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Wasim S.

Vahdat, Tajikistan

$100/hr
5.0
35 jobs

๐—˜๐˜…-๐—๐˜‚๐˜€๐˜๐—˜๐—ฎ๐˜ | ๐—˜๐˜…-๐—ฆ๐˜๐—ฎ๐—ฝ๐—น๐—ฒ๐˜€ | ๐—˜๐˜…-๐—™๐—ถ๐—ป๐˜‡๐—น๐˜† | ๐—ง๐—ผ๐—ฝ ๐Ÿญ% ๐—จ๐—ฝ๐˜„๐—ผ๐—ฟ๐—ธ ๐—ง๐—ฎ๐—น๐—ฒ๐—ป๐˜ | ๐—•๐˜‚๐—ถ๐—น๐˜ ๐—ฃ๐—น๐—ฎ๐˜๐—ณ๐—ผ๐—ฟ๐—บ๐˜€ ๐—ณ๐—ผ๐—ฟ $๐Ÿฎ๐—•+ ๐—•๐—ฟ๐—ฎ๐—ป๐—ฑ๐˜€ I optimize backend architecture, infrastructure cost, database performance, and cloud security for high-growth SaaS platforms. Previously Senior Engineer at JustEat, Staples, and Finzly. 9+ years building production systems at scale, supporting 100k+ active users. I design systems that directly improve business margins through performance, reliability, and cost efficiency. Impact: -42% Cloud Spend | 94% Faster Data Pipelines | $2B+ processed on systems I helped design and operate. ๐ˆ๐-๐‡๐Ž๐”๐’๐„ ๐’๐€๐€๐’ ๐Œ๐ˆ๐๐ƒ๐’๐„๐“ & ๐“๐Ž๐“๐€๐‹ ๐Ž๐–๐๐„๐‘๐’๐‡๐ˆ๐ I operate like a technical co-founder, not a ticket-based freelancer. I take end-to-end ownership of architecture, scalability, and delivery. You define the business goal, and I design and implement the backend system to achieve it with minimal operational overhead and long-term scalability. From MVP to millions of users, I make architecture decisions based on performance, cost efficiency, and maintainability. ๐๐„๐‘๐…๐Ž๐‘๐Œ๐€๐๐‚๐„ & ๐ƒ๐€๐“๐€ ๐„๐๐†๐ˆ๐๐„๐„๐‘๐ˆ๐๐† If your system is slow or your cloud bill is increasing, I refactor architecture for both performance and cost efficiency. โ—† At Staples, reduced a core data pipeline from 90 minutes to 5 minutes (94% improvement) โ—† Optimized backend systems using caching, indexing, Kafka, and Redis to achieve millisecond-level latency โ—† Refactored legacy systems into scalable event-driven architectures where needed ๐‘๐€๐๐ˆ๐ƒ ๐Œ๐•๐ ๐ƒ๐„๐•๐„๐‹๐Ž๐๐Œ๐„๐๐“ (๐€๐ˆ ๐€๐‚๐‚๐„๐‹๐„๐‘๐€๐“๐„๐ƒ) Need to launch fast? I combine AI-assisted frontend generation with production-grade backend architecture. Using tools like Lovable, Bolt.new, v0, Supabase, and Cursor to accelerate UI