Full-Time

Senior Site Reliability Engineer

Mongodb, Cassandra

Posted on 11/28/2025

Visa

Visa

10,001+ employees

Global digital payments network processing transactions

No salary listed

Basingstoke, UK

Hybrid

Hybrid position; days in office to be confirmed by Hiring Manager.

Category
DevOps & Infrastructure (1)
Required Skills
Redis
MongoDB
Linux/Unix
Cassandra
Requirements
  • Bachelors Degree in Computer Science or other technology field, or equivalent professional experience.
  • Good UNIX platform skills and a general understanding of network, storage, tiered application environments and security.
  • Mid-level Production Database Administrator experience on Cassandra, Mongo and Redis.
  • Strong record of troubleshooting database production problems and connectivity issues.
  • Good interpersonal skills along with effective communication (both written and verbal) skills.
  • Experience in the full suite of Mongo, Cassandra and Redis will be highly advantageous.
  • Previous experience in the financial industry preferred.
Responsibilities
  • Install, configure, monitor, upgrade and maintain databases in production and non-production environments, including disaster recovery and patching activity.
  • Responsible for responding to and analysing high severity calls, working to resolution and providing root cause analysis.
  • Planning and implementing proactive measures for reducing the downtime for production environment, as well as capacity management activity and reporting.
  • Database administration for off the shelf and internally developed applications, ensuring continuous 24x7 operation and availability in support of mission critical business applications and participating in on-call rotation.
  • Write and maintain operating system level scripts for database automation and application maintenance.
  • Provide technical expertise and hands-on support in consolidation and migration of databases to new hardware and platforms.
  • Proactive and reactive performance analysis, monitoring, troubleshooting and resolution of escalated Level 2 and Level 3 issues.
  • Work closely with Infrastructure engineering, product development, business operations, and technical operations to ensure delivery of database services within the service level agreements and performance targets.
Desired Qualifications
  • Experience in the financial industry for the role is preferred.
  • Experience with the full Mongo, Cassandra and Redis suite will be highly advantageous.

Visa operates a global digital payments network that connects consumers, businesses, banks, and governments to enable electronic card payments. Its system moves money through a card-based flow: a merchant request, card authorization via Visa, funds settlement between banks, and data processing, with fees earned on transactions and services. The company differentiates itself with its worldwide network, large client base, and partnerships that expand access to digital payments while supporting sustainable commerce. Its goal is to widen financial inclusion and provide convenient, secure electronic payments for a growing share of global commerce.

Company Size

10,001+

Company Stage

N/A

Total Funding

$9.6M

Headquarters

San Francisco, California

Founded

1958

Simplify Jobs

Simplify's Take

What believers are saying

  • Visa Ventures invested in Nekuda's $5M round for agentic payments.
  • Visa Ventures led BVNK's $50M Series B for stablecoin payments.
  • VisaNet handled 164.7 billion transactions annually in 2021.

What critics are saying

  • FedNow bypasses Visa, cutting transaction volume in 12-24 months.
  • PSD2 enables direct payments, causing 70-85% volume loss in 18-36 months.
  • CBDCs in 130+ countries reduce Visa's market by 15-25% in 36-60 months.

What makes Visa unique

  • VisaNet processes 76,000 transactions per second with 99.9999% availability.
  • VisaNet connects 3.6 billion accounts across 200+ countries.
  • VisaNet uses AI for smarter authorization and fraud prevention.

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Benefits

Health Insurance.

Life Insurance.

Dental Insurance.

Disability Insurance.

Accidental Death & Dismemberment Insurance.

Company News

TechCabal
Aug 12th, 2025
HoneyCoin raises $4.9M for expansion

Kenyan fintech HoneyCoin raised $4.9 million in seed funding to expand its stablecoin cross-border payment services into Africa, Latin America, and Asia. Led by Flourish Ventures, the round included TLcom Capital, Stellar Development Foundation, and Visa Ventures. HoneyCoin processes $150 million monthly, serving 350 enterprise clients. The funds will be used to hire executives, secure licenses, and expand into new markets, with plans for new products by Q3 2025.

Business Wire
May 15th, 2025
Nekuda Raises $5M Led by Madrona, Together with Amex Ventures and Visa Ventures, to Power Agentic Payments

Nekuda raises $5M led by Madrona, Amex Ventures & Visa Ventures to power agentic aayments. For the infrastructure of the future of online commerce.

Forbes
May 6th, 2025
Visa Invests in BVNK, $50M Funding

Visa Ventures has invested in stablecoin infrastructure platform BVNK, marking Visa's first direct investment in a stablecoin payments player. This move supports the future of stablecoins in payments, enhancing BVNK's credibility and penetration with Visa's partners. BVNK, which raised $50 million in a Series B round in December 2024, processes $12 billion in annualized volume and offers solutions for B2B and B2C payments using stablecoins.

INACTIVE