April 8, 2026
Senior Frontend Developer (Part-time; 100% remote)
Senior • Remote
100 - 145 USD/hr
Warsaw, Poland
Senior Frontend Developer (Part-time; 100% remote)
💰Salary: up to around $40 per hour
💻 100% Remote
🕦 Part-time: Around 10h per week, up to 10-15h/week, as needed
☑️ B2B contract/freelance
We are seeking a Senior Front-End Developer to work on the ongoing improvement, maintenance, and optimization of our extensive public-facing website. The role is focused on working with an existing, production-grade codebase built primarily with HTML, CSS, JavaScript, PHP and WordPress, under CloudFlare.
Requirements
Expert-level experience in front-end development, with a strong track record of working on long-lived or legacy codebases
Website performance optimization experience, web performance tooling and audits (e.g., Lighthouse, Google PageSpeed insights) experience.
Ability to work independently (along with a work history of independent work)
Excellent knowledge of JavaScript, HTML and CSS, with a clear understanding of responsive design principles
Basic understanding of SEO fundamentals, including performance factors, and search-engine-friendly markup
Experience working with extensive and legacy frontend systems
Strong attention to detail and a quality-focused mindset
Main Responsibilities
Optimize page load times and overall website performance using front-end techniques.
Working on bugfixes and optimization of a legacy front-end website built with JavaScript, HTML, CSS, and WordPress, ensuring performance, and stability.
Improve existing features and user-facing functionality through thoughtful, incremental enhancements rather than full rewrites.
Collaborate with internal developers, designers, management, and content teams to implement updates and refinements to existing pages and components.
Ensure cross-browser compatibility across the website.
Apply front-end SEO best practices, including performance optimization (most importantly), accessibility improvements, page structure, and Core Web Vitals.
Get to know DevsData:
We are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in international corporations as well as students of the best technical and business universities. Find out more: https://devsdata.com/
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Warsaw, Poland
17,000 - 22,000 PLN
🏢 Summary: Senior Backend Developer role focused on designing, developing and scaling a modern web platform using Python and Django. The position involves architectural decisions, performance optimization, async processing and integrations with external systems. Strong ownership of code quality and technical direction is expected. 🗂️ Requirements: Minimum 5 years of backend development experience, Strong knowledge of Python, Commercial experience with Django, Experience with Django REST Framework, Practical experience with PostgreSQL, Experience with Docker and Docker Compose, Knowledge of asynchronous processing (Celery, Redis, queues), Ability to design and document REST APIs, Experience with system architecture and scalability, Experience with external API integrations 📃 Skills: Python, Django, DRF, PostgreSQL, Docker, Redis, Celery, REST, API, Angular, CQRS, DDD 🏢 Description: Szukamy doświadczonego Senior Backend Developera , który pomoże nam rozwijać i skalować nowoczesną platformę webową. Jeśli Backend to Twoje naturalne środowisko, a architektura, jakość kodu i odpowiedzialność techniczna są dla Ciebie ważniejsze niż „feature factory” – zapraszamy. Zakres obowiązków: Projektowanie i rozwój Backendu w Pythonie ( Django / Django REST Framework ) Współtworzenie architektury systemu (monolit + integracje, async, background tasks) Optymalizacja wydajności i skalowalności aplikacji Integracje z systemami zewnętrznymi (API, webhooki, płatności, usługi third-party) Dbanie o jakość kodu: code review, testy, dobre praktyki Współpraca z frontendem (Angular) i zespołem produktowym Realny wpływ na decyzje technologiczne Wymagania: Minimum 5 lat doświadczenia w Backendzie Bardzo dobra znajomość Pythona i Django Doświadczenie z Django REST Framework Praktyczna znajomość baz danych PostgreSQL Doświadczenie z Docker / Docker Compose Znajomość zagadnień async (Celery, Redis, kolejki) Umiejętność projektowania API i pracy z dokumentacją Samodzielność, odpowiedzialność i techniczne myślenie Mile widziane: Doświadczenie w projektowaniu większych systemów (DDD, CQRS, wzorce projektowe) Praca z systemami legacy i ich stopniową refaktoryzacją Doświadczenie w edukacji online / platformach SaaS Znajomość Angulara (na poziomie współpracy z FE) Oferujemy: Realny wpływ na produkt i architekturę Pracę przy sensownym, długoterminowym projekcie Dużą autonomię techniczną Elastyczne godziny pracy i pracę zdalną Współpracę B2B lub UoP Wynagrodzenie adekwatne do doświadczenia Jeśli lubisz backend, który ma znaczenie , a nie tylko „kolejne endpointy” - odezwij się. Etapy rekrutacji: 1. Zaproszenie na video screening 2. Zadanie rekrutacyjne sprawdzające znajomość DRF 3. Rozmowa miękko-techniczna -> po ok. 5 dniach od odesłania zadania, po pozytywnej jego ocenie umawiamy spotkanie online (ok. 40-min.) + krótki test kompetencji logicznych (online 40 minut)