Full-Stack Developer – Team Lead

SOFTSWISS; Warszawa; Remote; PLN 180,000 - 240,000; Full time

Job summary

A leading technology company in Warsaw is seeking a skilled Full-Stack Team Lead to guide a development team. You'll drive technical excellence and ensure smooth delivery through mentorship and leadership. The ideal candidate has over 5 years of experience with JavaScript, TypeScript, and Node.js, alongside strong knowledge of modern web standards. This position offers remote work opportunities and additional benefits including private insurance and training programs.

Benefits

Full-time remote work opportunities

Private insurance

Flexible working hours

Comprehensive Mental Health Programme

Training and workshops

Qualifications

• 5+ years of production experience with JavaScript and TypeScript in Node.js environments.
• 1+ years of experience as a Team Lead or Tech Lead.
• Deep understanding of modern browser internals.
• Ability to write clean, testable code.

Responsibilities

• Provide leadership and mentorship to the development team.
• Allocate tasks based on team members’ strengths.
• Participate in hiring and onboarding new team members.
• Conduct risk assessments and improve product quality.

Skills

JavaScript (ES6+)

TypeScript

Node.js

HTML5

CSS3

Networking fundamentals

UX awareness

Tools

Webpack

Docker

GitLab CI

mitmproxy

Burp Suite

Job description

Overview:

SOFTSWISS is growing, and we are seeking a skilled Full-Stack Team Lead to join our team. If you are driven by excellence and share our values, we would love to hear from you.

About Product:

SOFTSWISS Game Aggregator
A fast and cost-effective solution that allows you to integrate and manage casino gaming content easily

Learn More

Purpose of the role:

We are looking for an experienced Full-Stack Team Lead who will guide a development team, drive technical excellence, and ensure smooth, predictable delivery. The ideal candidate has strong expertise in JavaScript/TypeScript, Node.js, modern frontend frameworks, and a deep understanding of browser internals, networking, and web performance.

Key responsibilities:

Team Leadership & People Management

• Provide leadership, mentorship, and day-to-day support to the development team.
• Allocate tasks based on team members’ strengths and expertise.
• Participate in hiring, conduct technical interviews, and onboard new team members.
• Give probation and performance review feedback, including addressing performance issues.
• Identify process bottlenecks and introduce engineering best practices to enhance team efficiency.
• Conduct risk assessments and develop mitigation strategies for feature delivery.
• Work in a fully agile environment (Scrum) alongside senior engineers and business stakeholders.
• Improve overall product quality through systematic engineering improvements.
• Participate in code reviews, backlog grooming, and retrospectives.
• Collaborate with product, infrastructure, and business teams to ensure smooth delivery.

Required Experience:

• 5+ years of production experience with JavaScript (ES6+) and TypeScript in Node.js environments.
• 1+ years of experience as a Team Lead or Tech Lead.
• Deep understanding of vanilla JavaScript and modern browser internals (DOM, lifecycle, JS runtime, resource loading, HTTP/2, QUIC, CORS, CSP, WebSockets, Service Workers).
• Hands‑on experience analyzing or reverse‑engineering client‑side applications (minified code, obfuscation, reproducing business logic, network trace analysis).
• Proficiency with proxy/MITM tools (mitmproxy, Charles, Burp Suite) or programmatic interception libraries (http-proxy, undici hooks).
• Strong understanding of networking fundamentals (TCP/IP, TLS, DNS, proxying protocols, traffic encryption).
• Solid knowledge of HTML5, CSS3, and responsive UI practices.
• Familiarity with Webpack/Vite, Babel, Docker, GitLab CI, semantic versioning, and OpenAPI specifications.
• Ability to write clean, testable, and maintainable code.
• Strong UX awareness with attention to performance and accessibility.
• Confident Git workflow, code reviews, and collaborative development practices.
• Strong knowledge of website vulnerability analysis and security principles.

Nice to have:

• Experience with Nginx (reverse proxying, caching, load balancing).
• Experience designing or reviewing high-load systems (10k+ RPS).
• Familiarity with WebAssembly and static analysis tools (webpack-bundle-analyzer, source-map-explorer).
• Experience with cloud providers (AWS, GCP) and their load-balancing technologies.
• Practical experience with React 18 and state management libraries (Redux-Saga, MobX, Zustand).

Our Benefits:

• Full-time remote work opportunities and flexible working hours.
• Private insurance.
• Additional 1 Day Off per calendar year.
• Sports program compensation.
• Comprehensive Mental Health Programme.
• Free online English lessons with a native speaker.
• Generous referral program.
• Training, internal workshops, and participation in international professional conferences and corporate events.