Top 50+ Java companies

At Aeturnum, a Boston-based software development company, we believe every groundbreaking product begins with a spark of vision—and the right technology to ignite it. For over two decades, we’ve empowered startups, ISVs, and enterprises across the U.S. to turn bold ideas into intelligent digital solutions through AI-driven engineering, cloud innovation, and data-powered insights. We’re more than a software partner—we’re your strategic innovation ally. Our expert teams think like product creators, working closely with clients to design, prototype, and scale next-generation digital products that accelerate business growth. From AI automation and cloud-native app development to data analytics and machine learning integration, we help businesses deliver smarter, faster, and more impactful results. With over 200 successful digital products launched, we combine startup agility with enterprise-grade engineering excellence. Our AI-assisted development practices enable faster delivery, higher code quality, and measurable performance gains—helping businesses stay ahead in a rapidly evolving digital world. As an ISO 27001-certified technology partner, Aeturnum operates as an extension of your team—driving innovation, improving go-to-market speed, and creating lasting competitive advantage. Whether you’re a Boston startup or a nationwide enterprise, Aeturnum helps you transform ideas into digital success stories—powered by intelligence, automation, and innovation.

Full-Stack Software Engineer | I Build Scalable Solutions for Startups & Enterprises You don’t just need code; you need a solution that drives business growth. I specialize in building software that is secure, scalable, and easy to maintain. Whether you are a startup looking to launch your MVP or an established business needing to optimize your legacy code, I bring technical expertise and a business-first mindset to every project. What I bring to the table: Clean, Efficient Code: I write code that is easy to read and cheap to maintain. Problem Solving: I don’t just take orders; I suggest improvements to make your product better. Reliability: 100% job completion rate. If I say I’ll do it, consider it done. My Tech Stack: Front-end: [e.g., React.js, Vue, Angular, Tailwind CSS] Back-end: [e.g., Node.js, Python/Django, Java Spring] Database: [e.g., PostgreSQL, MongoDB] Tools: [e.g., AWS, Docker, Git] Let’s turn your complex idea into a user-friendly reality. Click "Invite to Job" and let's chat about your project.

We are a high-performance two-person development team focused on building reliable, scalable web platforms and automation systems. We work closely with our clients, handling projects end-to-end — from architecture and development to deployment and support. Our experience includes building automated trading platforms, custom CRM and inventory systems, and optimised business applications. We specialize in full-stack development using modern technologies such as TypeScript, React, Next.js, Node.js, Java, and C#.

BYTEC Apps Flow is a unified agency that turns your ideas into flawless digital reality. We combine creativity, technology, and precision by assembling dedicated teams from our curated network of developers and designers. Whether you need a mobile app, a complex web solution, or future-tech integration, we provide the right experts—specialized in Flutter, Node.js, Java, .NET, DevOps, and UI/UX—who work together seamlessly under one roof. What We Do: Mobile Apps: Native & cross-platform (Flutter) development for Android & iOS. Web Solutions: Full-stack web applications (Node.js, Java, .NET, JavaScript). Future-Tech: Integration of AI, blockchain, and automation. Team as a Service: Dedicated development squads tailored to your project. Why BYTEC Apps Flow: Expert Team: Skilled developers and designers turning concepts into reality. Single-Point Management: One project lead coordinates the entire team for clear communication. Tailored Approach: Solutions designed for your unique business needs. Reliable Partnership: We deliver consistent quality you can trust. BYTEC Apps Flow — Your ideas, flowing into digital reality.

At Mach41, we don't just build software; we engineer high-performance engines for Enterprise Business. We are a boutique consultancy founded Enterprise Architects and Oxford-certified Data & AI Architects. We specialize in solving the "heavy lifting" problems that generalist agencies cannot touch: Legacy Modernization, High-Frequency Trading Systems, and Secure Enterprise AI. Our partners have served as CTOs and Lead Architects for Tier1 organizations across Banking, Insurance, Retail. Telecoms, Automotive, Utilities and Public sector . We bring C-level strategic vision combined with deep, hands-on engineering precision. CORE CAPABILITIES: Legacy to Cloud-Native Modernization We rescue stagnant legacy platforms. We specialize in decomposing complex Java monoliths into scalable Service Mesh/Data Mesh architectures. Enterprise AI & RAG Strategy We move beyond "AI hype" to deploy secure, governable AI. We design RAG (Retrieval-Augmented Generation) frameworks using Azure OpenAI and Vector Databases that allow enterprises to query their private data safely. High-Performance & Low-Latency Systems Born in Capital Markets, we understand the need for speed. We design distributed In-Memory Data Grids (Hazelcast, Redis) and low-latency messaging backbones (Kafka, FIX Protocol) that handle billions of records with millisecond latency. THE MACH41 DIFFERENCE: Architect-Led: You work directly with Senior Principals, not junior developers. Speed & Scale: Whether it is optimizing a trading algorithm or scaling a SaaS platform, we engineer for velocity.

