Spring Boot Bug Fix & Features

@ambar

**Similar Spring Boot work** I recently worked on a Spring Boot project for Sustech Engineering (Australia). The project was already running, so my job was mainly to fix bugs and improve the existing code. Some of the issues I worked on: * Fixed JPA/Hibernate mapping problems which were breaking a few APIs. * Found places where Hibernate was making too many database calls and reduced them. * Cleaned up repository methods which were fetching much more data than required. * Checked slow queries using `EXPLAIN` and added indexes where needed. * Fixed some save/update issues in the service layer. * Improved logging for REST API calls so it became easier to find the actual problem when something failed. **How I usually work** First I try to reproduce the issue. If I can't reproduce it, I check the logs and add a few more logs if required. Then I enable Hibernate SQL logs and see what queries are actually running. If the problem is in the database, I check the query plan and indexes. I prefer fixing the root cause instead of adding a quick patch because otherwise the same issue comes back later. **Hotfix turnaround** If it is a production issue, I usually start working on it immediately. Small bugs can normally be fixed within a few hours. Bigger issues depend on the codebase, but I always keep the client updated on what I found and what I am doing next.

@onkarkulkarni8

Hi, I checked your "Spring Boot Bug Fix & Features" project and it looks like understanding the existing workflow will be important before making any changes. I've worked on similar PHP projects involving java, mysql, git, microservices, spring boot, hibernate, rest api and prefer delivering work in small milestones so everything stays easy to review and adjust if needed. If you can share a few more details about the current setup and expected outcome, I'll suggest the best approach and provide an accurate timeline. ⭐ 5.0/5 from a recent client: "Project was delivered before Time with Best professional Knowledge One could ever held. Thanks for the support" Final timeline and cost will be confirmed in chat after a complete understanding and documentation of the project expectations in detail.

@SamindaPeramuna

Hi, I am a JAVA developer with over 12 years of experience and please refer to my profile for my past work. I have worked on countless Spring Boot / Spring MVC projects over the years and I am 100% confident I can fix the issues you are having and add new features you request. However I would like to have a look at the existing source code before I can confirm the doability. Is it possible to have a look at the existing source code before starting work? Looking forward to hearing from you. Kind regards, Saminda

@denisSolution

Hi, It looks like the main challenge right now is getting the backend stable under real load while adding new functionality cleanly. I’ve worked on Spring Boot services where the biggest slowdowns came from unindexed queries and unmanaged Hibernate collections, so the first step would be profiling with VisualVM or YourKit to spot the obvious bottlenecks. For bug hunting I usually start with a failing test that reproduces the issue, then work backwards through the call stack—something similar to a recent Spring Boot service where a misconfigured transaction boundary was causing intermittent deadlocks. The new CRUD endpoints and API integrations can be added as separate controllers once the queries are under control; I’d keep the models thin and rely on Spring Data JPA projections to avoid fetching unnecessary data. For auth, Spring Security with JWT fits well if you want stateless tokens, or a simple session-backed approach if you prefer cookies. The trickiest unknown is how tangled the existing codebase is—if there are legacy JPA mappings or circular dependencies, refactoring could take longer than expected, so I’d scope the first week to diagnostics and a clear report before committing to fixes. Thanks, Denis.

@mobimubasir

Hello there, I have strong experience debugging and stabilizing Java 17/Spring Boot applications, building secure REST APIs, CRUD modules, third-party integrations, and Spring Security authentication with solid test coverage. I profile performance using logs, Actuator, Hibernate statistics, query execution plans, indexing, pagination, caching, and JPA query optimization to eliminate slow endpoints and database bottlenecks. I can begin immediately, provide critical bug hotfixes within 24–48 hours depending on complexity, and deliver clean code, meaningful Git commits, regular updates, and reliable evening/weekend collaboration.

@pashyaa

Hi, I have 12+ years of experience with Java, Spring Boot, REST APIs, Spring Data JPA, Hibernate, MySQL/PostgreSQL, authentication, integrations and production troubleshooting. For bug fixes, I first reproduce the issue, review logs and affected flows, identify the root cause, add a regression test and implement the smallest safe fix. For slow queries, I analyse generated SQL and execution plans, review indexes, joins, fetch strategies and transaction boundaries before optimising. I can also implement clean CRUD APIs, third-party REST integrations and secure authentication with proper validation and test coverage. I am available to start immediately, and small hotfixes can typically be completed within one day after reviewing the code and reproducing the issue. Please get in touch to share the current bug list and repository details. Thanks & Regards, Prasanna

