David Nwaekwu

Back End Engineer at Terra ce

Built distributed data ingestion and real-time microservices processing 40 GB+/day of Ethereum/Solana logs; materialized multi-interval time-series (OHLC) and pushed sub-millisecond WebSocket updates to 10k+ users.

Back End Engineer at Verbena Logic

Designed and deployed OAuth 2.0 provider, enabling secure internal service communication and single-sign-on; designed RESTful and gRPC microservices powering real-time APIs with sub-100ms latency; containerized all microservices with Docker and established a multi-stage build pipeline; integrated Stripe/PayPal payment gateways to streamline transactions.

Back End Engineer at Therapi

Mitigated timeouts when downloading large reports by designing an asynchronous report system across three microservices; migrated data through AWS S3 and Redis queues; improved system performance, reliability, and throughput; applied algorithmic optimizations in data processing.

Data Engineer at Upwork

Real-time fintech pipeline: designed streaming pipeline with Apache Kafka (MSK) → Spark Structured Streaming → S3/Parquet; end-to-end latency reduced to ~150 ms; unified 15+ data sources into an AWS data lake (S3 + Glue Catalog); built dimensional data marts enabling BI and product analytics.

Backend Engineer at A3get

Engineered a slide generation application improving student–teacher interaction by 71%; implemented file extraction service for audio, video, PDFs, documents, and handwritten notes using Node.js and Azure; led translation of slide content into three Nigerian Indigenous languages to enable access for students; designed and built a virtual wallet system enabling multi-currency cross-border transactions and seamless CI/CD deployments on AWS.

Backend Engineer at Terrace (High-Frequency Trading Platform)

Built distributed data ingestion and real-time microservices processing 40 GB+/day of Ethereum/Solana logs; materialized multi-interval time-series (OHLC) and push sub-ms WebSocket updates to 10k+ users.

Backend Engineer at Verbena Logic

Designed and deployed custom OAuth 2.0 provider; secured communication between internal services and streaming user authentication via Single Sign-On (SSO) with external providers. Implemented RESTful and gRPC microservices powering real-time APIs serving 50k+ daily requests; containerized microservices using Docker and established multi-stage build pipelines reducing image sizes by 60% and improving deployment times. Integrated payment gateways (Stripe, Paystack) streamlining user transactions by 50%. Implemented RAG AI-powered system enabling access to essential company documentation.

Backend Engineer at Therapi

Mitigated timeout issues when downloading large reports by developing asynchronous report download system leveraging AWS S3 and Redis Queues. Implemented microservices architecture with security APIs and payment gateways; improved system performance and reliability; optimized data processing algorithms to reduce response times under heavy workloads.

Data Engineer at Upwork

Real-time fintech pipeline: designed a streaming data pipeline with Apache Kafka (MSK) → Spark Streaming → S3/Parquet; cut end-to-end processing latency by 150 ms, enabling faster trading decisions and throughput optimization via partitioning and compression. Healthcare data integration: unified 15+ disparate data sources into an AWS data lake (S3/Parquet + Glue Catalog); standardized models and transformations to reduce weekly reporting effort by 6 hours and improve data reliability. E-commerce ELT to Redshift: authored Airflow DAGs orchestrating S3 → Redshift loads (COPY), incremental loads and quality checks, and built dimensional data marts powering actionable BI and product analytics. Hardened pipelines with CI/CD (GitHub Actions), observability (CloudWatch metrics/alerts).

Backend Engineer at A3get

Engineered a slide generation application that improved student and teacher educational interaction by 71%. Implemented a file extraction service for audio, video, typed documents and handwritten notes using Node.js and Azure. Led slide content translation into 3 Nigerian Indigenous languages, enabling Nigerian students to consume educational content in their best-known indigenous language. Designed and built a virtual wallet system enabling users to create accounts, perform multi-currency, cross-border transactions and manage seamless deployment operations using Docker, CI/CD and AWS services.

