Senior Full Stack Engineer (JavaScript)

Salary range: B2B - 40-42 E/h + VAT 💰

Ciklum is looking for a  Senior Full-Stack Developer to join our team full-time in Poland.

We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.

About the role:

As a Senior Full-Stack Developer, you will be a key member of a team focused on enhancing and integrating with our core Salesforce platform. You will participate in all stages of the development lifecycle — from ideation and design to architecture, implementation, deployment, and maintenance. Thisproject enhances trust and transparency on a global consumer review platform by detecting and preventing fraudulent activities, such as fake reviews, and ensuring policy compliance through AI, data analysis, and scalable fraud detection systems.

Responsibilities:

• Collaborate closely with Product, Design, and Data Science in a full ownership team

• Drive system design and technical decision-making

• Use TypeScript to develop scalable backend services and clean, reusable frontend components

• Build and maintain RESTful APIs and distributed cloud services

• Contribute to planning, implementing, and releasing new features

• Troubleshoot and resolve issues across the tech stack

• Write clean, maintainable, and testable code

• Actively participate in code reviews and team discussions

• Support and inspire the team with your technical expertise and problem-solving mindset

Requirements:

• 5+ years of hands-on experience in fullstack web development

• Strong knowledge of TypeScript

• Experience with AWS services (e.g., ECS, Lambda, SQS, SNS)

• Skilled in building and consuming RESTful APIs

• Experience working with NoSQL databases (e.g., MongoDB, DynamoDB) and relational databases (e.g., PostgreSQL)

• Familiarity with containerization using Docker

• Hands-on experience with DevOps practices and CI/CD pipelines

• Experience with monitoring and logging tools (e.g., CloudWatch, Datadog)

• Understanding of cloud infrastructure as code (e.g., CloudFormation)

• Strong problem-solving skills and attention to code quality

• Upper-intermediate or higher level of spoken and written English

Desirable:

• Experience with GCP and services like BigQuery

• Exposure to Python and Node.js

• Hands-on experience with .NET on the backend

• Frontend experience with React, Next.js, CSS Modules, SASS, or Styled Components

• Familiarity with event-driven architectures and microservices

• Experience in data analysis or fraud detection solutions

Personal skills: 

• Accountability: You take ownership and follow through on your responsibilities

• Drive: You're proactive and results-oriented, always seeking better ways to solve problems

• Self-development: You stay curious, seek feedback, and aim for continuous improvement

• Effective communication: You communicate your ideas clearly and collaborate effectively in a team

• Mentoring: You're open to helping less experienced team members and sharing knowledge

What`s in it for you?

• Strong community: Work alongside top professionals in a friendly, open-door environment

• Growth focus: Take on large-scale projects with a global impact and expand your expertise

• Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications

• Endless opportunities: Explore diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies

• Flexibility: Enjoy flexibility – full remote working possibilities

• Care: We’ve got you covered with company-paid medical insurance, mental health support, and financial & legal consultations

About us:

At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress.With delivery centers in Wroclaw and Gdansk, our 300+ professionals in Poland drive forward-thinking solutions for global clients. Join a community where collaboration sparks innovation—and your impact reaches millions.

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Explore, empower, engineer with Ciklum!

Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum.