Senior Full Stack Developer (Node.js/ReactJS)

Sigma Software Group is a global IT consulting company that provides top-quality custom software development, graphic design, testing, and support services to a wide range of industries.

Sigma Software

Employee count: 1001-5000

Ukraine only

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Design, develop, and maintain scalable applications across front-end and back-end layers
Develop robust back-end services and APIs (REST/GraphQL) using Node.js
Build responsive, user-friendly UIs using ReactJS
Collaborate closely with data engineers and ML teams to integrate AI features and data-driven logic into the product
Optimize application performance, scalability, and reliability in a cloud environment
Implement best practices for security, CI/CD, testing, and code quality
Work with product and design teams to translate business requirements into technical solutions
Take ownership of features from ideation to deployment and monitoring in production
Stay up to date with emerging technologies and contribute to technical decision-making and innovation within the team

5+ years of professional experience with JavaScript, including modern frameworks and tools
Expert proficiency in Node.js for scalable back-end services and APIs
Expertise in ReactJS for modern, responsive front-end interfaces
Experience designing and implementing Data APIs for efficient workflows
Familiarity with VectorDB or similar vector databases for AI/ML applications
Hands-on experience with AWS or GCP, including deployment and management
Strong knowledge of RESTful APIs, microservices, and database systems (SQL/NoSQL)
Upper-Intermediate level of spoken and written English

WILL BE A PLUS

Experience with Model Context Protocol (MCP) for AI model interactions
Familiarity with workflow automation tools such as Langflow or n8n
Knowledge of DevOps practices, CI/CD pipelines, or containerization (Docker, Kubernetes)

PERSONAL PROFILE

Strong problem-solving skills
Attention to detail
Ability to work independently
Excellent communication and collaboration skills

We are looking for a Senior Full Stack Engineer to join one of our teams and help us build great products for our clients.

Join a globally recognized company, where innovation meets impact. With a team of seasoned professionals and a culture built on excellence, we deliver top-tier solutions that shape industries and drive meaningful results.

Become part of a company where your expertise is valued, your voice is heard, and your career is empowered!

CUSTOMER

Our client is a global content and information company shaping the future of media and data. With a century-long legacy and a strong focus on innovation, the team builds trusted experiences and tools that inform, inspire, and empower millions of people worldwide.

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About the job

Apply before

Apr 02, 2026

Posted on

Feb 01, 2026

Job type

Full Time

Experience level

Senior

Location requirements

Ukraine

Hiring timezones

Ukraine +/- 0 hours

About Sigma Software

Learn more about Sigma Software and their company culture.

View company profile

At the heart of Sigma Software Group lies a culture deeply rooted in Scandinavian values, emphasizing mutual respect, transparency, and a minimal hierarchy. This foundation fosters an environment where every voice is heard and valued, empowering our team of over 2000 IT experts to innovate and excel. Since our inception in 2002, our mission has been to build long-term, synergistic relationships not just with our clients, but with our employees as well. We believe that the key to delivering top-quality, value-adding IT services is a team that feels supported, inspired, and driven by a shared passion for finding better solutions. Our culture is one of perseverance, coupled with exceptional client management and strong engineering principles, which has been the cornerstone of our success and sustained growth on the global stage.

Our commitment extends beyond delivering cutting-edge software solutions. We are dedicated to nurturing the growth of the IT ecosystem through our educational platform, Sigma Software University, and fostering the next generation of tech innovators via our corporate venture fund, Sigma Software Labs. This holistic approach reflects our core belief in the power of collaboration and knowledge sharing. We actively encourage our specialists to pursue professional development, offering a continuous education program and a multitude of knowledge-sharing events. This dedication to growth, combined with a flexible work-life balance and a strong sense of community, defines who we are. We are more than just a technology partner; we are a collective of passionate individuals working together to create a better tomorrow, driven by a constant quest for innovation and a commitment to making a positive impact on the world.

Tech stack

Learn about the tools and technologies that Sigma Software uses to build, market, and sell its products.

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JavaScript

iOS

Protobuf

Blockchain

Google Cloud Platform

Docker

Sigma Software employees can create an account to update this tech stack.

Employee benefits

Learn about the employee benefits and perks provided at Sigma Software.

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Discount program

Access to a discount program.

Flexible schedule

Organize your work schedule in a way that suits you.

Remote or office work

You can choose to work from one of our outstanding offices or remotely.

Legal support

24/7 call center for legal advice and urgent lawyer assistance in case of an incident.

View Sigma Software's employee benefits

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