Domagoj – React, Typescript, AWS

Deep-tech platform developing AI-powered products for cybersecurity, life sciences, advanced sensing, and quantitative modeling to address complex scientific, engineering, and business challenges.

• Joined the team as a Senior Frontend Engineer and moved into full-stack ownership within a few months to unblock delayed API work and support delivery across the product;
• Helped raise frontend engineering standards by driving Typescript and React best practices and organizing weekly knowledge-sharing sessions focused on code quality;
• Took ownership of backend development across a distributed system of multiple services, writing new API routes, models, and performance improvements across Python Flask, Kotlin, and Golang services;
• Led the integrations team and defined the architecture for adding external integrations with services including AWS, CrowdStrike, ServiceNow, Tanium, and Venafi;
• Designed a resilient integration layer that handled third-party failures, rate limits, and retries safely;
• Improved system throughput by redesigning synchronous processing into chunked parallel workflows executed through background queues;
• Worked extensively on asynchronous systems using Redis, Temporal, and Kafka to support long-running, parallel workloads across the platform;
• Optimized slow GraphQL queries by replacing inefficient SQLAlchemy-generated queries with raw SQL where needed, improving performance on complex joins;
• Continued to work across the application stack and gained practical AWS and Kubernetes experience.

Client-facing Electron desktop application designed to help freelancers discover and manage job opportunities through a fast, native desktop experience.

• Helped define and build the frontend foundation of the product, including Typescript, Webpack, CI/CD, Storybook, component structure, and shared engineering conventions;
• Built integrations with the company's GraphQL, authentication, and notification services, including an abstraction layer that supported local development, test mocking, and end-to-end verification without depending directly on live services;
• Owned ESLint configuration and helped maintain frontend code quality in a growing Typescript codebase;
• Improved the company's shared component library by fixing reusable component issues and resolving Typescript typing problems that affected multiple projects;
• Raised test coverage and supported code quality through code reviews, testing practices, and mentoring engineers on Typescript patterns;
• Built UX-sensitive frontend features for an animation-heavy desktop application where responsiveness and polish were important to the overall experience;
• Handled cross-platform desktop issues, including Windows-specific debugging.

Professional services automation platform for project management, resource planning, financial operations, and business intelligence, helping agencies and consultancies manage projects, teams, budgets, and profitability from a single platform.

• Led a staged Typescript migration of a large legacy JavaScript codebase, starting with test coverage, expanding into core modules, and making Typescript the default for new feature development;
• Introduced a pragmatic ESLint setup for a legacy JavaScript codebase by relaxing overly strict defaults, then enabling rules incrementally as the team fixed existing issues and improved the codebase;
• Worked on refactoring a large, central part of the application used across the product, breaking a roughly 1,000-line class into smaller, focused modules that were easier to understand and maintain;
• Improved code reliability and day-to-day maintainability by making heavily used parts of the frontend easier to reason about, test, and change safely;
• Delivered multiple product features in collaboration with product and design teams across business-critical workflows;
• Mentored two junior engineers through onboarding, code reviews, and pair programming, improving ramp-up time and overall code quality;
• Helped drive Typescript adoption across a large-scale production application used for agency management;
• Built and maintained frontend functionality for a complex application handling structured data and operational workflows.

Enterprise digital product developed for a global client, focused on delivering scalable, cloud-native solutions with modern web and mobile technologies.

• Worked on projects including a cross-platform framework, a scientific conference platform, and an education application for seat reservation;
• Used JavaScript, TypeScript, React, SemaphoreCI, and QUnit;
• Served as Lead Engineer on a scientific conference platform, leading development of its video conferencing and webinar capabilities.