Senior Software Developer

Postalia Belgium NV; Brussel Hoofdstad; Hybrid; EUR 80,000 - 110,000; Full time

Benefits offered by this job

Meal vouchers

Hospitalisation insurance

Net allowance

Car

Laptop

Job summary

EasyPost is seeking a hands-on Senior Software Developer to help build and operate our secure document-delivery platform. You will own features from design to production, focusing on backend and cloud engineering with TypeScript on AWS.

You will design and develop TypeScript services, AWS Lambda functions and NestJS APIs, build serverless infrastructure with AWS CDK, and mentor teammates while shaping the platform's architecture. Hybrid schedule in Brussels (Neder-over-Heembeek).

Qualifications

• Experience building backend services with TypeScript.
• Strong background in serverless architectures on AWS.
• Ability to design secure, reliable systems and mentor teammates.

Responsibilities

• Design and develop TypeScript services, AWS Lambda functions and NestJS APIs.
• Build and maintain serverless infrastructure using AWS CDK.
• Translate business requirements into technical designs with the team lead.
• Contribute to architectural decisions and document trade-offs.
• Create resilient event-driven workflows handling retries and partial failures.
• Integrate with external e-invoicing and e-delivery providers via APIs.
• Work with AWS services such as Lambda, DynamoDB, EventBridge, SQS, Step Functions, API Gateway, S3 and CloudWatch.
• Apply security practices including encryption and audit logging.
• Write unit, integration and end-to-end tests with Jest.
• Monitor production systems and mentor colleagues to raise standards.

Skills

TypeScript

AWS

Mentoring

Tools

NestJS

AWS CDK

DynamoDB

EventBridge

SQS

Step Functions

API Gateway

S3

CloudWatch

Jest

Job description

EasyPost is looking for a hands‑on Senior Software Developer to help build and operate our secure document-delivery platform.

Our customers use EasyPost to send invoices and business documents through channels such as Peppol e-invoicing, Belgian eBox, electronic registered delivery, e-signing, email and print. Behind this experience is a large event-driven AWS platform that processes sensitive documents, integrates with external providers and coordinates long-running delivery workflows.

Our business model is exactly as our name suggests. Easy! By working with us, businesses and public sector organisations not only save money, but also time.

You will take ownership of features from technical design through production. This role focuses on backend and cloud engineering. You will work closely with our team lead, product management and other engineers to design reliable, secure and maintainable solutions.

As one of the team’s senior engineers, you will also help shape the platform’s architecture, evaluate technical trade-offs and turn business requirements into practical technical designs.

What you will do

• Design and develop TypeScript services, AWS Lambda functions and NestJS APIs.

• Build and maintain serverless infrastructure using AWS CDK.

• Translate business requirements into clear technical designs together with the team lead.

• Contribute to architectural decisions and document their context, trade-offs and consequences.

• Create resilient event-driven workflows that handle retries, duplicate events, timeouts, concurrency and partial failures.

• Integrate with external e-invoicing, e-delivery and e-signing providers through APIs and webhooks.

• Work with AWS services such as Lambda, DynamoDB, EventBridge, SQS, Step Functions, API Gateway, S3 and CloudWatch.

• Apply security practices including encryption, least-privilege access, audit logging and safe handling of sensitive data.

• Write unit, integration and end-to-end tests using Jest.

• Monitor production systems and investigate issues across application code, AWS infrastructure and external integrations.

• Review code, mentor colleagues and raise engineering standards across the team.

• Improve our development, CI/CD and deployment processes.

• Collaborate with frontend engineers to ensure backend services and APIs support complete, reliable user journeys.

What we have to offer

You’ll be joining a dynamic environment that offers opportunities for personal development. You’ll work in a trendy, open-plan workspace that’s inspiring and comfortable. Our offices in Brussels (Neder-over-Heembeek) are easily accessible by car or public transport.

Hybrid schedule: 3 days at th office/2 days working from home

We offer a full-time contract, combined with an attractive salary package and fringe benefits such as meal vouchers, hospitalisation insurance, net allowance, car, laptop, …

Interested? Let’s talk!