Backend Engineer at Terrace

Built distributed data ingestion and real-time microservices processing 40+ GB/day of Ethereum/Solana logs; implemented multi-interval time-series (OHLC) and push sub-ms WebSocket updates to 10k+ users. Architected high-frequency trading analytics with low-latency pipelines, aggregating millions of DeFi/CeFi order-book snapshots to compute liquidity with sub-ms service times. Built security/risk microservice integrating GoPlus to score contracts/tokens, blacklist malicious assets in real time, and emit metrics/alerts for downstream consumers. Optimized batch/stream pipelines via concurrent tuning and batching, boosting throughput by 81% and cutting end-to-end latency by 70% while maintaining 99.9% data accuracy. Delivered passwordless authentication using crypto-signature verification (secp256k1/K eccak256, ed25519) to harden API access with no secrets. Established observability & reliability: Prometheus/Grafana dashboards, alerting, error budgets; participated in on-call to resolve pr

Backend Engineer at Verbena Logic

Designed and implemented a custom OAuth 2.0 provider with secure inter-service communication and SSO. Designed and deployed RESTful and gRPC microservices powering real-time APIs that served 50k+ daily requests with sub-100ms latency. Containerized microservices using Docker and established a multi-stage build pipeline that reduced image sizes by ~60% and improved deployment times. Integrated payment gateways (Stripe, Paystack) to streamline user transactions by ~50%. Implemented a Retrieval-Augmented Generation (RAG) AI-powered system to improve accessibility and usability of company documentation for developers.

Backend Engineer at Therapi

Mitigated timeouts when downloading large reports by developing an asynchronous report-download system leveraging AWS S3 and Redis queues. Increased scalability by implementing three microservices (Email, SMS, Real-Time Push Notifications) offloading requests from the main server, managing database migrations with Alembic and data validation with Pandas. Implemented microservices architecture and integrated with payment gateways; enhanced system reliability and throughput.

Data Engineer at Upwork

Real-time fintech data pipeline: designed a streaming data pipeline with Apache Kafka (MSK) → Spark Structured Streaming → S3/Parquet, reducing end-to-end latency by 150 ms and improving throughput via partitioning and compression. Healthcare data integration: unified 15+ disparate data sources using Python + Spark into an AWS data lake (S3/Parquet + Glue Catalog); standardized models and transformations to reduce weekly reporting effort and improve data reliability. E-commerce ELT to Redshift: authored Airflow DAGs orchestrating S3 → Redshift loads (COPY), implemented incremental loads and quality checks, and built dimensional data marts powering BI and product analytics. Hardened pipelines with CI/CD (GitHub Actions) and observability (CloudWatch metrics/alerts).

Backend Engineer at A3get

Engineered a slide generation application that improved student-teacher educational interaction by 71%. Implemented a file extraction service for audio, video, documents, and handwritten notes using Node.js and Azure. Led slide content translation into three Nigerian Indigenous languages, enabling students to consume educational content in their local language. Designed and built a virtual wallet system enabling multi-currency, cross-border transactions, deployed with Docker, CI/CD, and AWS services.

Backend Engineer at Terrace High-Frequency Trading Platform

Built distributed data ingestion and real-time microservices processing 40GB+/day of Ethereum/Solana logs; implemented multi-interval OHLC time-series with materialization; pushed sub-ms WebSocket updates to 10k+ users; contributed to a high-frequency trading analytics platform; built security/risk microservice integrating GoPlus to score contracts/tokens, blacklist malicious assets in real time, and emit metrics/alerts; optimized batch/stream pipelines via concurrency tuning and batching; delivered passwordless authentication using crypto-signature verification; established observability with Prometheus/Grafana dashboards and on-call incident resolution.

Backend Engineer at Verba Logic

Designed and deployed a custom OAuth 2.0 provider with secure internal service communication and streaming Single Sign-On; designed RESTful and gRPC microservices handling 50k+ daily requests with sub-100ms latency; containerized multiple microservices; integrated payment gateways and improved system reliability and deployment efficiency.

Backend Engineer at Therapi

Mitigated timeouts when downloading large reports by building asynchronous report download system leveraging AWS S3 and Redis Queues; increased scalability by implementing three microservices (Email, SMS and Real-Time Push Notifications) offloading; performed database migrations with Alembic and data validation with Python; implemented and optimized microservices architectures integrated with third-party APIs and payment gateways; improved throughput by 30% and reliability; applied algorithms to data processing.

Data Engineer at Upwork

Real-time fintech data pipeline: streaming data pipeline with Apache Kafka (MSK) → Spark Structured Streaming → S3/Parquet; cut end-to-end processing latency by 150 ms; integrated 15+ disparate data sources into an AWS data lake; created data marts powering BI and product analytics; hardened pipelines with CI/CD (GitHub Actions) and observability (CloudWatch metrics/alerts).