Java Developer

Job Title : Java Backend Developer

Experience : 3 to 6 Years

Locations : Bangalore / Gurgaon (Hybrid – 3 Days Work From Office)

Shift Timings : 11:00 AM – 8:00 PM IST

Notice Period : Immediate to 15 Days Only

Job Description :

We are looking for experienced Java Backend Developers with strong expertise in building scalable microservices-based architectures. The ideal candidate should have hands-on experience with Spring Boot, containerized deployments, and DevOps tools.

✅ Must-Have Skills :

• Java – Strong programming skills in core Java.
• Spring Boot (2.x / 3.x) – Deep understanding of microservices architecture and patterns.
• Microservices – Design and implementation experience.
• Kubernetes – Experience deploying and managing microservices
• Jenkins & Maven – Build and CI/CD pipeline experience
• PostgreSQL – Experience with relational database management

✨ Good-to-Have Skills :

• Git – Source control management
• CI/CD Pipeline Tools – End-to-end pipeline automation
• Cloud & DevOps Knowledge – Experience with cloud-based deployments

Java Developer – Job Description Wissen Technology is now hiring for a Java Developer - Bangalore with hands-on experience in Core Java, algorithms, data structures, multithreading and SQL. We are solving complex technical problems in the industry and need talented software engineers to join our mission and be a part of a global software development team. A brilliant opportunity to become a part of a highly motivated and expert team which has made a mark as a high-end technical consulting. Required Skills: • Exp. - 4 to 7 years. • Experience in Core Java and Spring Boot. • Extensive experience in developing enterprise-scale applications and systems. Should possess good architectural knowledge and be aware of enterprise application design patterns. • Should have the ability to analyze, design, develop and test complex, low-latency client facing applications. • Good development experience with RDBMS. • Good knowledge of multi-threading and high-performance server-side development. • Basic working knowledge of Unix/Linux. • Excellent problem solving and coding skills. • Strong interpersonal, communication and analytical skills. • Should have the ability to express their design ideas and thoughts. About Wissen Technology: Wissen Technology is a niche global consulting and solutions company that brings unparalleled domain expertise in Banking and Finance, Telecom and Startups. Wissen Technology is a part of Wissen Group and was established in the year 2015. Wissen has offices in the US, India, UK, Australia, Mexico, and Canada, with best-in-class infrastructure and development facilities. Wissen has successfully delivered projects worth $1 Billion for more than 25 of the Fortune 500 companies. The Wissen Group overall includes more than 4000 highly skilled professionals. Wissen Technology provides exceptional value in mission critical projects for its clients, through thought leadership, ownership, and assured on-time deliveries that are always ‘first time right’. Our team consists of 1200+ highly skilled professionals, with leadership and senior management executives who have graduated from Ivy League Universities like Wharton, MIT, IITs, IIMs, and NITs and with rich work experience in some of the biggest companies in the world. Wissen Technology offers an array of services including Application Development, Artificial Intelligence & Machine Learning, Big Data & Analytics, Visualization & Business Intelligence, Robotic Process Automation, Cloud, Mobility, Agile & DevOps, Quality Assurance & Test Automation. We have been certified as a Great Place to Work® for two consecutive years (2020-2022) and voted as the Top 20 AI/ML vendor by CIO Insider. 

Job Title: Senior Linux Kernel Engineer

Experience: 5–10 Years

Location: Bangalore / Chennai

Domain: Enterprise Linux / Kernel Development

Job Summary

We are seeking a highly skilled Senior Linux Kernel Engineer with deep expertise in kernel development, debugging, and performance optimization. The role involves working on enterprise-grade Linux distributions, kernel lifecycle management, security patching, and low-level hardware integration.

Key Responsibilities

1. Kernel Lifecycle & Maintenance

• Lead kernel upgrade strategies (e.g., LTS migrations such as 5.15 → 6.x) while ensuring stability and compatibility.
• Perform patch porting across kernel versions, resolving API and dependency conflicts.
• Track and mitigate security vulnerabilities by monitoring CVEs and upstream sources (e.g., LKML).
• Backport critical fixes to production kernels without impacting system stability.

2. Debugging & System Stability

• Act as an escalation point for kernel panics and system crashes.
• Perform post-mortem analysis using kdump, crash, and gdb.
• Debug early boot issues (UEFI, initramfs, kernel initialization).
• Conduct performance analysis using eBPF, ftrace, and perf to optimize system behavior.

3. Driver Development & Hardware Integration

• Design, develop, and maintain device drivers (network, storage, GPU, or character devices).
• Work closely with hardware through DMA, interrupts (MSI-X), and register-level programming.
• Maintain out-of-tree drivers using DKMS or similar frameworks.
• Ensure compatibility of drivers across kernel updates.

Required Technical Skills

• Programming: Strong expertise in C (mandatory) and C++
• Kernel Internals: Deep understanding of:
• Virtual File System (VFS)
• Memory Management (MMU, Paging)
• Process Scheduler
• Linux Networking Stack
• Debugging Tools:
• kdump, crash, gdb
• kprobes, trace-cmd, ftrace
• perf, valgrind
• Hardware debugging tools (JTAG, Serial Console)
• Build Systems:
• Kbuild, Makefiles
• Kernel packaging (RPM/Debian)
• Security:
• Experience with CVE patching and backporting
• Knowledge of SELinux/AppArmor
• Kernel hardening (FIPS, KSPP)

Preferred Skills

• Experience contributing to open-source kernel projects
• Familiarity with Linux Kernel Mailing List (LKML) workflows
• Exposure to enterprise Linux distributions (RHEL, Ubuntu, SUSE)
• Experience with performance tuning and system optimization at scale

1. Core Programming (C Language)

• Must have strong hands-on experience in C programming
• Comfortable with pointers, memory management, and low-level concepts

2. Kernel Internals Expertise

• Should have worked in at least one subsystem:
• VFS / File Systems
• Memory Management
• Scheduler / Networking

3. Debugging & Crash Analysis

• Experience handling kernel panics
• Hands-on with vmcore analysis tools

4. Security & Patching

• Understanding of CVE fixes and backporting

5. Driver Development

• Experience in writing or maintaining device drivers

6. Performance & Advanced Debugging

• Exposure to eBPF, ftrace, perf

7. Hardware-Level Understanding

• Knowledge of DMA, interrupts, hardware interaction

Soft Skills

• Strong analytical and problem-solving abilities
• Excellent communication skills
• Ability to work independently and in collaborative environments
• Quick learner with adaptability to new technologies

• Experience in Spring Boot, Jenkins, Git, Hibernate, Kubernetes, and Docker

• Experience in the development of scalable and extensible systems using Java

• Proficiency in Database technology such as MySQL, Oracle and MongoDB

• Routines Sync & Async

• Solid and fluent understanding of algorithm and data structures

• Excellent software design, problem-solving and debugging skills

• Demonstrated high ownership in previous projects

• Excellent Communication Skills

• Good understanding of Elastic Search, Redis

• Experience working in the cloud environment, preferably AWS*.

• Write unit tests and run automated tests through CI/CD

• Ability to learn new and existing technologies

• Experience in building cloud SaaS or PaaS solutions/products

Job Title: Java Team Lead

Experience: 4.5 to 8 years

Notice Period: Up to 30days (Negotiable)

Job Description :

• Experience in Java/J2EE technologies - design development of high-volume, high-performance, high-availability, service-oriented applications
• Design and govern the reusable accelerators, design patterns and reusable technical components (e.g. error handling, logging etc.)
• Strong knowledge in developing scalable web applications using Spring Boot with JDBC, JPA, Security,  RESTful Web Services
• Experience in front end development using HTML5, JQuery, React JS or Angular
• Research and implement new tools, frameworks and patterns to build a hybrid cloud applications
• Strong knowledge in Database – MySQL / PostgreSQL
• Knowledge of deploying applications in Ubuntu on Cloud Infrastructure
• Knowledge of Docker and Kubernetes for automatic application deployment will be an added advantage
• Lead a team and provide technical knowledge to team members during development

Roles & Responsibilities

• Understand the Requirement
• Convert them into Document
• Deliver the Work Product (software components / modules) with Quality
• High level design & Defining Architecture
• Following Coding best practices

The database market is massive (the IDC estimates it to be $119B+ by 2025!) and MongoDB is at the head of its disruption. The MongoDB community is transforming industries and empowering developers to build amazing apps that people use every day. We are the leading modern data platform and the first database provider to IPO in over 20 years. Join our team and be at the forefront of innovation and creativity.

MongoDB is expanding our global team of consulting engineers to further our ongoing plans for worldwide growth!

MongoDB Professional Services works with customers of all shapes and sizes in all verticals, from tier-1 banks to small web startups, on a variety of interesting use cases from e-commerce platforms to trading systems to social media applications. Solve interesting problems, gain incredible cross-stack experience, work with the best and brightest people in the business, network with industry leaders, and see new places - all in a day’s work!

MongoDB consulting exists to support the development of our customers’ vision, accelerate customers’ time to value, and drive a multitude of customer adoption scenarios - from building new solutions to modernizing legacy applications or migrating to the cloud. Our consulting solutions ensure that organizations get the best out of MongoDB.

Be one of the recognized experts in this rapidly growing field in a high-growth software company successfully challenging the status quo of the database industry. 

Shift Timing

You will get an opportunity to work with Global customers (APAC, EMEA, and North America) So this would require you to work in monthly rotational shifts.

This role can be based out of our Gurugram/Bangalore Office or remotely in the India region.

Candidate Profile

We’re looking for a highly technical individual, with strong problem-solving and communication skills, and is comfortable working closely with customers. 

Our ideal candidate will have

• Excellent analytical, diagnostic skills, and problem-solving skills
• High motivation for a role that combines deep technical and customer-management dimensions
• Confidence speaking and presenting in a collaborative customer setting
• 4+ years of software development/consulting/support experience, preferably in a number of distinct industries/verticals
• Familiarity with enterprise-scale software architectures, application development methodologies, and software deployment and operations
• Competence in at least one of the following languages (in no particular order): Java, C#, Python, Node.js (JavaScript), Ruby, Go.
• Experience with databases such as MongoDB, Oracle, MS SQL Server, PostgreSQL
• Familiarity with Linux diagnostics and tuning; Windows tuning knowledge is a plus
• Should have the strong capability with, minimally, both English and any local language - as necessary

As a core member of the MongoDB Professional Services team, you will

• Contribute to helping migrate customers from self-hosted MongoDB on-prem/cloud to Atlas
• Contribute to customer implementations at any or all phases of the application lifecycle: portfolio assessment, application planning, and design, deployment architectures, development and build, integration and release configuration, system testing, production operations, application optimization, and best practices adoption
• Work as part of a wider delivery team comprising fellow consulting engineers, project managers, and account teams
• Cultivate your individual MongoDB reputation as a trusted advisor to guide MongoDB and our customers into the future
• Partner with Product and Engineering teams to influence the direction of the MongoDB product roadmap

Success Measures

As a Consulting Engineer, you will be successful in this role when you can execute the following

• Become a field expert in “everything MongoDB”
• Communicate complex technical proposals simply and convincingly to a wide range of audiences
• Gain a reputation as a trusted advisor with your clients, large and small
• Ensure your client’s success with their MongoDB endeavors
• Maintain the required level of billable utilization
• Influence MongoDB product development by contributing experience from the field
• Successfully communicate the product roadmap to external clients
• Constantly work on improving yourself, our products and our team

Do you know, Why MongoDB is a fantastic place to work and build your career?

• Top NoSQL database in the world
• Largest Ecosystem and the fastest growing database in the world
• Close to 26,800 customers in more than 100 countries and over 175+ million downloads
• Sequoia Capital and a number of other Top VC firms have invested in MongoDB. Sequoia Capital calls us out as one of their flagship portfolios; Sequoia has also invested in Apple, Google, Youtube, and WhatsApp
• 9-figure revenue company, with very high double-digit growth rates  
• Be a part of the company that’s reinventing the database, focused on innovation and speed
• Enjoy a fun, inspiring culture that is engineering focused
• Work with talented people around the globe
• Learn, contribute, and make an impact on the product and community

Life at MongoDB

Our India office culture

• 300+ people, with teams in Sales, Engineering, HR, Finance, IT & Marketing
• Regular group outings and opportunities to get to know your colleagues
• Employee affinity groups

 Our Benefits

• Competitive salary and equity
• Comprehensive Health cover, dental cover, travel insurance & Life Insurance.
• Free lunch twice per week and a fully stocked kitchen with healthy and sweet treats in office.
• Macbooks are company standard
• 26 weeks Maternity & 20 Paternity leave to spend time with new arrivals

let’s check out the below link to know more about the role and Flex Consulting Team in India:

https://www.mongodb.com/blog/post/meet-our-growing-flex-consulting-team

To drive the personal growth and business impact of our employees, we’re committed to developing a supportive and enriching culture for everyone. From employee affinity groups to fertility assistance and a generous parental leave policy, we value our employees’ wellbeing and want to support them along every step of their professional and personal journeys.https://www.mongodb.com/blog/channel/culture"> Learn more about what it’s like to work at MongoDB, and help us make an impact on the world!

MongoDB is committed to providing any necessary accommodations for individuals with disabilities within our application and interview process. To request an accommodation due to a disability, please inform your recruiter.

MongoDB is an equal opportunities employer.