About Oluwasegun
I build scalable backend systems for B2B SaaS companies in fintech and workplace tech.
EXPERTISE:
- Microservices architecture (Go, TypeScript/Node.js)
- API design and integration (REST, GraphQL)
- Cloud infrastructure (AWS, GCP, Azure)
- System scaling and migration
RECENT PROJECTS:
- Payment infrastructure at Forto (fintech)
- Workplace management systems at Seatti and Lendis
- Data aggregation platform at Atlas Metrics
Looking for 3-6 month contracts with B2B SaaS companies.
English
Native or bilingual
Remote only
Primarily works remotely
Experience
- Forto GmbH,Senior Software EngineerLOGISTICS AND SUPPLY CHAINDecember 2023 - Today (2 years and 6 months)Berlin, Germany• ● Led the implementation of a scalable VAT handling system for multiple countries, ensuring tax compliance and reducing manual reconciliation by 80%.• ● Collaborated with product and finance teams to design API contracts and build secure microservices using NestJS, Kubernetes, GCP PUB/SUB and AWS SNS, SQS.• ● Developed CLI tools that accelerated local and CI testing workflows, significantly reducing deployment cycles and increasing confidence before production pushes.• ● Improved testing pipeline by introducing mocks and builders, resulting in a 50% reduction in test flakiness.• ● Enhanced observability and monitoring through Datadog dashboards and alerting across services.• ● Participated in design reviews and mentored junior developers on testing strategies and clean architecture.• ● Tech Stack: NestJS, Node.js, Reactjs, AWS (SNS, SQS), GCP (Pub/Sub), Kubernetes, MongoDB, PostgreSQL, GitHub Actions, Datadog
- DemoUp Cliplister GmbH,Senior Backend EngineerJanuary 2023 - November 2023 (10 months)Berlin-Brücke, Pforzheim, BW, Germany• ● Developed and maintained cloud-native services for transforming and delivering digital assets used by global e-commerce platforms.• ● Migrated core systems from legacy infrastructure to serverless and containerized architecture using AWS, improving system reliability and cutting deployment overhead.• ● Collaborated with DevOps to automate deployments via Terraform and GitHub Actions, ensuring consistent and reproducible environments.• ● Contributed to architectural discussions around event-driven design and domain boundaries.• ● Tech Stack: Node.js, TypeScript, AWS Services (CDK, Lambda, S3, SNS, SQS, RDS, DynamoDB, Aurora, Fargate), Kubernetes, PostgreSQL
- Lendis GmbH,Senior Software EngineerJune 2021 - January 2023 (1 year and 7 months)Berlin, Germany• ● Migrated finance and logistics modules from a monolith to AWS microservices increasing deployment frequency by 3x.• ● Designed and integrated Salesforce and Chargebee APIs, automating over 95% of manual financial operations.• ● Worked cross-functionally with logistics and finance teams to deliver reliable backend services.• ● Tech Stack: Node.js, TypeScript, Reactjs, PHP, AWS CDK, API Gateway, Lambda, DynamoDB, PostgreSQL
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Education
- AWS Certified Solutions Architect – AssociateAWS Certified Solutions Architect – Associate
- AWS Certified Developer – AssociateAWS Certified Developer – Associate