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Emmanuella  C.

Emmanuella C.

Java Software Engineer | Spring Boot | JavaScript | TypeScript

I’m a Senior Software Engineer with over 4 years of experience delivering secure, scalable, and high-performance software solutions for startups, SMEs, and enterprises across industries such as e-commerce, fintech, blockchain, edtech, and food & beverage. My core focus is on backend development, API engineering, cloud-native applications, workflow automation, and AI-powered solutions, but I also bring full-stack expertise to deliver complete, production-ready systems. I hold a Bachelor’s degree in Computer Science and specialize in building robust, maintainable, and efficient backend architectures using Java, Spring Boot, Node.js, and TypeScript, integrated with high-performance databases like PostgreSQL, MySQL, MongoDB, and Redis. I’m highly skilled in RESTful API development, microservices architecture, asynchronous processing, and secure authentication (JWT, OAuth2, SSO). Core Technical Skills: Backend Development: Java, Spring Boot, Spring MVC, Jakarta EE, JavaFX, Node.js, Express.js, Python, Golang Frontend Development: React, Angular, Next.js, Thymeleaf, JSP/JSTL, Bootstrap, HTML5, CSS3, JavaScript, jQuery Databases: MySQL, PostgreSQL, MongoDB, Redis (NoSQL & SQL database design, query optimization, indexing, caching) Cloud & DevOps: AWS (EC2, S3, RDS, Lambda), Google Cloud Platform (GCP), Microsoft Azure, Docker, Kubernetes, CI/CD pipelines Messaging & Integration: RabbitMQ, Kafka, WebSockets, API Gateway integrations, GraphQL Automation & AI: n8n, Make (Integromat), Apify, PhantomBuster, OpenAI API, AI model integration, workflow orchestration Version Control & Collaboration: Git, GitHub, GitLab, Bitbucket, Agile/Scrum methodologies Achievements & Project Highlights: ✔ Built an e-commerce platform capable of handling 500+ daily transactions, reducing load times by 30% and lowering infrastructure costs by 15% through database optimization and caching strategies. ✔ Led a cloud migration project from legacy infrastructure to AWS, reducing operational costs by 25% while improving scalability and uptime. ✔ Developed an AI-powered study assistant for neurodivergent students, winning the AI for Social Good hackathon and improving engagement and retention rates. ✔ Created a data automation pipeline that processed and scored 1,300+ startup applications for Pitch2Win, enabling quick finalist selection and improving investor matching efficiency. ✔ Engineered a grant-winning platform for Babcock University’s community health project, helping secure $80K in funding. What I Bring to Your Project: ✔ Expert in API-first development, secure authentication, and microservices architecture ✔ Strong track record with data enrichment, web scraping, and workflow automation tools like n8n and Apify ✔ Proven ability to design cloud-native, fault-tolerant, and cost-optimized applications ✔ Deep experience in AI integration for lead generation, data analysis, and personalized user experiences ✔ Commitment to clear communication, on-time delivery, and scalable, future-proof code If you’re looking for a results-driven software engineer who can handle everything from custom backend architecture to AI-driven automation systems, I’d love to collaborate. Let’s discuss how I can turn your requirements into a solution that’s efficient, secure, and built for growth.

🇳🇬Lekki, Nigeria$35/hr100% JSS4.98 (13)Since May 2022

Earnings and projects

MRR
$54

Last 6 months ÷ 6

World#149,062 / 412k
🇳🇬Country#5,932 / 13.8k
Revenue, last 30 days
$250

Last 6 months: $326

World#77,903 / 412k
🇳🇬Country#2,351 / 13.8k
Total earnings
$3.6k

Billed in all: $3.6k

World#283,368 / 412k
🇳🇬Country#7,377 / 13.8k
Per project
$149

$163 in the last 6 months

World#283,927 / 412k
🇳🇬Country#9,350 / 13.8k
Projects, last 6 months
2
100% fixed0% hourly
World#88,922 / 412k
🇳🇬Country#5,057 / 13.8k
Projects in all
24

Across 26 contracts

96% fixed4% hourly
World#116,632 / 412k
🇳🇬Country#3,380 / 13.8k

Earnings, last 30 days

$3.6k+$250 earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$3.2k$3.4k$3.6k$3.8kOct 9Oct 24Nov 8

Skill rankings: Top 15% in Spring MVC

Ranked by MRR among everyone on Upwork with the skill.

  1. #15Java Servlet API81 freelancers · 🇳🇬 #1Top 19%
  2. #28JavaFX156 freelancers · 🇳🇬 #2Top 18%
  3. #36Spring MVC243 freelancers · 🇳🇬 #1Top 15%
  4. #51Spring Security248 freelancers · 🇳🇬 #1Top 21%
  5. #58Core Java275 freelancers · 🇳🇬 #1Top 21%
  6. #165Spring Framework880 freelancers · 🇳🇬 #1Top 19%
  7. #480MySQL Programming2,017 freelancers · 🇳🇬 #7Top 24%
  8. #501Spring Boot2,150 freelancers · 🇳🇬 #4Top 23%