SERVICES
Spring Boot Development Services for production Java backends
We build and modernize Spring Boot systems: REST APIs, Spring Security and auth flows, Hibernate and JPA performance work, microservices where the boundary is real, and Spring Boot 3 and 4 upgrades. Founder-led, in Java every day.
Discuss your projectSpring Boot systems rarely break at the controller layer. They break at dependency drift no one has audited, at a Spring Security config that was correct three major versions ago, at Hibernate queries that were fine until the table grew, and at an upgrade nobody has budgeted because nobody knows what it costs. Those are the problems we get called about.
Java and Spring Boot is what we work in most weeks of the year. Every engagement is led by founder Gopal Sabhadiya (a Toptal engineer, Expert-Vetted on Upwork, an Infosys Power Programmer) with a team of 10. We built the Spring Boot and Spring Security authentication microservice that runs in production at national scale for USP.org, and we have taken Spring Boot services across the Jakarta namespace change on systems that were serving live traffic throughout.
The Taapti Technologies team is highly competent and professional in Spring Boot development. They successfully transitioned our back-end from monolithic architecture to microservices and extended modules effectively.
Spring Boot APIs that survive production traffic
Versioned REST contracts, a consistent error model, real transactional boundaries, validation at every input edge, and health and metrics endpoints you can act on before users complain.
Spring Security and auth flows
SecurityFilterChain configuration, JWT and OAuth 2.1 or OIDC boundaries, role and permission modeling, and the filter-level detail that decides whether an internal dispatch quietly starts returning 403.
Spring Boot 3 and 4 upgrade planning
Java baseline, the Jakarta namespace change, Hibernate 6, Spring Security 6, and dependencies with no upgrade path. You get the sequence and the risk before the branch, not after.
Microservices when the boundary is real
We split a system when the team structure, release cadence or scaling need genuinely calls for it, and keep a well-built modular monolith when that is the honest answer.
Hibernate, JPA and PostgreSQL performance work
N+1 queries, fetch strategy, identifier generation, missing indexes, connection pool sizing and caching. We profile first and change the thing the profile points at.
Founder-led Java backend delivery
Based in Surat, India, serving clients worldwide in English, billed in USD, with 4+ hours of overlap with any timezone.
When should you hire a Spring Boot development team?
The usual triggers are specific. API latency has crept up and nobody can say which query is responsible. Authentication works but no one is confident enough to change it. You are on Java 8 or 11 and a security review has started asking questions. Your Spring Boot 2.x application is outside open-source support and the upgrade keeps getting deferred because the size of it is unknown. A monolith has grown to the point where two teams cannot ship in the same week without coordinating.
Each of those is a different job. Latency is a data-access problem more often than a code problem. Auth confidence is a test-coverage problem as much as a configuration one. An upgrade that keeps slipping is usually an estimation problem, which is why we built a tool for it rather than quoting a number we could not defend.
How we build Spring Boot APIs and microservices
We start at the data. Most performance problems in a Spring Boot application are schema and access-pattern problems wearing a Java costume, so the entity model and the queries come before the endpoints. From there we build stateless services that scale horizontally, with versioned REST contracts, a single consistent error shape, request validation at the boundary, and transactional boundaries drawn where the business invariant actually sits rather than wherever @Transactional was easiest to type.
Microservices are an architecture, not an upgrade. They buy independent deployment and scaling at the cost of network calls, distributed failure and operational overhead. We recommend them when your release cadence or team topology needs them, and we say so plainly when a modular monolith would serve you better. Christian Fuchs's team at Kigaportal is a case where the split was the right call, and we moved their back end from a monolith to microservices. For our backend development service more broadly we work in Node.js as well, and we will tell you when that is the better fit.
Spring Security, authentication and authorization
Spring Security is where the most expensive mistakes hide, because a misconfiguration usually fails open or fails silently rather than throwing. We build auth as a first-class part of the system: SecurityFilterChain beans rather than the deprecated adapter style, explicit authorization rules per route, role and permission modeling that survives contact with real org structures, and JWT or OAuth 2.1 and OIDC boundaries chosen for your actual trust model.
We also treat auth as the thing that must be tested before anything else changes. Before an upgrade we want integration coverage on login, on one write path and on one paginated read, because those three catch most of what a compiler will not. The USP.org work is the reference here: a horizontally scalable Spring Boot and Spring Security authentication microservice running in production at national scale.
Spring Boot 2 to 3 and 4 upgrade work
This is now urgent for most teams still on 2.x or early 3.x. Every 2.x and 3.x branch is outside open-source support: 3.5 was the last to go, on 30 June 2026, and only 4.0 and 4.1 receive open-source patches, with 4.0 itself reaching open-source end of life on 31 December 2026. Spring Boot 4 requires Java 17 as a minimum, not Java 21, whatever several widely-shared blog posts claim.
The work splits into parts that behave very differently. The JDK move usually costs more than the framework move and should ship on its own so a rollback means something. The Jakarta namespace change is mechanical for most of the source tree and not mechanical at all for the string-typed half: fully-qualified javax names in persistence.xml, web.xml, XML namespace URIs, taglib URIs and META-INF/services fail at boot rather than at compile. Counting javax imports overstates the job, because javax.sql, javax.crypto, javax.naming and javax.xml.parsers never moved. Hibernate 6 changes the type system and identifier allocation in ways that collide with existing rows. Dependencies with no Jakarta path, Springfox being the common one, are replacements rather than version bumps.
