Senior JS Full Stack Engineer

SoftServe; Polska; Hybrid; PLN 369,000 - 583,000; Full time

Benefits offered by this job

Health coverage

Learning opportunities

Flexible work options

Job summary

SoftServe is seeking a senior full-stack engineer to design scalable cloud-native applications for retail analytics. You will work on full-stack features using React, Node.js/TypeScript, and AWS Lambda, shaping architecture for reliable, observable services.

You will implement REST and GraphQL integrations, ensure robust testing, and contribute to CI/CD improvements in a collaborative, multilingual team.

Qualifications

• 5+ years of commercial software development experience.
• Proficiency with React and Hooks, and Node.js with TypeScript.
• Experience building REST APIs and consuming GraphQL services.
• Knowledge of PostgreSQL and MongoDB with indexing basics.
• Hands-on AWS Lambda and API Gateway, including CORS basics.
• Strong testing mindset: unit, integration, and end-to-end testing.

Responsibilities

• Build end-to-end features across React and Node.js/TypeScript.
• Design scalable architectures and optimize frontend/backend performance.
• Develop REST APIs and integrate GraphQL services.
• Implement AWS Lambda functions and API Gateway configurations.
• Improve CI/CD pipelines and promote engineering best practices.
• Apply SOLID, clean architecture, and decoupled components.
• Use observability tools to troubleshoot and maintain production systems.

Skills

React with Hooks

Node.js

TypeScript

AWS Lambda

REST API

GraphQL

PostgreSQL

MongoDB

SQL/NoSQL optimization

CI/CD

Testing (unit/integration/e2e)

Observability (logs/metrics/tracing)

Terraform or IaC

Tools

React

Node.js

TypeScript

GraphQL

AWS (Lambda/API Gateway)

SQL (PostgreSQL)

NoSQL (MongoDB)

Terraform

Job description

In this role, you will design and build scalable full-stack applications, shaping architecture and delivering cloud-native tools that help retail teams detect stock issues, prioritize actions, and measure improvements in product availability. Your work turns operational and inventory data into intuitive products that help stores quickly identify discrepancies and improve on-shelf availability.

Responsibilities

• Build end-to-end product features across React, Node.js with TypeScript, and serverless components to deliver full-stack functionality
• Improve system performance, scalability, and maintainability by optimizing frontend and backend implementations and refining architectural design
• Implement REST APIs using Node.js and TypeScript and integrate with GraphQL services where required to support application functionality
• Develop AWS Lambda functions and configure Amazon API Gateway, ensuring proper CORS handling for secure and reliable service access
• Apply effective testing practices by implementing unit, integration, and end-to-end tests to maintain application reliability and quality
• Enhance application architecture by applying clean abstractions, SOLID principles, and reduced coupling across system components
• Use observability tools including logs, metrics, and tracing to troubleshoot issues and maintain production stability
• Contribute to CI/CD pipeline improvements, participate in code reviews, and promote engineering best practices across the team

Requirements

• 5+ years of commercial software development experience
• Strong proficiency with React, including practical use of Hooks such as useState, useEffect, useMemo, and useReducer while consistently applying the Rules of Hooks
• Solid understanding of React architectural patterns, including the ability to explain and compare Higher-Order Components and Hooks
• Strong proficiency with Node.js and TypeScript, including asynchronous programming with callbacks, Promises, async/await, and robust error handling within the Node.js async model
• Practical experience with building RESTful APIs and consuming GraphQL services in modern web applications
• Knowledge of SQL and NoSQL databases including PostgreSQL and MongoDB, with familiarity in indexing strategies and basic query optimization
• Hands-on experience with AWS Lambda, including configuration, handler signatures, API Gateway integrations, and CORS fundamentals
• Strong knowledge of software testing strategies, including applying the Test Pyramid with unit, integration, and end-to-end testing
• Hands-on experience with AI engineering and AI tools/harnesses
• Solid understanding of clean architecture principles, including dependency injection, abstraction, coupling and decoupling, and SOLID design principles
• Clear communication skills with Intermediate strong or Upper-Intermediate level of English for effective collaboration in a multicultural team
• Advanced experience with AWS ecosystem patterns such as API Gateway integrations, retries and DLQs, and event-driven architectures (would be a plus)
• Practical experience implementing GraphQL resolvers and schema stitching (nice-to-have)
• Familiarity with event-driven systems and messaging platforms such as Kafka or AWS EventBridge and Infrastructure as Code approaches such as Terraform or similar tooling (nice-to-have)

SoftServe is an equal opportunity employer. Qualified applicants will receive consideration regardless of race, color, ancestry, ethnicity, national origin, religion, sex, sexual orientation, gender identity or expression, age, citizenship, disability, health condition, marital or family status, veteran status, or any other characteristic protected by applicable law.

About us

We are a digital engineering and technology consulting company where expertise grows alongsidepeople. For more than 30years, we have been elevating technology: helping organizations navigate complex businesschallenges by combining deepengineering knowledge with thoughtful, research-backed innovation. Our teams work across keyareas: digitalengineering, data and analytics, Сloud, and AI/ML. In each, we deliver practical, scalablesolutions rooted in realbusiness needs and measurable human impact.

You bring your perspective and ambition. We create an environment where your work meetsclarity, confidence, andpurpose.

We offer

Work from home, from the office, or in a hybrid format that supports focus andcollaboration.

Competitive, market-based pay, benchmarked by role andlocation — plus health coverage, paid time off, wellness support, and learningopportunities.

Approachable leaders who communicate openly, keep teams close to the strategy, andsupport long-term planning.

Advanced tech communities

Stay close to AI/ML, Cloud, Quantum Computing, IoT, andRobotics communities, with projects built on modern frameworks.

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