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senior full stack developer

senior java developer

STRABL

STRABL is looking for a Senior Java Developer to join our high-performing fintech engineering team. This role is ideal for someone who has built secure, scalable systems at a fast-moving fintech startup and is ready to help shape the future of financial infrastructure.You'll work on a modern tech stack, lead critical backend development, and play a central role in our product evolution. If you're excited by complex systems, ownership, and building things that matter &mdash; we'd love to talk.Key Responsibilities:<ul><li>Design, develop, and maintain backend services and APIs using Java (preferably Java 11 or newer) and the Spring ecosystem (Spring Boot, Spring Data, Spring Security).</li><li>Architect and manage distributed microservices using tools like Spring Cloud, Mongo, Mysql and Redis, ensuring scalability, resilience, and high performance.</li><li>Have knowledge and build the multi tenant systems</li><li>Collaborate closely with product, design, and QA teams to deliver features from concept to production in short release cycles.</li><li>Write clean, maintainable, and testable code with strong emphasis on domain-driven design, SOLID principles, and test automation (JUnit, Testcontainers, Mockito).</li><li>Integrate with third-party fintech services such as payment gateways, fraud detection systems, open banking APIs, and KYC providers.</li><li>Implement secure coding practices and ensure compliance with industry standards like PCI DSS, GDPR, and ISO 27001.</li><li>Deploy and monitor services using Docker, GitHub Actions, Prometheus, Grafana, and centralized logging tools (ELK, Loki, or Datadog).</li><li>Participate in technical design reviews and drive architectural decisions to improve codebase quality, system performance, and developer experience.</li><li>Mentor junior and mid-level engineers through code reviews, design sessions, and knowledge sharing.</li><li>Leverage cloud infrastructure (preferably AWS) to build and manage services using EC2, RDS, S3, Secrets Manager, and event-driven architecture (SQS, SNS, Lambda).</li><li>Stay up-to-date with fintech trends and challenges &mdash; prior experience at a fintech startup is a must.</li></ul>What We&rsquo;re Looking For:<ul><li>5+ years of professional experience building production-grade Java applications</li><li>Proven experience working in a fintech startup or high-growth financial product team</li><li>Strong understanding of multi-tenant, backend architecture, microservices, event-driven, and distributed systems</li><li>Deep knowledge of Java, Spring Boot, SQL/NoSQL (Mysql, MongoDB), REST APIs</li><li>Hands-on experience with secure API design, data encryption, and compliance protocols</li><li>Familiarity with DevOps practices, CI/CD pipelines, and container orchestration (Docker, K8s)</li><li>Comfortable with fast-paced environments, ambiguity, and high ownership roles</li><li>Excellent communication skills and a collaborative mindset and should be proficient in speaking/writing in English</li></ul>Nice to Have:<ul><li>Experience with event-driven systems, Kafka, or RabbitMQ</li><li>Familiarity with fintech flows like transaction reconciliation, payment orchestration, or virtual wallets</li><li>Exposure to OpenAPI, Swagger, or Postman collections</li><li>Experience with observability tools like Grafana or OpenTelemetry</li></ul>Why Join STRABL?<ul><li>Competitive salary with performance-based bonuses</li><li>Attractive equity options to share in the company&rsquo;s success</li><li>Flexible remote-first work culture</li><li>Flexible working hours to support a healthy work-life balance</li><li>Opportunity to work on cutting-edge fintech solutions that impact millions of users</li><li>A collaborative, inclusive team where your contributions make a difference</li><li>Continuous learning and professional development opportunities</li></ul>How to Apply:If this sounds like you, we&rsquo;d love to hear from you, but please take the time to read the job description carefully before applying. We&rsquo;re looking for people who are genuinely aligned with the role and excited by what we&rsquo;re building in the MENA region for the world.Apply here: https://forms.fillout.com/t/aWnSPDr9y2usJob Type: Full-timeExperience:<ul><li>Springboot: 5 years (Required)</li></ul>Language:<ul><li>English (Required)</li></ul>

Senior Java Developer

QuickStart Technologies, Inc.