At ITerelia, we are a technology consulting and software development firm dedicated to providing premium IT solutions to businesses of all sizes. Based out of Rome, Italy, our team consists of individuals with expertise in both IT delivery and a keen understanding of the way businesses are run, to fulfill all your IT requirements from scratch to delivery.

Senior Software Architect • System & Cloud Architecture Digital Product Creator • Concept → Launch Digital Transformation Manager • Team & Program Lead Actively looking for a new challenge!

I’m a developer experienced in building websites for small and medium-sized businesses. Whether you’re trying to win work, list your services, or create a new online store, I can help.

Welcome to Experts Academy, your trusted destination for quality education, skill development, and professional training! We specialize in personalized tutoring, short courses, project guidance, crash preparation, and staff training for students and educators alike. At Experts Academy, we believe learning should be interactive, practical, and enjoyable, combining theory with hands-on exercises, coding sessions, and real-world problem-solving. Our Services 1️⃣ Young Learners (Ages 7–16): • Foundational Science (Physics, Chemistry, Biology) • Mathematics and Problem-Solving • English Language & Literature • Basic Computer Skills and Applications 2️⃣ O-Level & A-Level Tutoring: • O-Level: Physics, Chemistry, Biology, Mathematics, Additional Mathematics, Computer Science / ICT, Computer Applications, English Language, English Literature (optional) • A-Level: Physics, Chemistry, Biology, Mathematics / Further Mathematics, Computer Science, English Language, English Literature / Literature in English 3️⃣ Matric & FSc (Pre-Engineering, Pre-Medical, ICS): • Physics, Chemistry, Biology • Mathematics, Statistics, Computer • English Language and Communication Skills 4️⃣ Specialized Academic Support: • BS/College-level Final Year Projects (FYP) and Thesis Guidance • Research Support and Project-Based Learning • Crash preparation for exams in any subject • Skill-oriented Computer Short Courses (Python, Web Development, AI/ML, Databse) • Training for educational staff and teachers Why Choose Experts Academy? • Experienced Educators: Our team includes highly qualified teachers with years of experience in Science, Mathematics, and Computing. • Interactive & Practical Learning: Hands-on exercises, coding sessions, and assignments strengthen understanding. • Flexible Learning: Online and offline classes to suit any schedule. • Result-Oriented Approach: Focus on grades, skills, and long-term understanding. • Personalized Attention: Tailored learning plans based on each student or staff member’s needs. Whether you are a young learner, an O/A-Level student aiming for top grades, a college student preparing for FYP, or an educational professional seeking skill enhancement, Science Academy is here to guide you every step of the way.

Principal Mobile & Full-Stack Developer | Android · Flutter · Unity · Node.js I’m a senior software engineer with 8+ years of hands-on experience building production-ready mobile and backend systems. My core strength is taking products from idea to launch, with a strong focus on architecture, performance, and long-term maintainability. I specialize in native Android development, cross-platform mobile apps, and scalable backend services. I don’t just write code — I think like a product owner, anticipate edge cases, and build systems that scale. What I can help you with Native Android apps (Kotlin, Java) Cross-platform apps with Flutter Backend services with Node.js & TypeScript Clean Architecture, MVVM / MVI REST APIs & real-time systems Firebase integration (Auth, Firestore, Functions, Crashlytics, IAP) In-app purchases & subscription systems Performance optimization & refactoring Publishing & maintaining production apps Technical Stack Mobile: Android (Kotlin, Java), Flutter Game Development: Unity (C#) Backend: Node.js, TypeScript Architecture: Clean Architecture, SOLID, MVVM / MVI Services: Firebase, REST APIs, real-time communication Tools: Android Studio, Git/GitHub, CI/CD pipelines Experience Highlights Startup-level and enterprise-grade applications POS systems with hardware integrations Real-time platforms and scalable backend architectures Mobile games and interactive applications Long-term product ownership and maintenance I value clear communication, clean code, and delivering on time. If you’re looking for a developer who can design, build, and own your product end-to-end, let’s talk.

