As a Senior Software Engineer – JavaScript, you will design, develop, and maintain complex, high-quality software solutions using modern JavaScript technologies. You will work in a cross-functional team delivering scalable, production-grade applications. The role requires deep expertise in JavaScript, advanced rendering models, asynchronous communication patterns, and conflict resolution in distributed systems
Key Responsibilities:
Design and develop complex front-end and full-stack JavaScript applications.
- Implement performant UI solutions using Virtual DOM-based frameworks.
- Contribute to technical and architectural decisions.
- Write reusable, testable, and maintainable code.
- Perform code reviews and mentor engineers
- Troubleshoot performance, scalability, and reliability issues.
- Collaborate with cross-functional stakeholders.
Promote engineering best practices
Qualifications
- Bachelor’s or Master’s degree in Computer Science or a related field, or equivalent practical experience.
- Minimum 5 years of professional software development experience
- Extensive expertise in JavaScript (language internals, event loop, async execution, performance)
- Strong understanding of Virtual DOM concepts, reconciliation, diffing, and render optimization.
- Deep knowledge of asynchronous messaging concepts, including event-driven systems, retries, idempotency, and eventual consistency
- Good understanding of conflict resolution algorithms such as optimistic concurrency control and versioning strategies
- Strong experience with React or equivalent frameworks
- Extensive experience with TypeScript
- Strong experience with state management (Redux / Redux Saga or equivalent)
- Good knowledge of component-based architecture and UI performance optimization
- Strong knowledge of HTML5, CSS3, and browser APIs
- Good experience with Node.js.
- Strong understanding of clean code, design principles, and testing.
- Experience working in Agile/Scrum environments.
- Good English communication skills, including client-facing contexts
Nice to Have:
- Experience with micro-frontend architectures (Module Federation or similar).
- Experience designing scalable front-end architectures.
- Backend experience using Java and Spring / Spring Boot.
- Experience with REST APIs and/or GraphQL.
- Cloud experience (Azure preferred).
- Experience with relational databases (e.g. PostgreSQL).
- Exposure to monitoring, profiling, and observability tools.
- Technical leadership or mentoring experience.
What we offer:
Opportunity to be part of a global organization.
Encouraging working atmosphere, engaging activities, and extra benefits (e.g. additional medical insurance (covers gym subscription), team events, outreach activities, and others);
Hybrid work model with remote work opportunities.
Open, modern, and ergonomic work environment when working from the office with the multicultural community.
Opportunity to grow professionally and personally (e.g. Udemy) and continuously develop within the domain.
The salary range for this position is from 4.485 to 5.950 Euro gross before taxes.*
*Salary offer for the candidate is determined based on the predefined salary ranges for the position and depends on the level of competence and experience of the candidate.
Cognizant, as a digital company, makes employee health and safety its top priority. With that in mind, we are implementing virtual hiring and work practices which means all interviews will be conducted online as well as live from the office
We will be looking forward to Your CV.
Only suitable candidates will be contacted within 7 days from application.
Stay up to date with our website https://www.cognizant.com/lt/en
We are an equal opportunity employer and value diversity at our company. We do not discriminate based on race, religion, color, national origin, sex, gender, gender expression, sexual orientation, age, marital status, veteran status, or disability status.
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What we offer
- The chance to work with impact. Here, you’re empowered to bring your biggest thinking to help our company and clients improve everyday life.
- Ownership over your career. Stay at the top of your game through our award-winning learning and development ecosystem. And when your ambitions change or we offer new opportunities, we help you pivot by providing reskilling, on-the-job learning and guidance to find new roles that might be a better fit.
- The opportunity to thrive on a high caliber team with heart. We celebrate each other’s experiences and perspectives and promote a sense of belonging through our affinity groups and diversity and inclusion initiatives.
- A comprehensive total rewards package, including a competitive salary and a pension plan with matching contributions.
- Flexible health and financial benefits to support you and your eligible dependents—from day one.
- True work-life balance. Be at your best through paid time off, flexible work arrangements, volunteering opportunities, social events, and so much more.
About us
Cognizant (Nasdaq: CTSH) is an AI Builder and technology services provider, building the bridge between AI investment and enterprise value by building full-stack AI solutions for our clients. Our deep industry, process and engineering expertise enables us to build an organization’s unique context into technology systems that amplify human potential, realize tangible returns and keep global enterprises ahead in a fast-changing world. See how at www.cognizant.com or @cognizant.
Other employment-related information
Cognizant is an equal opportunity employer. Your application and candidacy will not be considered based on race, color, sex, religion, creed, sexual orientation, gender identity, national origin, disability, genetic information, pregnancy, veteran status or any other characteristic protected by federal, provincial or local laws.
If you have a disability that requires reasonable accommodation to search for a job opening or submit an application, please email [email protected] with your request and contact information.
Language requirements vary depending on roles, but we ask that all candidates have basic English proficiency for company-wide communications purposes. For roles based in Quebec, professional English proficiency is required, as you’ll deliver services to and collaborate with stakeholders outside the province who may not speak French.