Software Developer — Tax Systems

Software Developer — Tax Systems & ICT Solutions

Backend & Full-Stack Engineering | e-Filing, e-Invoicing, Revenue Collection | Secure Government-Grade Platforms

I design and build scalable tax technology: e-filing platforms, e-invoicing integrations, revenue dashboards, and APIs that connect banks, payment gateways, and government systems. My focus is secure architecture, reliable data pipelines, and developer-friendly documentation that teams can maintain.

Core strengths: solution architecture, clean APIs, CI/CD, SQL optimization, and domain knowledge across VAT, withholding, and returns.

Contact

td@chatgategroup.com
+255 745 500 022
Dar es Salaam, Tanzania
linkedin.c

Key Skills

Languages
  • Python, Java, JavaScript/TypeScript
  • SQL (PostgreSQL, Oracle, SQL Server)
  • Bash, YAML (CI/CD)
Frameworks & Tools
  • Django / FastAPI, Spring Boot
  • React (Admin UIs), Node.js
  • Docker, Kubernetes (basics), Nginx
  • Git, GitHub Actions, Jenkins
Data & Integrations
  • ETL/ELT, Data Warehousing, APIs
  • Bank & Payment Gateway Integrations
  • Messaging (RabbitMQ/Kafka), Caching (Redis)
Security & Domain
  • OAuth2/OpenID, JWT, RBAC
  • Audit Trails, Encryption at Rest/In Transit
  • Tax Domain: e-Filing, e-Invoicing, VAT, Withholding

Featured Projects

National e-Filing Platform
National e-Filing Platform

Online returns & payments with validations, receipts, and status tracking…

Real-Time e-Invoicing Integration
Real-Time e-Invoicing Integration

Digitally signed invoices, streaming ingestion, VAT compliance…

Revenue Collection Dashboard
Revenue Collection Dashboard

Data pipelines + BI for real-time visibility and reconciliation…

Payment Gateway Integration
Bank & PSP Payment Gateway Integration

Secure tax payment flows with automated reconciliation…

VAT Refund Automation
VAT Refund Automation (RPA)

Bots for checks, validations, and audit evidence…

Case Studies

Tax Filing & Compliance Platform
Tax Filing & Compliance Platform

Business Problem: Paper-based filing caused bottlenecks, data entry errors, and compliance delays.

ICT Solution: Built a secure web platform with automated validations, e-payment integration, and real-time submission tracking.

My Role: System architecture, backend APIs (FastAPI), PostgreSQL schema design, Redis caching, Dockerized deployment, CI/CD.

Results: Filing time ↓ 60%, validation errors ↓ 80%, digital adoption > 85% in year one.

Revenue Collection Dashboard
Revenue Collection Dashboard

Business Problem: Disparate tax systems limited visibility of collections and slowed decisions.

ICT Solution: Developed ETL pipelines to consolidate data and delivered a KPI dashboard with drill-downs by region, tax type, and channel.

My Role: Data modeling, SQL optimization, Python ETL, Power BI modeling and DAX, role-based access.

Results: Reconciliation time ↓ 50%, proactive anomaly detection ↑, executive reporting on-demand.

Tax Risk & Fraud Analytics
Tax Risk & Fraud Analytics

Business Problem: Underreporting and fraudulent claims escaped manual reviews.

ICT Solution: Created anomaly detection and risk scoring models; integrated alerts into audit workflow with case management APIs.

My Role: Feature engineering, model training/validation, API integration, audit trail logging, monitoring.

Results: Fraud detection ↑ 60%, targeted audits 2× more effective, compliance gaps reduced.

e-Invoicing & Real-Time Reporting
e-Invoicing & Real-Time Reporting

Business Problem: Manual invoice validation delayed VAT reporting and increased errors.

ICT Solution: Built a high-throughput microservice with digital signatures, message queues, and schema validation to ingest and verify invoices in real-time.

My Role: Spring Boot microservices, Kafka streams, PKI/HSM integration, Oracle schema design, horizontal scaling.

Results: Throughput ↑ 5×, validation errors ↓ 70%, VAT reporting available within minutes.

Education

Bachelor of Business Information and Communication Technology

Focus on Software Engineering, Databases, and Distributed Systems.

Capstone: Secure API gateway for government services (OAuth2, rate limiting, audit logs).

Certifications & Training

Volunteer — Open GovTech & Community

GovTech Meetups (Mentor/Contributor)

Contributed templates for API standards, logging/audit patterns, and ETL best practices for public-sector developers; ran workshops on secure REST design and CI/CD.

Hire Me!