development, while I design and implement secure, scalable AWS backends underneath. ๐ˆ๐๐•๐„๐’๐“๐Ž๐‘-๐‘๐„๐€๐ƒ๐˜ ๐€๐‘๐‚๐‡๐ˆ๐“๐„๐‚๐“๐”๐‘๐„ & ๐‚๐Ž๐Œ๐๐‹๐ˆ๐€๐๐‚๐„ Preparing for funding rounds or enterprise clients: โ—† Architecture audits to identify risks, bottlenecks, and cost inefficiencies โ—† Compliance-ready systems aligned with HIPAA, GDPR, SOC2, and PCI-DSS โ—† Clear technical documentation for investor and enterprise due diligence ๐–๐‡๐€๐“ ๐ˆ ๐ƒ๐„๐‹๐ˆ๐•๐„๐‘ โ—† Cost-efficient backend systems optimized for real production workloads โ—† Scalable architectures designed for long-term product growth โ—† High-availability systems built for peak load reliability โ—† AI-integrated backend systems using OpenAI and AWS Bedrock ๐‘๐„๐‚๐„๐๐“ ๐‚๐€๐’๐„ ๐’๐“๐”๐ƒ๐˜ A fintech platform was failing during traffic spikes, causing failed transactions and rising infrastructure costs. I re-architected their backend into a scalable event-driven system, optimized APIs, and removed database bottlenecks. Result: handled a 300% traffic surge with zero downtime and reduced AWS costs by 42% within one month. ๐“๐„๐‚๐‡ ๐’๐“๐€๐‚๐Š ๐€๐“ ๐€ ๐†๐‹๐€๐๐‚๐„ Languages: Java (Spring Boot), Node.js (NestJS), Python Cloud/Infra: AWS (Lambda, ECS/Fargate, DynamoDB, RDS, EventBridge, S3), Terraform, CDK etc... AI: OpenAI, AWS Bedrock, LangChain etc... Data: Redis, Kafka, Supabase etc... Tools: Lovable, Bolt.new, v0, Cursor base44, claude etc.. ๐‚๐‹๐Ž๐”๐ƒ๐…๐‹๐€๐‘๐„ ๐„๐ƒ๐†๐„ & ๐’๐„๐‘๐•๐„๐‘๐‹๐„๐’๐’ Cloudflare Workers (APIs), R2 (storage), D1/KV (data), Queues/Durable Objects (async), CDN/WAF etc... ๐ˆ๐๐ƒ๐”๐’๐“๐‘๐ˆ๐„๐’ Fintech (PCI/GDPR), Healthcare (HIPAA), E-commerce, Logistics, Marketplaces ๐‘๐„๐€๐ƒ๐˜ ๐“๐Ž ๐“๐€๐Š๐„ ๐˜๐Ž๐”๐‘ ๐€๐‘๐‚๐‡๐ˆ๐“๐„๐‚๐“๐”๐‘๐„ ๐’๐„๐‘๐ˆ๐Ž๐”๐’๐‹๐˜? If you're building a serious SaaS product, you donโ€™t just need code, You need architecture that scales, performs, and stays cost-efficient under real production load. Send 2โ€“3 time slots, and Iโ€™ll review your system and suggest an architecture approach.