Job description:Sr. Fullstack Developer (JAVA)Job Locations: PK - KarachiType: Regular Full-Time (3 Months Contract)Working hours: 12 pm &ndash; 9 pm Pakistan timeVision: Transforming how the world discovers, develops, and unleashes cyber talent.Mission: We&rsquo;re not just filling skills gaps&mdash;we&rsquo;re redefining how companies hire, grow, and retain the people who power their security future.At QuickStart, we are committed to upholding the following core values:Passion |Respect | Accountability | Innovation | Speed | Execution [ PRAISE ]Job SummaryWe are looking for a skilled and motivated Sr. Fullstack Developer (JAVA) with at least 3 years of hands-on experience in developing robust, scalable, and high-performance applications. You will play a key role in designing and building backend systems, APIs, and microservices that support mission-critical business functions.This is an excellent opportunity for a developer who is passionate about clean code, system architecture, and delivering high-quality software in a collaborative environment.Key Responsibilities<ul><li>Design, develop, test, and deploy high-quality Java applications</li><li>Build and maintain backend services using Spring Boot or other Java frameworks</li><li>Develop and integrate RESTful APIs for internal and external use</li><li>Collaborate with frontend developers, DevOps, QA, and product managers</li><li>Optimize performance and scalability of applications</li><li>Hands-on experience with AI-assisted development tools such as GitHub Copilot and ChatGPT</li><li>Follow Agile development practices and participate in daily stand-ups</li></ul>Required Skills &amp; Qualifications<ul><li>3+ years of professional experience in Java development</li><li>Strong understanding of Core Java, OOP principles, and design patterns</li><li>Hands-on experience with Spring Boot, Spring MVC, and Spring Data</li><li>Experience in building RESTful web services</li><li>Proficiency in SQL and relational databases like MySQL, PostgreSQL, or Oracle</li><li>Familiarity with Git or other version control systems</li><li>Basic understanding of Maven or Gradle</li><li>Experience with unit testing frameworks like JUnit or TestNG</li></ul>Preferred (Nice to Have)<ul><li>Experience with Microservices architecture</li><li>Exposure to Cloud platforms (AWS, Azure, GCP)</li><li>Familiarity with Docker or Kubernetes</li><li>Understanding of message queues (Kafka, RabbitMQ)</li><li>Prior experience in Agile/Scrum environments</li></ul>Education<ul><li>Bachelor&rsquo;s or Master&rsquo;s Degree in Computer Science, Software Engineering, or a related field</li></ul>Job Types: Full-time, Contract Contract length: 3 monthsPay: Rs275,000.00 - Rs300,000.00 per monthWork Location: In person

Sr. Fullstack Developer (JAVA)

Systems Limited

Summary: 
We are looking for a highly skilled Java Developer to oversee and drive the development of scalable, high-performance applications. The ideal candidate will have strong expertise in Java, Spring Boot, Microservices, and Cloud Technologies, along with a proven ability to lead development teams and deliver complex projects.
 
Key Responsibilities: 
Lead the design, development, and deployment of high-quality Java-based applications.
 Architect and implement scalable, secure, and high-performance microservices using Spring Boot.
 Drive best practices in coding, testing, and software development life cycle (SDLC) processes.
 Collaborate with cross-functional teams (Product, DevOps, QA) to define and deliver technical solutions.
 Mentor and guide junior developers, ensuring code quality through reviews and best practices.
 Oversee API development, database integration, and third-party system integrations.
 Ensure adherence to CI/CD pipelines, DevOps practices, and cloud deployment strategies (AWS/Azure/GCP).
 Stay updated with emerging technologies, industry trends, and bring innovative solutions to the team.
 
Key Requirements: 
8+ years of experience in Java development, with at least 2+ years in a leadership role.
 Expertise in Java 8+, Spring Boot, Spring MVC, Spring Security, Hibernate/JPA.
 Strong knowledge of Microservices Architecture, RESTful APIs, and event-driven systems (Kafka, RabbitMQ).
 Experience with Relational (MySQL, PostgreSQL) and NoSQL databases (MongoDB, Cassandra).
 Hands-on experience with Cloud platforms (AWS, Azure, GCP) and containerization tools (Docker, Kubernetes).
 Proficiency in CI/CD pipelines and DevOps tools (Jenkins, Git, Terraform).
 Strong problem-solving, analytical, and decision-making skills.
 Excellent communication, leadership, and stakeholder management skills.
 Hands-on experience with AI/ML integration in Java applications is a plus.