If you want the size of it before committing a quarter, run our Spring Boot 3 Migration Risk Analyzer. It reads a pom.xml or Gradle build file in your browser, nothing is uploaded, and it returns a scored risk breakdown and a sprint-sized sequence. Where the work is broader than the framework, our legacy modernization service covers the incremental route that avoids a big-bang rewrite.
Performance tuning for real backend bottlenecks
We profile before we change anything, because the slow thing is rarely the thing people suspect. The recurring offenders are N+1 query patterns from lazy associations, a fetch strategy that pulls a graph when it needed a projection, missing or unusable indexes, identifier generation that serializes inserts, connection pools sized by copy and paste, and caching applied where it hides a data-model problem instead of solving one.
The deliverable is a measurement, a change and a second measurement. We use load tests to establish what the system does under the traffic you actually get, then fix in the order the profile dictates. Where the bottleneck turns out to be architectural rather than query-level, we say that before spending your budget on tuning that cannot reach it.
Spring Boot build work or a Spring Boot upgrade: where should you start?
These are different engagements with different first deliverables. Most teams need one of them clearly more than the other.
| Build or improve | Upgrade to 3 or 4 | |
|---|---|---|
| Current state | Supported version, but slow or brittle | Outside open-source support, or stuck on Java 8 or 11 |
| Main risk | Building the wrong thing | Breakage that compiles cleanly, then fails in production |
| First deliverable | A profile and a prioritised change list | A scored risk breakdown and an upgrade sequence |
| Start with | A conversation about the symptoms | The free Migration Risk Analyzer, on your build file |
Proof
USP.org (United States Pharmacopeia)
Horizontally scalable Spring Boot + Spring Security authentication microservice running in production at national scale for USP.org.
Tech we use
Java 17 and 21 
Spring Boot Spring Security Spring Web Spring Data JPA 
Hibernate 
PostgreSQL REST APIs OAuth 2.1 and OIDC JWT Authentication Microservices OpenRewrite 
Docker 
Kubernetes AWS Frequently asked questions
What are Spring Boot development services? +
Spring Boot development services cover building and maintaining the Java server side of your product: REST APIs, Spring Security and authentication, data access through Spring Data JPA and Hibernate, background and scheduled work, and the deployment and observability around it. In practice the work splits into building new services, improving ones that are struggling, and upgrading ones that have fallen behind the supported versions.
When is Spring Boot the right backend framework? +
Spring Boot fits complex, transaction-heavy and integration-heavy systems, where static typing, a mature security stack and a deep ecosystem pay for themselves. It is a strong default when correctness under concurrency matters, when you need real transactional boundaries, or when your organisation already runs on the JVM. For high-concurrency I/O-bound workloads and real-time features, Node.js is often the better fit, and we will say so.
Can you help migrate from Spring Boot 2 to Spring Boot 3? +
Yes, and it is a large share of what we do. A 2.x to 3.x move crosses the Jakarta namespace change, needs a Java 17 baseline, and brings Hibernate 6 and Spring Security 6 with it. We sequence the JDK upgrade separately from the framework upgrade so a rollback stays meaningful, and we want integration coverage on authentication and on one write path in place before the branch is cut.
What breaks during a Spring Boot 3 migration? +
The mechanical javax to jakarta rename is handled well by OpenRewrite. What it cannot reach is the string-typed half: fully-qualified javax names in persistence.xml, web.xml, XML namespace URIs, JSP taglib URIs, META-INF/services files and anything resolved by reflection. Those fail at boot, not at compile. Beyond that, Hibernate 6 changes the type system and identifier allocation, Spring Security 6 requires SecurityFilterChain beans and invalidates remember-me cookies, and some libraries have no Jakarta version at all. Our free analyzer scores these for your specific build file.
Do you build Spring Boot microservices? +
Yes, when the boundary is real. We have moved a monolithic Spring Boot back end to microservices for Kigaportal and extended it from there. We also keep systems as modular monoliths when splitting them would add network failure modes and deployment overhead without buying independent scaling or release cadence. The decision should come from your team topology and traffic, not from the pattern being fashionable.
How do you secure a Spring Boot API? +
With Spring Security configured as SecurityFilterChain beans, explicit authorization rules per route, and a token model chosen for your trust boundary: JWT for stateless service-to-service, OAuth 2.1 or OIDC where a real identity provider is involved. Beyond configuration we validate every input boundary, enforce least-privilege data access, apply rate limiting, and add integration tests over the auth paths so a later change cannot silently open them.
Can you tune a slow Spring Boot application? +
Yes. We profile first, because the cause is usually data access rather than Java. The common findings are N+1 queries from lazy associations, fetch strategies that load a whole graph where a projection would do, missing indexes, identifier generation that serializes inserts, and connection pools sized without reference to the database. We measure, change one thing, and measure again, and we tell you when the real limit is architectural rather than something tuning can reach.
How much does Spring Boot development cost? +
It depends on scope, system age and how much test coverage already exists, so we do not publish a rate card. We are based in Surat, India, serve clients worldwide and bill in USD. If the question is specifically about an upgrade, the free Spring Boot Migration Risk Analyzer gives you a sprint-sized planning band from your own build file before you talk to anyone, including us.