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Professional Resume
Download PDFPDFSenior Backend Engineer
donatusgwer@gmail.com
+234 811 627 6212
Donatus
Gwer
83%
Tests
TxCore suite
200
Load
Concurrent users
40%
Perf
Lazy loading + query opt
~40%
Speed
Faster with AI
HMAC
Secure
Constant-time
10k→2
Recon
Queries per batch
StackPythonDjangoFastAPIPostgreSQLRedisKafkaDockerStripe
Profile
Backend engineer with 5+ years building payment infrastructure, financial reconciliation systems, and event-driven SaaS platforms. Founder of GITS, a software agency delivering production systems for African and global markets. Designs systems around failure modes first — idempotency, observability, and resilience are not afterthoughts. Works AI-augmented daily: uses LLMs for architecture review, code generation, test coverage, and documentation. Actively targeting senior backend roles at fintech and globally distributed engineering teams.
Architecture Principles
Security First
HMAC-SHA256 validation, constant-time comparison, RBAC
Data Integrity
Idempotency keys, reconciliation engines, bulk ops
Observability
Prometheus metrics, structured logging, SLA monitoring
Performance
Query optimisation, N+1 elimination, lazy loading
Resilience
Exponential backoff, circuit breakers, retry policies
Scalability
Event-driven architecture, Kafka, Celery workers
Experience
2022 – Present
GITS — Gwer Intelligent Tech Solutions
Founder & Lead Engineer- Founded and operate a software agency delivering production-grade web and backend systems for clients in Nigeria and internationally.
- Architected and shipped 5+ full-stack products including multi-tenant SaaS platforms, payment-integrated marketplaces, and AI-powered chat interfaces.
- Built AI-augmented delivery workflow: use LLMs for architecture review, boilerplate generation, test coverage, and client documentation — reducing delivery time by ~40%.
- Clients include NOTGATE (Nigerian construction firm), Lamed Pharmacy, and multiple FinTech-adjacent startups.
2025
TxCore (Open Source)
Backend Engineer — Founder Project- Built a production-grade distributed payment processing system to demonstrate senior-level fintech backend patterns.
- Implemented Redis-backed idempotency key store — prevents duplicate transactions on client retry without DB uniqueness constraint errors.
- Built HMAC-SHA256 webhook validation with constant-time comparison (hmac.compare_digest) — closes timing attack vector missed in naive implementations.
- Designed CSV reconciliation engine using bulk DB fetch and bulk_create() — reduces 10,000-row reconciliation from ~10,000 queries to 2.
- Kafka event bus decouples API from async workers; Celery settlement worker uses exponential backoff to prevent retry storms.
- 29 tests at 83% coverage · Prometheus metrics · Locust load tested at 200 concurrent users · GitHub Actions CI/CD.
2025 – Present
Proova — Revenue Attribution SaaS
Full-Stack Engineer — Founder Project- Building a revenue attribution platform for African e-commerce tracking sales across WhatsApp, DMs, influencers, and offline channels.
- Designed hybrid deterministic/probabilistic attribution engine combining click-tracking with reference code matching.
- Built CSV financial reconciliation pipeline matching bank transactions to tracked attribution events.
- Integrated Stripe and Paystack for global and Nigerian market SaaS billing.
2024 – 2025
FinOps Operations Console
Backend Engineer — Founder Project- Built financial operations platform for managing refunds, disputes, and payment investigations at scale.
- Implemented multi-tenant workspace architecture with strict data isolation between company accounts.
- Built automated refund risk classification engine detecting SLA breaches and flagging at-risk transactions.
- Created financial export system for reporting, audit trails, and reconciliation workflows.
2025
Naija Co-op Hub
Backend Developer — Founder Project- Designed backend for cooperative savings marketplace with escrow-backed transaction flows.
- Implemented Paystack webhook validation and secure payment workflows.
- Built real-time messaging with Django Channels and Redis caching for query optimisation.
- Role-based access control across member, admin, and cooperative manager user types.
2023 – 2024
ThriftbyZee & Client Projects
Freelance Backend Developer- Built REST APIs for product listings, filtering, and e-commerce workflows.
- Improved page performance by 40% through lazy loading and query optimisation.
- Automated CI/CD pipelines with GitHub Actions; maintained deployments on Netlify and Render.
Key Projects
TxCore
Distributed payment processing system · Django · Kafka · Celery · PostgreSQL · Redis · Prometheus
29 tests · 83% coverage · 200 concurrent users · full CI/CD
drift-recon
Financial reconciliation system · FastAPI · PostgreSQL · Redis · Nginx · Streamlit
Docker Compose stack · CI/CD via GHCR · operational runbooks
Proova
Revenue attribution SaaS for African e-commerce · Django · Stripe · Paystack
Tracks revenue across WhatsApp, DMs, influencers, offline channels
Technical Skills
Backend
PythonDjangoDRFFastAPICeleryAsync
Payments
StripePaystackHMACIdempotencyReconEscrow
Data
PostgreSQLRedisQuery OptBulk OpsN+1 Fix
Distributed
KafkaEvent-DrivenWorkersBackoffSLA
Observability
PrometheusGrafanaMetricsLocustLogging
Infra
DockerComposeGH ActionsNginxRenderVPS
Frontend
ReactNext.jsTypeScriptTailwindMotion
AI & LLMs
Claude APIAnthropic SDKPrompt EngAI ReviewTests
Open Source
Certifications
Django Full Stack Web Dev — Udemy
100 Days of Code Bootcamp — Udemy
Responsive Web Design — freeCodeCamp
Education
B.A. Philosophy
Benue State University
Logic, reasoning, structured problem solving
Working Style
“Designs around failure modes before writing code. Treats observability as a first-class concern. Uses AI tools daily as a force multiplier — not to replace engineering judgment but to increase the surface area of what one engineer can confidently ship and maintain. Comfortable owning features end-to-end across database, API, worker, and infrastructure.”
AI-Augmented Developer
“Designs around failure modes before writing code. Treats observability as a first-class concern. Uses AI tools daily as a force multiplier — not to replace engineering judgment but to increase the surface area of what one engineer can confidently ship and maintain. Comfortable owning features end-to-end across database, API, worker, and infrastructure.”
© 2026 Donatus Gwer. Built with Next.js & Tailwind.
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