Senior Consultant - Application Development

Confiz

<div>We at Confiz are hiring for a Java Developer with 5+ years of experience. The ideal candidate will be a Java expert with a primary focus on building secure, scalable applications. They will also be responsible for maintaining existing systems, mentoring junior developers, and collaborating with cross-functional teams.
Responsibilities
<ul><li>Design, develop, and maintain secure, scalable applications using Java (11+) and Spring Boot.</li>
<li>Build robust RESTful and SOAP APIs as well as microservices for seamless integration.</li>
<li>Ensure best practices in design, architecture, and coding standards.</li>
<li>Work with JSON and XML for data interchange and handle serialization/deserialization.</li>
<li>Implement and manage encryption/decryption mechanisms (AES, RSA, TLS) for secure storage and communication.</li>
<li>Oversee production deployments, ensuring zero downtime and rollback mechanisms.</li>
<li>Manage CI/CD pipelines using Jenkins, GitLab CI, or GitHub Actions with automated testing and configuration management.</li>
<li>Develop database schemas, write optimized queries, and manage integrations with relational databases (MySQL, PostgreSQL, Oracle).</li>
<li>Familiarity with NoSQL databases such as MongoDB, Redis, or Cassandra is a plus.</li>
<li>Strong understanding of HTTP/HTTPS protocols, methods, and secure communication standards.</li>
<li>Implement unit, integration, and functional testing using frameworks like JUnit and Mockito.</li>
<li>Write and maintain thorough test cases to ensure quality and functionality.</li>
<li>Work closely with Product, QA, and DevOps teams to achieve project goals.</li>
<li>Mentor junior developers on coding, documentation, and testing best practices.</li>
</ul>
Required Skills
<ul><li>A strong candidate will have a bachelor&rsquo;s degree in computer science (or related discipline) with a minimum of 5 years of hands-on experience in Java.</li>
<li>Experience: 5+ years of hands-on experience in Java (preferably Java 11 or later).</li>
<li>Education: Bachelor&rsquo;s degree in computer science or related field.</li>
<li>Core Skills: Java, Spring Boot, Spring Security, Spring Data, Spring Cloud, REST/SOAP APIs, JSON/XML, Microservices, HTTP/HTTPS protocols, Encryption/Decryption (AES, RSA, TLS), JUnit, Mockito, Git.</li>
<li>Database: MySQL, PostgreSQL, Oracle; familiarity with NoSQL databases (MongoDB, Redis, Cassandra).</li>
<li>CI/CD Tools: Jenkins, GitLab CI, GitHub Actions.</li>
<li>Cloud: AWS experience is highly desirable.</li>
<li>Tools: Git, JIRA, Confluence, or similar collaboration tools.</li>
<li>Containerization with Docker and orchestration with Kubernetes.</li>
<li>Exposure to Agile/Scrum methodologies.</li>
</ul>
We have an amazing team of 700+ individuals working on highly innovative enterprise projects &amp; products. Our customer base includes Fortune 100 retail and CPG companies, leading store chains, fast-growth fintech, and multiple Silicon Valley startups. What makes Confiz stand out is our focus on processes and culture. Confiz is ISO 9001:2015, 27001:2013 &amp; 20000-1:2018 certified. We have a vibrant culture of learning via collaboration and making the workplace fun. People who work with us work with cutting-edge technologies while contributing success to the company as well as to themselves.</div>