We help enterprise and mid-market companies implement complex software solutions with predictability and minimal risk. Specializing in payment solutions, billing, ERP’s. • Senior-only team • 6 years together • Development, Business Analysis, Testing, Devops Typical engagements: audit + stabilization, MVP → production, long-term What we build: ✔ Multi-Banking Platforms ✔ Telecom Billing Systems ✔ Warehouse & Order Management ✔ Enterprise Payment Gateways ✔ Public Sector ERPs Tech Stack: Backend: JDK, JDBC, Hibernate, JPA, Java Spring Framework , Spring Security, Quarkus, RESTful Web Services, GraphQL, Microservices, XML XSLT transformations, Cloud/Infra: Azure, AWS Databases: PostgreSQL, Oracle, MongoDB, Redis Message Brokers: Rabbit MQ, IBM MQ ELK: Elsaticsearch, Logstash Security: OAuth2, OIDC, JWT, Spring Security, Keycloak , Active Directory (AD) Frontend: JavaScript/TypeScript, React.js, Next.js, Angular, Svelte, Astro UI / Styling: Material-UI (MUI), Tailwind CSS, shadcn/ui, Mantine, Bulma, Bootstrap, SASS / SCSS, LESS, Stylus What we deliver — outcomes, not hours: ✔ Scalable, secure, maintainable systems ✔ Full ownership from discovery to deployment ✔ Predictable delivery and transparent reporting ✔ Fast onboarding — we integrate into your team

Software Engineer with 2+ years of professional experience delivering production-ready software for international projects. Strong foundation in Java and Spring ecosystem with solid understanding of software development processes, multi-tier architectures, and service-oriented applications. Experienced in designing clean, maintainable backend systems, working with relational databases and ORM technologies, and collaborating effectively in agile, cross-functional teams. Known for taking ownership of features, communicating clearly, and continuously improving system quality and reliability. I have my own team, so in case you need faster shipping, we can communicate about this.

At Digital Opera Ocean, we provide end-to-end digital solutions designed to help businesses dominate the modern marketplace. Based on our philosophy of "Digital Excellence," we bridge the gap between technical development and high-impact marketing. We don’t just build your platform; we ensure people find it, use it, and keep coming back. What We Do: 1. Development (Web & Mobile) Business Websites: High-speed, SEO-friendly websites tailored to your industry (WordPress, Laravel, Custom React). App Development: Specializing in Web-to-Mobile Conversion, transforming your site into a professional Android/iOS app with Push Notifications and Play Store approval. 2. Growth & Advertising (Ads & Marketing) Facebook & Google Ads: Data-driven campaigns focused on high ROI and low Cost-Per-Acquisition (CPA). Social Media Management: Consistent, high-quality content and community management to build brand authority. Digital Marketing Strategy: Full-funnel strategies to turn visitors into loyal customers. Why Digital Opera Ocean? Holistic Strategy: We understand how code and marketing work together. We optimize your website for conversions before we spend a cent on ads. Proven Track Record: Developers of platforms like Elite Auto BD and Halal Bazar BD, we know what it takes to succeed in competitive markets. Transparency: Clear reporting on ad spend, app performance, and project milestones. The Ocean of Opportunities Awaits. Let’s build your digital empire together. Click the 'Invite to Job' button to start a conversation about your project!

I am a Full Stack Developer specializing in building high-quality web and mobile applications for businesses of all sizes. I help transform ideas into secure, scalable, and user-focused digital solutions. My expertise includes Java, React, Angular, and modern backend technologies, along with cross-platform mobile development using React Native and Flutter. I manage projects end-to-end—from architecture and development to deployment and optimization—ensuring clean code, performance, and reliability. I value clear communication, strong collaboration, and delivering solutions that create real business impact.

Crawfield & Dutton is a full-stack product development and AI innovation company, born in the heart of India’s fintech ecosystem. We build high-performance SaaS platforms, intelligent automation systems, and enterprise-grade applications for BFSI and beyond. We specialize in helping startups, fintechs, banks, and enterprise clients move from 0 → 1 with speed, scalability, and smart systems. --- 🚀 Our Core Expertise Artificial Intelligence & Agentic Systems Predictive models, conversational AI, retrieval-augmented generation, signal-driven systems Business Rule Engines & Workflow Automation Low-code/high-performance rulesets, compliance automation, underwriting engines, credit/risk logic Full-Stack SaaS Development MERN stack, FastAPI, Django, PostgreSQL, Redis, WebSocket infra, API-first SaaS layers Banking APIs & Fintech Infrastructure Account Aggregator, eKYC, GST analytics, Bureau APIs, UPI integration, PCI-grade security Mobile App Development Modern Android apps (Kotlin/Flutter), micro-app SDKs, custom UIs for lending, wallets & more --- Why Work With Us? * 🛠️ Built 20+ micro-products across lending, KYC, recovery, and automation * 🤝 Strategic thinkers who align tech with business outcomes * ⚡ Rapid execution with clean code and scalable infra * 🧪 Open to experimentation, R&D, and new-age workflows (LLMs, agent-based logic, etc.) --- Whether you're a product founder, innovation team, or just a someone exploring tech for your solution — we bring deep domain + engineering execution to the table. Let’s build something powerful.

