Remote-first. AI-native. Self-organized.
For SaaS and product teams that need to ship or scale.
Senior engineers join your roadmap, speed up slow
products and own delivery to production.
Direct access to your engineers.
A lead engineer owns scope, timelines and releases, so you don’t need a separate PM.
Built for ownershipFrom architecture to production
AI-native. Human-led.Every decision owned by an engineer
Works in your time zoneRemote-first · agreed overlap hours
Healthcare, developer tools, real-time platforms.
Different challenges. The same ownership.
Developer analytics
Engineering intelligence platform: leaderboards, repository analytics, contributors, issues, search and filtering, and CSV export.
Real-time chat & community
Real-time chat and community platform with payments. Included Angular migrations from v7 to modern versions and a CI/CD pipeline.
Healthcare · Chrome Extension
Healthcare browser extension with complex reimbursement logic. Migrated from vanilla JS to Plasmo and React, with Chakra UI and automated tests.
More products we’ve worked on
React, Angular and Next.js interfaces. Accessible, responsive and built to stay maintainable.
Node.js, Express, tRPC and PHP. APIs, databases and the infrastructure behind your product.
Unit, integration and end-to-end tests. Confidence in every release, built into the workflow.
Practical AI integrations and AI-assisted engineering, with human review and accountability.
Cross-platform apps with React Native and web technologies. One connected product experience.
Strapi and content platforms that give your team control over publishing.
You bring the ambition. We bring the engineering judgment, clear communication and responsibility to move it forward.
Get to know Leo·SourceMid-level, senior, staff and lead engineers plan the work, communicate decisions and take responsibility for releases. You work directly with the people building your product; a lead engineer owns scope, timelines and releases, so a separate project manager is not required.
AI supports research, implementation and testing. Engineers review the output, check assumptions and own every production decision.
We agree on acceptance criteria, review code and run automated tests before release. Maintainable architecture helps your product evolve without unnecessary rework.
Direct communication, documented decisions and clear handoffs keep collaboration moving across time zones. We agree overlap hours, handoffs and response times with you up front.
JavaScript and TypeScript are our core. We choose frameworks, databases and cloud services around your product, existing codebase and delivery needs. Here is the core; the rest is on request.
Ukrainian developers and QA engineers, ready to work alongside your team. Work directly with the people responsible for architecture, implementation and quality.
Technical Lead / Frontend Architect
Staff · 16 years
Technical Lead / Full Stack Developer
Lead · 7 years
Senior Full Stack Developer
Senior · 6 years
Senior Full Stack Developer
Senior · 6+ years
Senior Frontend / Full Stack Developer
Senior · 6+ years
Senior QA Engineer / Test Automation Engineer
Senior · 4 years
Middle Full Stack Developer
Middle · 4 years
Frontend Developer
Middle · 4 years
Full-Stack PHP Developer
Senior · 6+ years
Angular Developer
Senior · 6+ years
Senior QA Engineer (Manual & Automation)
Senior · 5+ years
Middle React Developer
Middle · 4 yearsPractical notes on technical ownership, collaboration and building maintainable products.
2 min read
Replace hand-written pending, error and optimistic state with the built-in form primitives.
Read article2 min read
A Go-based compiler that is roughly an order of magnitude faster. What to expect in CI, editors and tooling.
Read article2 min read
What automatic memoization changes, how to adopt it incrementally and when manual hooks still matter.
Read articleLaunching a product, modernizing an application or adding engineering capacity? Share your goals, current stack and timeline. We’ll come back with scope, risks and a clear way to start.
Choose a time that works for you. Talk directly with our technical lead.
Start the conversation
