Solution Architect (AI-native backend, FinTech) at Unlimit

Belgrade, Serbia

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Not SpecifiedCompensation

Senior (5 to 8 years), Expert & Leadership (9+ years)Experience Level

Full TimeJob Type

UnknownVisa

FinTech, PaymentsIndustries

Requirements

6+ years in architecture roles, ideally in fintech or high-availability distributed systems
Proven experience designing scalable backends in AWS or hybrid cloud environments
Hands-on background in backend development, DevOps, or cloud infrastructure (Java, Go, Python preferred)
Deep understanding of event-driven systems, microservices, CI/CD, observability (Grafana, Prometheus)
Experience with Kubernetes, Terraform, and GitLab CI/CD is strongly preferred
Previous work with AI/ML pipelines, AI agent integration, or MLOps is a strong plus
Experience in financial services, payment gateways, acquiring, or digital wallets is a bonus
Strong stakeholder communication and experience driving system design reviews across teams
Comfortable working in fast-paced, cross-functional environments (LATAM, EU, and APAC teams)

Responsibilities

Take ownership of solution design for backend systems powering payment products (card acquiring, wallets, crypto, BaaS)
Design and maintain architecture that is AI-native and cloud-agnostic, aligned with modern security, scalability, and compliance standards
Partner with product managers, engineering leads, QA, and analysts to translate business needs into modular architectural designs
Build out documentation, high-level solution diagrams, system interface contracts, and component-level specifications
Act as a key contributor to API design and service decomposition efforts
Guide cloud migration and infrastructure evolution (AWS-based stack, with Kubernetes, GitLab CI/CD, Terraform)
Ensure systems enable zero-downtime deployments, automated rollbacks, and scalable horizontal patterns
Conduct architectural reviews, technical assessments, and work closely with delivery teams to implement designs
Act as a thought leader and “tech compass” across engineering functions, driving architectural maturity and platform modernization
Proactively identify technical debt and long-term design risks; propose mitigation strategies

Skills

Solution Architecture

AI Integration

Backend Systems

Payment Processing

Card Acquiring

Banking as a Service

Crypto Solutions

Modular Architecture

Cloud Agnostic

Observability

DevOps

Scalability

Resilience

Unlimit

Provides borderless payment solutions globally

About Unlimit

Unlimit provides borderless payment solutions for businesses aiming to grow locally and globally. The company has developed a large in-house payment infrastructure that allows it to offer a wide range of financial services, including payment acceptance, payment processing, and corporate fund management. Businesses can easily acquire cards, utilize alternative payment methods, and handle international transfers through Unlimit's platform. What sets Unlimit apart from its competitors is its extensive coverage and variety of payment options, including unique local methods tailored to different regions. This enables businesses to confidently enter new markets. Unlimit's goal is to support innovative companies in moving beyond traditional banking technologies, facilitating their expansion and financial management in the evolving fintech landscape.

London, United KingdomHeadquarters

2009Year Founded

VENTURE_UNKNOWNCompany Stage

FintechIndustries

201-500Employees

Benefits

Hybrid Work Options

Paid Vacation

Risks

Increased competition from fintech startups targeting niche markets like the female economy.

Regulatory scrutiny in emerging markets due to DeFi, GameFi, and NFT collaborations.

Challenges in African market expansion due to local regulatory environments.

Differentiation

Unlimit offers the largest in-house developed payment infrastructure globally.

The company provides unique local payment options tailored to specific regions.

Unlimit's borderless payment solutions facilitate seamless international business expansion.

Upsides

Embedded finance growth aligns with Unlimit's BaaS offerings.

Rising digital wallets and contactless payments boost Unlimit's card issuing services.

Cross-border e-commerce growth supports Unlimit's borderless payment solutions.

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