Hi, I build AI systems that actually work in the real world. Not just demos, not just buzzwords. I am an AI Engineer and Full Stack Developer with hands on experience building production grade AI products used by real users. I currently work as an Artificial Intelligence Engineer and also run my own AI solutions company, where I help startups and businesses turn ideas into reliable AI powered products. If you are tired of prototypes that never scale, models that hallucinate, or AI features that look cool but do nothing for the business, we will get along well. What I do best • AI powered web and backend systems using Python, FastAPI, and Flask • LLM based applications including RAG, agents, multimodal AI, and automation • Production ready integrations with OpenAI, open source models, and cloud services • End to end MVPs from idea to deployment • Performance focused systems that care about latency, cost, and reliability I have built systems like • Vision and language AI pipelines processing over a million documents with sub second retrieval • Multimodal assistants with voice, vision, and reasoning • Agent based workflows for planning, monitoring, and decision support • AI products used in security, automation, and data intelligence I hold a Master’s degree in Computer Science with a Machine Learning focus and have professional experience working with modern AI stacks including LangChain, LangGraph, FAISS, Hugging Face, and cloud based AI platforms Resume How I work • Clear and frequent communication • Honest timelines and realistic expectations • Clean, well documented code • No disappearing mid project • No overengineering unless it actually helps A bit of honesty If you want magic with one prompt, I am probably not your guy. If you want a reliable AI system that works today and still works six months from now, let’s talk. Send me a message, tell me what you are building, and I will tell you exactly how I would approach it.

I am the Founder and Technology Lead at SiyanTech Global Innovations Pvt. Ltd., a technology services company specialising in AI automation, cloud engineering, DevOps, and custom software development. We help startups, SMEs, and enterprises improve efficiency, reduce operational costs, and build scalable, secure digital solutions. Our approach is business-focused — we don’t just write code, we solve real problems using the right technology. Core areas of expertise: • AI automation & AI-powered applications • Cloud architecture and infrastructure (AWS, Azure, GCP) • DevOps, CI/CD pipelines, and system optimisation • Custom web and software application development • API integrations and backend systems As a founder-led team, I personally oversee solution architecture, technical quality, and delivery. Clients value clear communication, realistic timelines, and long-term support. If you are looking for a reliable technology partner who understands both business and engineering, let’s connect.

The XWL is an elite engineering collective built to solve problems that standard freelancers cannot handle. Led by a former CTO and Senior Engineering Manager, we bridge the gap between technical execution and business strategy. We do not just write code; we architecture scalable systems, modernize legacy infrastructure, and design intuitive products for enterprise clients. Our team brings a pedigree of world-class engineering—including talent from Meta (London)—ensuring your software is built to global standards of performance, security, and maintainability. WHY LEADING COMPANIES TRUST THE XWL - Managed Delivery, Not Just Freelancing: You are not hiring a lone developer; you are hiring a managed squad. Our projects are overseen by a Senior Engineering Manager who has directed departments of 25+ engineers, ensuring professional governance, clear communication, and architectural integrity. - Complex Problem Solvers: We thrive where others fail. Whether it is optimizing dashboards to render 100,000 data points per second or reducing backend load times by 90% via advanced caching, we deliver measurable performance. - Full-Cycle Product Studio: We handle the entire lifecycle. From Brand Identity and UI/UX Design by a Principal Designer with 15+ years of experience to cloud-native deployment on AWS. OUR CORE PRACTICE AREAS 1. Enterprise Modernization & Architecture We specialize in rescuing "unmaintainable" code. We migrate legacy monolithic systems (Servlets/Legacy Java) to modern Spring Boot 3 microservices. We decouple complex engines to ensure your platform can scale without breaking. 2. High-Performance SaaS Development We build robust full-stack applications using Java, Node.js (NestJS), and React/Angular. Our team is expert in building real-time analytics platforms, AI-powered agent workflows, and industrial IoT dashboards that monitor operations across 30+ plants. 3. Cloud Infrastructure & Enterprise Security We make your software "Enterprise-Ready." We implement AWS cloud-native architectures using Docker, Kubernetes, and Helm. We secure your applications for big clients by integrating SCIM 2.0, OAuth 2.0, and SSO (Okta/Microsoft Entra ID). 4. Strategic Product Design Our design division offers "Business in a Box." We provide high-fidelity UI/UX design, motion graphics, and complete corporate branding, ensuring your product looks as good as it performs. OUR TECH STACK - Backend: Java (Spring Boot), Node.js (NestJS), Python - Frontend: React, Angular, TypeScript, High-Performance Data Viz - Cloud & DevOps: AWS, Docker, Kubernetes, Helm, CI/CD, Grafana - Process Automation: Camunda BPM, AI Agent Integration - Design: Adobe Creative Suite (Ps, Ai, Ae), UI/UX Ready to upgrade your engineering capabilities? Contact The XWL today to discuss your architecture, modernization, or product launch.