@toriquldev123

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@mahads31

Hey, Fixing bugs is only part of the job—the real goal is identifying the root cause, improving performance, and making sure the same issues don't return. I can help stabilize your Java 17/Spring Boot application, optimize slow queries and backend performance, and implement new features without disrupting the existing architecture. I'm comfortable working with Spring Boot, Spring Data JPA, Hibernate, MySQL/MariaDB, REST APIs, Git, and third-party integrations. My approach focuses on clean, maintainable code, meaningful commits, proper testing, and clear communication throughout development to ensure reliable long-term results. I'd be happy to review your existing codebase, discuss the current issues, and outline the most efficient plan to get everything back on track. Best Regards, Mahad

@emilesd617

Hi, I am a Java backend developer with 8 years of rich experience in software development. I am familiar with Java 17, Spring Boot, Spring Data JPA, Hibernate, MySQL, MariaDB, REST API, Git, Microservices, and Performance Optimization. I understand that your Spring Boot application needs immediate bug fixing, performance improvements, and new backend features. I can identify and resolve the existing issues, profile and optimize slow database queries and application bottlenecks, implement clean CRUD APIs, integrate third-party REST services, and develop secure authentication and authorization while keeping the codebase clean, maintainable, and well documented. I'm an individual freelancer and can work on any time zone you want. Please contact me with the best time for you to have a quick chat. Looking forward to discussing more details. Thanks. Emile.

@abhayk49

Hi, I’m a Java Backend Developer with 6+ years of experience in Spring Boot, REST APIs, and performance optimization, and I can help stabilize your application and deliver the new features efficiently. Why I'm a good fit: ✅ Java 17, Spring Boot, Spring Data JPA & Hibernate ✅ MySQL/MariaDB, REST APIs & Third-party API integrations ✅ Spring Security, JWT & Role-Based Authentication ✅ Git, Maven & Production Issue Resolution I’ve worked on ERP, CRM, marketplace, and enterprise Spring Boot applications, resolving production issues, optimizing slow queries, integrating third-party APIs, and implementing secure REST services. For performance optimization, I typically analyze SQL execution plans, optimize JPA queries and indexing, reduce unnecessary database calls, and profile application bottlenecks to improve response times. Turnaround: Critical bug fixes are typically delivered within 24–48 hours, followed by incremental feature delivery through well-structured commits. I’m comfortable collaborating during evenings/weekends and provide regular progress updates with quick response times. Looking forward to discussing your project. Best regards, Abhay Kumar

@borse1012

I'd be happy to help to fix and stabilize your Spring Boot application. I have 14 years of experience building and maintaining enterprise applications using Java 17/21, Spring Boot, Spring Data JPA, Hibernate, MySQL/PostgreSQL, REST APIs, and Git. A significant part of my work involves troubleshooting production issues, optimizing backend performance, and delivering new features without introducing regressions. Relevant Experience I've worked on enterprise Spring Boot applications involving payment systems, ERP/CRM platforms, user management, REST integrations, reporting modules, and cloud-native microservices. These projects included resolving production bugs, optimizing slow database operations, refactoring legacy modules, and implementing secure REST APIs. For most critical production issues, I aim to provide an initial diagnosis within a few hours and deliver hotfixes as quickly as the complexity allows. I'd be happy to review your repository and discuss the highest-priority issues so we can restore stability and move on to the new feature work.

@thiagofoz87

Your backend already points to the right stack, so the key challenge here is stabilizing the current behavior before introducing new features without increasing technical debt. My first step would be to reproduce and isolate the existing failures locally, map the affected flows, and identify whether the root causes are related to transaction handling, JPA/Hibernate mappings, concurrency, inefficient queries, serialization issues, or integration bottlenecks. For performance work, I typically profile slow endpoints and database access patterns using query analysis, execution plans, connection pool metrics, and request tracing. In Spring Boot systems, I often see response degradation coming from N+1 queries, missing indexes, excessive entity loading, blocking external calls, or poorly scoped transactions. Once identified, I refactor incrementally with measurable improvements and regression validation. After stability is restored, I can implement the new CRUD modules, REST integrations, and authentication/authorization flows following a clean layered architecture with consistent validation, exception handling, and test coverage. I work comfortably with Java 17, Spring Boot, Spring Data JPA, Hibernate, MySQL/MariaDB, Git workflows, and API integrations. For hotfixes, I usually provide initial diagnosis quickly and prioritize restoring functionality first, followed by safe refactoring and optimization. I also maintain organized commits and concise communication throughout the delivery process.

@sanjaykumargupta

Hi, I am available to start the work by fixing the bugs and improvement in performance of response time to make the springboot application stable. To improve the performance issue, my approach will be split in two steps: Database level - table relation and column index. Springboot level - join query optimization, caching if applicable etc identified through Spring Boot Actuator. Regards Sanjay

@shayankhan333

Bugs that survive multiple fixes usually point to missing transaction boundaries or lazy-loading surprises in Hibernate, not just logic errors. I'll start by reproducing each issue locally, profiling slow queries with Spring Boot Actuator and Hibernate's SQL logging, then patch with meaningful commits so you can review every change. After stabilizing, I'll add the CRUD endpoints, wire up the third-party API calls using WebClient with proper retry and timeout config, and set up Spring Security with JWT for auth. One thing worth checking early: if your MariaDB queries slow under load, it's often missing indexes on JPA-generated columns rather than the query logic itself. 1) Are the current bugs tied to specific endpoints, or more intermittent failures under load? Happy to talk details in chat. Shayan

@melopgabriel

Hi, your backend needs two things right away: stabilizing the broken Spring Boot behavior, then adding new REST features without slowing the system down. I’ve worked on Java 17 and Spring Boot services with Spring Data JPA, Hibernate, and MySQL/MariaDB where the first step was isolating bugs, tightening tests, and cleaning up the code path before adding features. I’m comfortable with REST integrations, authentication flows, and working directly in a private Git repo with clear commits. My approach is to fix the highest-impact issues first, profile slow endpoints and queries, then implement the new CRUD, API integration, and security work in small milestones so each change stays easy to review and verify. If that sounds like a fit, I’d be glad to help move this forward. Best regards, Gabriel

@lazarr4

Hello. I can debug the Spring Boot stack, fix the performance bottlenecks, and deliver the new endpoints while keeping the code clean and tests passing. I once refactored a Spring Boot microservice that had 400 ms average response time and brought it down to 80 ms by rewriting N+1 queries into a single optimized join and adding Hibernate second-level caching. I’d approach this by profiling with VisualVM and MySQL EXPLAIN, focus on slow API calls first, then add the CRUD endpoints on top of existing JPA repositories. The biggest improvement will come from caching third-party responses and throttling heavy endpoints with a rate limiter. Admins will have a stable back-end that responds quickly even under load. I provide two weeks of bug fixes and performance tweaks after delivery. Let me know if you want to see the profiling results or move forward. Thanks, Lazar.

@mikes126

I’ll start by reproducing the current bugs, tracing logs/exceptions, reviewing problematic service/repository layers, and fixing root causes instead of applying temporary patches. After stability is restored, I’ll profile slow endpoints and optimize areas like Hibernate queries, N+1 issues, indexing, transactions, and API response flow. For the new features, I can deliver: REST CRUD endpoints following your existing architecture Third-party JSON/REST API integrations with proper error handling Secure authentication & authorization (Spring Security, roles/permissions, JWT if required) Unit/integration tests and clean Git commits for every milestone My workflow: Review codebase + identify critical bugs and performance bottlenecks Fix and verify issues with tests Optimize database/API performance Implement new features incrementally with clear commits A few questions: Are the current bugs mainly in REST controllers, business logic, or database/Hibernate layers? Do you already have profiling data or slow API examples? Is authentication already partially implemented or starting from scratch?

@gopinovait

Hi, I understand you need help fixing Spring Boot bugs, improving backend performance, and adding new REST features without disrupting existing functionality. Our team has 10+ years of experience with Java, Spring Boot, JPA/Hibernate, REST APIs, MySQL, and backend optimization. We have delivered production fixes, query performance improvements, third-party API integrations, and secure authentication solutions. We follow a structured approach: analyze, fix, optimize, test, and deliver clean maintainable code with clear communication. Let’s connect and discuss your project requirements.

@dushyant317

I can quickly stabilize your Java 17/Spring Boot application by identifying and fixing the existing bugs, optimizing performance, and then implementing the required CRUD APIs, third-party REST integrations, and secure authentication/authorization using Spring Security. With strong experience in Spring Boot, Spring Data JPA, Hibernate, MySQL/MariaDB, REST APIs, Git, and performance tuning, I'll deliver clean, well-documented code, meaningful commits, comprehensive testing, and regular progress updates to ensure a reliable, production-ready backend.