Software Engineer

September 1, 2026

Hybrid

Middle

Warsaw, Poland

Important before applying

This job has conditions that may affect your decision to apply

English is required

Description

Williams Lea is seeking a Software Engineer for a hybrid role in Warsaw. The position involves designing, building, and maintaining web applications, collaborating with product and design teams, and contributing to architectural decisions. It requires full-stack development skills with 3+ years of experience in modern technologies.

Responsibilities

Build responsive, accessible, high-performance interfaces using modern JavaScript frameworks
Translate UX/UI designs and wireframes into production-ready code
Optimise performance related to rendering, load times and SEO
Ensure compatibility across devices and browsers
Implement and maintain unit tests for front-end components
Develop and maintain robust, scalable RESTful APIs using C# and/or Python frameworks
Design and manage relational and non-relational databases
Implement secure authentication and authorisation (OAuth 2.0, JWT)
Integrate third-party APIs and services
Maintain unit tests for services, APIs and business logic
Contribute to system design discussions focused on scalability and maintainability
Manage CI/CD pipelines using GitHub Actions, Jenkins or CircleCI
Work with cloud providers to provision and operate infrastructure
Containerise applications using Docker and orchestrate via Kubernetes where appropriate
Write unit, integration and end-to-end tests to ensure quality standards
Participate in Agile ceremonies (planning, stand-ups, retrospectives, code reviews)
Share knowledge and support junior colleagues through mentoring
Document code, APIs and architectural decisions clearly and consistently

Requirements

Degree in Computer Science, Software Engineering or related field or equivalent experience
3+ years’ experience in full-stack or equivalent development roles
Proficiency in JavaScript/TypeScript and at least one major front-end framework (React preferred)
Back-end experience with Node.js, Python, Java or similar
Experience with SQL and NoSQL databases
Strong Git knowledge and familiarity with branching strategies
Experience with cloud platforms, containerisation (Docker) and CI/CD pipelines
Understanding of web security best practices (OWASP, HTTPS, CORS)
Ability to explain technical concepts to diverse audiences

Conditions

Work model: Hybrid in Warsaw
Schedule: 40 hours per week, Monday – Friday, 8.30am until 5:30pm with 1 hour unpaid lunch break
Benefits: 26 days holiday plus bank holidays (pro-rata for part time or fixed term roles)
Referral Scheme and career development opportunities

JavaScriptReactPythonbusiness servicesGraphQLKafkaDatadog

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