  • JavaScript
  • Python
  • Node.js
  • Django
  • Web Application
  • AWS Lambda
  • RESTful API
  • Amazon Web Services
  • Java
  • Serverless Computing
  • Cloud Computing
  • Microservice
  • ExpressJS
  • AWS Development
  • Database
Nitesh K.

Bengaluru, India

$18/hr
5.0
4 jobs

โœ… 10+ years experience. โœ… 390 + hours worked โœ… Exceptional English Conversation skills โœ… 100% Quality Backend developer specialised in Java, Python, Gen AI and Spring Boot, with a proven track record of delivering scalable, high-performance solutions for businesses. Over the years, I have worked with leading MNCs like Walmart Labs and Samsung, as well as dynamic startups such as OYO Rooms and 1mg, to build robust backend systems that power seamless user experiences. Front-end developer, with a solid 9+ years of experience and a proven track record, I am dedicated to implementing best practices and leveraging the latest technologies to deliver exceptional results. Backend developer with 10+ years of professional experience along with 2+ years as a full stack developer, specialising in: โœ” Java, Spring Boot, Spring Data JPA, Spring Security, Oauth2 โœ”๏ธ Gen AI โœ” Typescript, Angular, Angular Material โœ” Javascript Working with me, you will: โœ” Get fast response and clear communication โœ” Beautiful and reusable code, intuitive, and functional interface applying all the best practices โœ” Developer familiar with DevOps practices and CI/CD pipelines. About My Skills: Backend: โœ… JAVA, Java EE, JUnits โœ… Gen AI โœ… Spring Frameworks (Spring Boot, Spring MVC, Spring Data JPA, Spring Security, etc) โœ… Spring Security, Oauth2, OpenID Connect (OIDC) โœ… Hibernate โœ… Servlet, JUnit, Jackson, Gson, Concurrency in Java โœ… REST API, Swagger/OpenAPI, Quartz, Lombok, REST, JSON, XML โœ… Apache Kafka โœ… Microservices CI/CD (DevOps) โœ… GIT, GitHub, GitLab โœ… GitHub Actions โœ… Docker โœ… Kubernetes โœ… Jenkins โœ… REST API โœ… AWS โœ… GKE Frontend: โœ… JavaScript, TypeScript โœ… React, Redux, Redux Toolkit, Saga, Thunk, Storybook โœ… Angular (2+), RxJS, NgRx โœ… Jest, Karma, Jasmine, Enzyme, React Testing Library, Cypress โœ… Javascript โœ… HTML, CSS, Bootstrap โœ… TailwindCSS Others: Software/tools/others; โœ… Database (DynamoDb, Azure SQL, Aure Cosmos, MySQL, Oracle, SQL SERVER) โœ… Maven, Gradle, TFS โœ… Oracle SQL Developer โœ… Amazon Cognito โœ… AWS Services โœ… GCP (Google Cloud Platform) โœ… Stripe โœ… Azure DevOps โœ… Nodejs (Express, NPM) โœ… Visual Studio, Visual Studio Code โœ… IntelliJ, eclipse, Atom, Android Studio โœ… mRemoteNG โœ… Tomcat โœ… Postman, SoapUI โœ… Unix, Linux โœ… JIRA, ClickUp Key Highlights: Expertise in backend development for websites and applications using Java and Spring Boot. Proficient in designing scalable, high-performance systems with PostgreSQL, Kafka, and Redis. Delivered business-initiated projects on time, contributing to organizational growth and efficiency. Skilled in troubleshooting, performance tuning, and ensuring system reliability using tools like Splunk. Adept at collaborating with cross-functional teams to solve complex problems and achieve project goals. Education: Graduated from the Indian Institute of Information Technology, Allahabad (IIIT-A), with a specialization in Information Technology. I have worked with high-profile Organizations in my career, including the following to illustrate some of them: โœ” Walmart Labs โœ” OYO Rooms โœ” Tata 1MG โœ” Samsung R&D

  • Java
  • Spring Boot
  • SQL
  • MongoDB
  • PostgreSQL
  • Kubernetes
  • Elasticsearch
  • Apache Kafka
  • Splunk
  • NoSQL Database
  • AWS Cloud9
  • Google Cloud Platform
  • Azure Cosmos DB
  • Python
  • Flask
Prasanna S.

Pune, India

$40/hr
5.0
9 jobs

I am a Senior Java Developer with 12+ years of experience designing, building, and maintaining scalable backend systems using Java, Spring Boot, and microservices architecture. I specialize in: โ€ข Spring Bootโ€“based microservices and RESTful APIs โ€ข Distributed systems (service decoupling, retries, fault isolation) โ€ข PostgreSQL, MySQL, MongoDB โ€“ schema design and performance tuning โ€ข Hibernate/JPA with clean and efficient data access patterns โ€ข API security, validation, and automated testing (JUnit, Mockito) โ€ข Docker, CI/CD pipelines, and AWS-based deployments AI & Intelligent Integrations: โ€ข Experience integrating REST-based AI/LLM APIs (GPT, Codex) into Java and Spring Boot backends โ€ข Using AI tools for code quality improvement, unit test generation, and developer productivity โ€ข Designing AI-enabled services while maintaining clean system boundaries, reliability, and scalability I have worked as a Lead Developer on enterprise-grade platforms in finance, compliance, healthcare, and e-commerce, where clean architecture, reliability, and long-term maintainability were critical. I can own backend architecture end-to-end or integrate seamlessly into an existing team and codebase.

