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.
CogLT104
コグニザントのコミュニティ：
私たちは、互いを尊重し支え合う優秀な人材の集まりです。社員一人ひとりが成長し、力を発揮できるよう、エネルギッシュで協力的かつインクルーシブな職場環境を大切にしています。
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私たちについて：
コグニザント（NASDAQ: CTSH）は、AI builderおよびテクノロジーサービスプロバイダとして、AI投資を企業価値へとつなげるフルスタックのAIソリューションを提供しています。業界、業務プロセス、エンジニアリングに関する深い専門性を強みに、各企業固有のコンテキストをテクノロジーシステムに組み込み、人の力を最大限に引き出すとともに、具体的な成果の創出と、急速に変化する世界におけるグローバル企業の競争力維持を支援します。詳しくは、当社ウェブサイト www.cognizant.com をご覧ください。
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