Senior Java/Spring Boot Developer

Creative Chaos

<div>Job Summary 
A Senior Software Engineer for Java is an associate at Creative Chaos who is mainly responsible for developing server applications of various software platforms including but not limited to writing Restful APIs to be consumed by client applications. A senior software engineer makes sure that the functionality, security and performance of the server application is as per the design and is completely bug free. Senior engineers have a responsibility to mentor their juniors and build team strength through training.<h3 class="jobSectionHeader"> 
Duties &amp; Responsibilities</h3><ul>
<li>Analyze business requirements</li>
<li>Estimate assigned tasks</li>
<li>Write code and unit tests</li>
<li>Collaborate with other team members</li>
<li>Tune your code for enhanced security and performance</li>
<li>Maintain systems by fixing any existing issues</li>
<li>Update issue tracking software</li>
<li>Provide status updates</li>
<li>Communicate with client</li>
<li>Control versions of your code</li>
<li>Research new technologies</li>
<li>Lead a team of software engineers</li>
<li>Mentor team members through training and guidance</li>
<li>Upgrade skills and knowledge</li>
<li>Evaluate candidates for open positions</li>
</ul>Requirements<ul>
<li>BS degree in Computer Science/Software Engineering or similar relevant field</li>
<li>Minimum 3-7 years of related experience in the professional industry.</li>
<li>3-7 years of experience in Spring Boot &amp; Hibernate.</li>
<li>Good knowledge of MicroServices.</li>
<li>Experience working with tools like Git, Maven, JFrog, UDeploy.</li>
<li>Expertise developing enterprise-level web applications and RESTful APIs using MicroServices, with demonstrable production-scale experience.</li>
<li>Demonstrate strong design and programming skills using JSON, Web Services, XML, XSLT, PL/SQL in Unix and Windows environments.</li>
<li>Strong background working with Linux/UNIX environments.</li>
<li>Strong Shell scripting experience.</li>
<li>Must have experience with PostgreSQL as DB Engine, deployed on AWS</li>
<li>Working experience with Relational DB Skills for PostgreSQL + Terraforms.</li>
<li>Passion to stay on top of the latest happenings in the tech world and an attitude to discuss and bring those into play.</li>
<li>Strong agile/scrum development experience</li>
<li>Strong collaboration and communication skills within distributed project teams</li>
<li>Excellent written and verbal communication skills</li>
</ul>Benefits<ul>
<li>Paid Time Off</li>
<li>Work From Home</li>
<li>Health Insurance</li>
<li>OPD</li>
<li>Training and Development</li>
<li>Life Insurance</li>
<li>Exchange Program</li>
<li>Paid Certifications</li></ul></div>

Senior Software Engineer - Java

Stifftech Solutions Private Limited

Singletonet is looking to hire Java Developers to work on a large enterprise application built on Java 8/11, J2EE, and WildFly.The platform uses JSF, XHTML, PrimeFaces, RichFaces, Hibernate, jBPM, Jersey, and SQL Server, along with messaging queues, REST/SOAP services, and some Angular components.Requirements:<ul><li>Strong experience in Java (8/11/17), Java EE, JSF, Hibernate, and SQL Server.</li><li>Experience with Jersey, web services, and messaging queues.</li><li>Knowledge of Azure, Kubernetes, jBPM, Maven, Git, and CI/CD tools.</li><li>Familiarity with Angular is a plus.</li></ul>Job Type: Full-timePay: Rs100,000.00 - Rs200,000.00 per monthWork Location: In person

Senior Java Developers

PublishEX Solutions Pvt. Ltd.

Simpaisa is looking for a skilled Senior Full Stack Developer who is proficient in both backend and frontend development. You will be responsible for designing, developing, and maintaining scalable applications, ensuring seamless integration between server-side logic and user-facing interfaces.Key Responsibilities<ul><li>Design, develop, and maintain web applications with end-to-end ownership.</li><li>Implement server-side logic using Java (Spring Boot).</li><li>Build intuitive and responsive UIs using Angular or React.</li><li>Integrate APIs, databases, and third-party services.</li><li>Write clean, maintainable, and testable code following best practices.</li><li>Collaborate with designers, product managers, and other developers to deliver high-quality features.</li><li>Optimize applications for performance, scalability, and security.</li><li>Troubleshoot, debug, and upgrade existing systems.</li></ul>Requirements<ul><li>Bachelor&rsquo;s degree in Computer Science, Software Engineering, or equivalent experience.</li><li>6 years of professional experience as a Full Stack Developer or in a similar role.</li><li>Strong knowledge of Spring Boot (Java).</li><li>Proficiency in Angular and/or React.</li><li>Experience with relational and non-relational databases (MySQL, PostgreSQL, MongoDB).</li><li>Familiarity with REST APIs, and microservices.</li><li>Strong understanding of HTML, CSS, JavaScript/TypeScript.</li><li>Knowledge of version control systems (Git/GitHub/GitLab).</li><li>Adheres to coding standards and best practices.</li></ul>Nice to Have<ul><li>Exposure to cloud services (AWS etc).</li><li>Experience with CI/CD pipelines, containerization (Docker, Kubernetes) is a plus.</li><li>Experience in unit testing and integration testing.</li><li>Understanding of DevOps practices.</li></ul>Job Type: Full-timePay: From Rs250,000.00 per monthEducation:<ul><li>Bachelor's (Preferred)</li></ul>Experience:<ul><li>full stack: 4 years (Preferred)</li></ul>Work Location: In personApplication Deadline: 13/11/2025

Senior Full Stack Developer

Explore 695+ Senior java developer in Karachi this October. Find roles across top companies and apply now to boost your career.