  • Java
  • Spring Boot
  • Microservice
  • RESTful API
  • Hibernate
  • PostgreSQL
  • Docker
  • Amazon Web Services
  • JUnit
  • API Development
  • OpenAI API
  • OpenAI Codex
  • MongoDB
  • REST API
  • Google Cloud Platform
  • Git
  • Retrieval Augmented Generation
  • Claude
  • Artificial Intelligence
  • Full-Stack Development
Yinebeb T.

Addis Ababa, Ethiopia

$15/hr
5.0
9 jobs

I build scalable, high-performance backend systems that handle real-world complexity. Top Rated Plus with 4.5+ years delivering production-ready microservices, APIs, and distributed systems. Current & Recent Work: - MCP Server Hub - Distributed platform for managing MCP servers with microservices, Redis/Kafka messaging, and Nomad/Kubernetes orchestration - Software Factory - Autonomous coding pipeline with Temporal workflow orchestration and multi-agent LLM execution - SuperPlane - AWS CodeArtifact and Route53 integrations (open source) - Tinode Chat - Core contributor to open-source messaging platform Core Stack: Go(Golang) - Microservices - gRPC/REST APIs - PostgreSQL - Redis - Kafka - Docker - Kubernetes - Temporal - HashiCorp Vault/Consul Building from scratch or scaling existing systems - let's discuss how I can help deliver robust, maintainable solutions.

  • Golang
  • Microservice
  • REST API
  • Git
  • SQL
  • Websockets
  • PostgreSQL
Habtamu W.

Addis Ababa, Ethiopia

$15/hr
4.0
14 jobs

Senior Software Engineer with over a decade of expertise in architecting, developing, and deploying enterprise-grade, high-availability systems. Specialized in sophisticated backend architecture, full-stack development, and complex fintech integrations serving global markets. Proficient in Java and Spring Boot ecosystems, with deep expertise in event-driven and microservices architectures. Proven track record of designing and implementing secure, scalable, high-performance financial platforms that process millions of transactions while maintaining exceptional reliability and compliance standards. Demonstrated leadership in guiding development initiatives, mentoring engineering teams, and delivering innovative end-to-end solutions across financial services, telecommunications, and enterprise sectors. Passionate about leveraging cutting-edge technologies to solve complex business challenges and drive organizational success.

  • Spring Boot
  • Java
  • Spring Framework
  • C++
  • React
  • JavaScript
  • Apache Kafka
  • PostgreSQL
  • Microsoft SQL Server
  • CSS
  • Vue.js
  • RabbitMQ
  • AI Agent Development
  • Spring Cloud
  • Docker
  • Python
  • Kotlin
  • OAuth
  • Software Architecture & Design
  • Spring Security
Ghulam M.

Karachi, Pakistan

$35/hr
5.0
1 jobs

Iโ€™m a PACS Administrator with over 10 years of experience in Radiology and Cardiology imaging systems. I specialize in setting up, maintaining, and customizing PACS/RIS systems, including: โœ… dcm4chee (v2 and v5), Orthanc, Conquest Dicom Server โœ… OHIF, Weasis, MicroDicom , K-PACS, ClearCanvas and Oviyam dicom viewers โœ… Mirth Connect ,FHIR , EMR , VNA archiving โœ… Docker PACS deployments โœ… DICOM routing, storage, anonymization โœ… HL7 integration (with Radiology workflows) โœ… SQL Server, MySQL, PostgreSQL, MariaDB database tuning for PACS โœ… Windows, Linux (Debian, Ubuntu) for PACS deployment Iโ€™ve worked with hospitals, diagnostic centers, and teleradiology firms to: - Improve report turnaround time - Optimize imaging workflows - Reduce system downtimes - Set up secure remote access for radiologists ๐Ÿ’ก I can help you set up a fully remote, secure, and stable PACS system from scratch or optimize your existing infrastructure. Letโ€™s connect โ€” Iโ€™d love to help your clinic, startup, or imaging center run more efficiently and securely.

  • System Administration

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