Brazil
C6 Bank
Stark Bank
Senior Software Engineer - Acquiring
Brazil
São Paulo, São Paulo, Brazil
GCP
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About Stark Bank
At Stark Bank, we are more than just a digital bank for businesses: we are strategic partners who, since 2018, have been redefining the future of corporate financial services in Brazil. We offer a complete range of services, from agile payment and invoice processing to intelligent accounts receivable management, all integrated and automated through a robust and innovative API. We are not content with just optimizing processes; we aim to become the largest financial technology bank, empowering businesses to thrive with solutions that eliminate bureaucracy and boost efficiency.
We believe that the key to revolutionizing the financial system lies in our relentless pursuit of innovation and our ability to transform complex problems into impactful solutions. Every line of code, every new feature we develop, is designed to allow companies to focus on what truly matters: strategy and growth.
Our legacy is ambitious: to build the best banking ecosystem in technology and service for businesses in Brazil. And to achieve this vision, we need curious, persistent, and passionate minds for challenges. If you identify with the meticulousness, consistency, and persistence that drive us, if you believe in continuous improvement and place the customer at the center of your actions, and if you seek a collaborative and challenging environment where ambition meets the opportunity to scale, Stark Bank is your place.
The Squad
Our Acquiring Squad is responsible for developing and maintaining all the infrastructure that enables card transaction processing at Stark Bank and Stark Infra — including authorization, capture, settlement, fraud prevention, and reconciliation. We work daily to ensure that millions of transactions pass through our systems securely, with low latency, and extremely high availability.
Our mission is to offer a modern, simple, and highly performant acquiring platform, allowing companies to operate card payments like true fintechs.
The Challenge
As an Acquiring Developer, you will be instrumental in building and evolving the systems that support our card stack. This includes dealing with critical protocols, complex integrations with card networks and sub-acquirers, as well as settlement and reconciliation flows that handle large financial volumes.
You will
- Plan, develop, and scale APIs and services for the entire acquiring transaction cycle (authorization, capture, cancellation, chargeback, settlement).
- Evolve integrations with card providers, networks, issuers, and gateways, ensuring compliance with protocols such as ISO 8583, authorization APIs, clearing & settlement, among others.
- Build asynchronous systems for automated financial reconciliation between acquirer–network–merchant.
- Implement and maintain rule engines for fraud prevention and risk management, ensuring response within critical latency.
- Develop data pipelines for generating statements, settlements, financial reports, and risk insights.
- Continuously optimize performance: reduce latency, increase throughput, and minimize cloud resources.
- Eliminate operational noise through automation, proactive monitoring, circuit breakers, alerts, and advanced observability.
- Participate in war rooms during critical incidents, acting in debugging and mitigation in production.
- Write clean, efficient, and sustainable code that other engineers love to maintain.
Minimum requirements
What you need
- Solid experience in software development.
- Familiarity with serverless architectures, microservices, and event-driven design.
- Experience with extremely high transactional volume systems and strict latency SLAs (authorization in milliseconds).
- Experience with asynchronous messaging, retry queues, and dead-letter handling.
- Ability to quickly understand existing systems by reading clean and standardized code.
- DevOps mindset: cloud management, cost optimization, observability, and monitoring.
- Lean mentality: remove complexity, simplify, and deliver efficiently.
- Ability to translate payment business rules into robust and scalable solutions.
What will make you stand out
- Experience with GCP: Cloud Run, Cloud Functions, Pub/Sub, Cloud Tasks, Cloud Scheduler.
- Experience with acquiring protocols: ISO 8583, authorization messages, chargebacks, clearing, and reconciliation.
- Knowledge of the card ecosystem: networks (Visa, Mastercard), schemes, issuers, sub-acquiring.
- Experience with fraud prevention, risk models, decision engines, and tokenization (PCI DSS).
- Mastery of settlement processes: settlements, funding, multi-merchant reconciliation.
- Knowledge of standards like ISO 20022, integration with CIP, SLC, and electronic payment models.
- Previous experience in fintechs, acquirers, gateways, or payment companies.
What We Offer
At Stark Bank, we invest in your success and believe in a work environment where you can thrive. In addition to a challenging and innovative environment, we offer:
Our benefits
- Attractive monthly salary compared to the market.
- Housing assistance (according to office distance policy).
- Medical and dental insurance.
- TotalPass to take care of your physical health.
- Stark credit card for Meal Vouchers and Food Vouchers, offering flexibility in your daily life.
- Transportation voucher or parking space to facilitate your commute.
- Uber voucher for round trips in specific situations.
Work Model
We operate in a 100% in-person model, and you will be part of our incredible team in the heart of São Paulo: Rua Pamplona, 145 - Cerqueira César, São Paulo - SP.
Come be Stark!
If you identify with our purpose and want to make a difference in the future of financial services for businesses, apply!
Want to know more about Stark Bank?
Follow us on social media:
- Linkedin Stark Bank and Linkedin Stark Infra;
- Visit our website and test our product via Sandbox;
- Learn more about us on our Blog;
- Follow us on Instagram @starkbank.
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