Strandix System – India | Your Trusted Tech Partner for Digital Growth Welcome to Strandix System – India, where innovation meets excellence! We are a full-service technology agency specializing in transforming business ideas into scalable digital products. With a strong foundation in software development, mobile apps, web platforms, and cloud-enabled solutions, we help startups and enterprises build, grow, and succeed in the digital age. 🌟 What We Do At Strandix System – India, we deliver results-driven services that span the entire digital lifecycle: - Mobile & Web Development - Custom mobile apps (iOS & Android) - Responsive web applications - Scalable backend systems - Cross-platform solutions (Flutter / React Native) - B2C & B2B Platforms - Marketplace development (e-commerce, services) - Community & social networking app - SaaS platforms & subscription-based systems - UI/UX Design - User-centered design - Interactive prototypes - Visual branding & graphics - Quality Assurance & Support - Manual & automated testing - Continuous integration - Maintenance & upgrades - Digital Strategy & Consulting - Product strategy & roadmaps - Technology selection - Growth & optimization planning 🚀 Why Choose Us ✅ Experienced Team – Skilled developers, designers, and strategists committed to excellence. ✅ Client-First Approach – We listen, understand your vision, and deliver what matters most. ✅ Quality & Reliability – End-to-end support from idea to launch…and beyond. ✅ Timely Delivery – Agile development ensures milestones are met with transparency. ✅ Value-Driven Solutions – High ROI and solutions built for performance and scalability. 💼 Industries We Serve We have successfully delivered projects in: * Startups & SMBs * Education & e-learning * Healthcare & Wellness * On-demand services * Fintech & marketplaces * Social & community platforms 🎯 Our Commitment We don’t just build software — we build partnerships. Whether you’re launching your first MVP, scaling a profitable product, or optimizing your tech stack for growth, Strandix System – India delivers solutions that align with your business goals. Let’s turn your idea into a success story. ✉️ Let’s Get Started! Connect with us to discuss your project — we’re ready to deliver excellence on Upwork!

Cogentix System is a professional IT recruitment and staffing company focused on delivering high-quality talent solutions to businesses across industries. We partner with organizations to help them build strong teams by providing skilled professionals who match both the technical requirements and the culture of the workplace. With a deep understanding of the IT hiring landscape, we specialize in sourcing and delivering talent across a wide range of technologies and roles, including Progress, QAD, Java, .NET, Azure, GCP, AWS, SaaS, SAP, Python, Business Analysts, Data Analysts, and many more. Along with recruitment, we also support development-related hiring needs based on evolving client demands and project requirements. At Cogentix System, we provide flexible staffing support through multiple hiring models such as W2, C2C, C2H, Fixed/Direct Hiring, and Permanent Hiring, ensuring our clients receive the right solution for every hiring need. What sets us apart is our structured recruitment approach, driven by strong coordination between our Account Managers and HR team. Our Account Managers carefully understand client requirements and ensure clarity before passing them to our HR team. The HR team then screens, shortlists, and conducts telephonic interviews to evaluate candidate suitability before presenting profiles to clients. We operate using our in-house candidate database, allowing us to identify and engage with qualified professionals efficiently. This approach helps us deliver faster turnaround times, improved candidate matching, and consistent recruitment quality. At Cogentix System, we don’t just fill roles—we build workforce solutions that support long-term business growth. Our commitment is to deliver excellence, maintain transparency, and create value for both clients and candidates through every stage of the hiring journey.