.Net Developer

Key Responsibilities:

• Design and develop real-time transaction processing systems with end-to-end latency requirements below 300 milliseconds.

• Build highly resilient and scalable architectures capable of enriching transactions from approximately 10 on-premises and cloud-based data sources.

Develop and maintain event-driven streaming solutions using:

• Apache Kafka

• Apache Flink

• Kong API Gateway

Build and support real-time integrations using:

• AWS Glue

• AWS Lambda

• Amazon EventBridge

• HVR (Five Tran HVR)

• Design, build, and consume high-performance REST APIs using .NET/.NET Core.

• Implement resilient messaging, event processing, monitoring, and fault-tolerant patterns.

• Collaborate with cloud, infrastructure, and security teams to ensure scalability and reliability.

• Optimize system performance to meet stringent SLAs and low-latency requirements.
  
  

Required Technical Skills

Real-Time Processing:

• Proven experience building real-time distributed systems.

• Demonstrated experience delivering transaction round-trip times under 300 milliseconds.

• Experience enriching transactions using multiple internal and external data sources.

Streaming & Messaging:

• Apache Kafka

• Topic design

• Consumer groups

• Stream processing

• Custom Kafka business logic

• Apache Flink

• Stateful stream processing

• Event-time processing

• Windowing

• Low-latency data pipelines

API & Integration Technologies:

• Kong API Gateway

• REST APIs

• Microservices Architecture

• .NET / .NET Core / C#

AWS Technologies:

• AWS Glue

• AWS Lambda

• Amazon EventBridge

• Cloud-native event-driven architectures

• Integration between on-premises and cloud platforms

Data Replication & Integration:

• HVR (High Volume Replication/Fivetran HVR)

• Real-time data synchronization and replication strategies

• Security & Network Intelligence Requirements

The candidate should possess experience in:

• IP reputation and risk analysis

Identifying and classifying traffic originating from:

• TOR networks

• Proxy servers

• VPN services

• Fraud detection or cybersecurity-related enrichment services

• Integration of threat intelligence and geolocation services into transaction workflows
  
  

Preferred Qualifications:

• Experience in payments, fintech, banking, fraud prevention, or risk management systems.

• Experience operating systems with high transaction volumes and strict SLA requirements.

• Strong understanding of resiliency patterns, fault tolerance, and distributed architectures.

• Knowledge of observability, monitoring, and performance tuning.
  
  

Screening Questions:

• Have you built or supported a real-time transaction processing system where end-to-end response time was less than 300 milliseconds

• How many enrichment sources were involved, and were they cloud-based, on-premises, or both

• Describe your hands-on experience with Apache Flink.

• Describe your experience designing and implementing Kafka-based business logic.

• Have you worked with Kong API Gateway Please provide examples.

• What experience do you have with AWS Glue, Lambda, EventBridge, and HVR

• Have you built and consumed high-volume real-time APIs using .NET/.NET Core

• Have you implemented solutions to detect whether an IP address originates from a TOR network, Proxy, or VPN

• Are you currently located in Austin or willing to remain in Austin for the duration of the engagement

• What is your earliest available joining date
  
  

Mandatory Requirements Summary:

• Real-time systems (300ms latency)

• Apache Kafka

• Apache Flink

• Kong API Gateway

• AWS Glue

• AWS Lambda

• Amazon EventBridge

• HVR

• .NET / .NET Core APIs

• TOR / Proxy / VPN detection knowledge

• Onsite in Austin throughout project duration

• Immediate to short-notice availability preferred (state joining timeline)
  
  

Must have skills:

• Excellent knowledge of C# with Multi-threading, Async.

• Good command over OOP concepts, SOLID principles, Design patterns.

• Experience in REST API/Microservices using ASP .Net WebAPI. Only ASP.Net MVC is not acceptable.

• Securing web applications using Authentication Tokens, Certificates, OAuth etc.

• Caching, Distributed caching.

• Pub/Sub, Queues/Topics Message Broker, Any one Queuing system.

• SQL Server knowledge, Joins, Stored Procedures, Functions, writing complex queries. SSIS/SSRS

• Experience on Lambda, CloudWatch, API Gateway, S3 Bucket, EC2, SNS, SQS, ELB, Docker/Kubernetes & Kafka MQ, IAM, Authorization, and Access control, SaaS etc.
  
  

Good to Have Skills (Secondary Skils):

• Business communication, client facing and consulting experience, coordination and navigating with stake holders and offshore team, solutioning mindset.

The pay range that the employer in good faith reasonably expects to pay for this position is $41.61/hour - $65.01/hour. Our benefits include medical, dental, vision and retirement benefits. Applications will be accepted on an ongoing basis.

Tundra Technical Solutions is among North America’s leading providers of Staffing and Consulting Services. Our success and our clients’ success are built on a foundation of service excellence. We are an equal opportunity employer, and we do not discriminate on the basis of race, religion, color, national origin, sex, sexual orientation, age, veteran status, disability, genetic information, or other applicable legally protected characteristic. Qualified applicants with arrest or conviction records will be considered for employment in accordance with applicable law, including the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. Unincorporated LA County workers: we reasonably believe that criminal history may have a direct, adverse and negative relationship with the following job duties, potentially resulting in the withdrawal of a conditional offer of employment: client provided property, including hardware (both of which may include data) entrusted to you from theft, loss or damage; return all portable client computer hardware in your possession (including the data contained therein) upon completion of the assignment, and; maintain the confidentiality of client proprietary, confidential, or non-public information. In addition, job duties require access to secure and protected client information technology systems and related data security obligations.

Salary : $42 - $65