Senior Full-Stack Software Engineer (React, Node.js)

Our family-style company is looking for a strong Senior Full-Stack Software Engineer (8+ years). This is a long-term, full-time position at a well-funded cybersecurity startup.

About the Role

The startup has raised over $100M and is post-Series B. The role requires deep expertise in both frontend and backend development, with a strong emphasis on frontend ownership. Excellent frontend skills are a must-have. Day-to-day work includes building and owning features end-to-end, primarily using React (Typescript, MUI), Node.js (TypeScript), and Python.

On the backend, the engineer is expected to work at a high level with both Python and Node.js (TypeScript, NestJS). The role involves maintaining and developing new features across multiple services (Python and TypeScript-based), database schema design and changes (PostgreSQL), and working with Kafka and Redis.

You’ll work closely with developers plus Team Leads, and PMs in a highly collaborative, Agile environment. High ownership and the ability to mentor other developers are a must.

What you’ll do:

• Full-stack feature ownership:  Primarily focused on React UI development, including building clean, reusable components within the design system, well-structured custom hooks, and end-to-end backend/API delivery.
• Core implementation areas: CRUD flows, PostgreSQL database work and Schema changes with SQLAlchemy (Python) and TypeORM (NestJS).
• Production-grade engineering: monitoring, debugging, performance optimization, and handling incidents/issues in real environments.
• Architecture work: designing systems or significantly evolving existing architectures with clear trade-off thinking (performance, scalability, cost, and maintainability).

What We’re Looking For:

• Core Languages: React, Node.js (TypeScript), Python.
• Frontend: React, MUI, react-hook-form, react-query, Storybook, Playwright.
• Backend & API: Node.js (TypeScript), Python, NestJS, Redis, Kafka, AWS SQS & SNS, AWS S3.
• Database & Storage: PostgreSQL, SQLAlchemy, Nest Repositories and TypeORM.
• Testing Standards: PyTest, Vitest, Playwright.
• Infrastructure & DevOps: AWS, GitHub Actions, Docker, Docker Compose, CI/CD pipelines, Kubernetes.
• Strong understanding of scalable systems and software architecture.
• Ability to mentor professionally mid- level developers.
• Prior startup experience (will be a strong advantage).
• Ownership of features end-to-end.
• Strong communication skills.

• Advanced English proficiency.

   

Nice to have:

• Technical curiosity and interest in cybersecurity are a strong bonus.

   

What we offer:

• A really promising long-lasting project (you will be proud of yourself).
• Sane and polite, but effective management.
• The best corporate culture (according to our teammates' opinions).
• Competitive salary and other stuff.
• Remote work, full time.

• Becoming not just another team member, but a part of UKAD with unique value and long-term relationships.

   

Some facts about UKAD to help you make a decision:
During 2022-2025, we only increased cooperation with our foreign partners.

UKAD combines benefits of family-sized companies, like no bureaucracy, easy access to the executives, with sustainable growth and vast opportunities.
Our company is strong enough to be not just a vendor but a tech partner. We can afford to choose customers that respect developers.
UKAD is one of the leading employers in Kharkiv, according to DOU.

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