IONOS), expanding platform integration coverage by 37.5%;
• Introduced real-time data updates using VueFire, increasing user engagement and session duration;
• Designed and built a high-traffic customer dashboard with email and SMS notification workflows;
• Redesigned and extended Firebase and backend API structures to support platform growth.

Technologies: JavaScript, Vue.js, VueFire, Firebase, SMTP, Email APIs.

Full-stack engineer, Marketplace (avtandilovna)

Duration: Feb 2019 - Aug 2020

Summary: Contributed to an early-stage startup by developing backend features and database structures.

Responsibilities:

• Designed and built core product features for an early-stage startup, including messaging, content (blog), and user feedback systems;
• Co-designed backend architecture and APIs, supporting core application workflows;
• Designed PostgreSQL schemas, procedures, and functions to support application data and business logic.

Technologies: PostgreSQL, SQL, Backend APIs.