Full Stack · Web3 · iGaming · AI/ML

Building DeFi, games & intelligent platforms.

I'm Oskar — a Senior Full Stack Engineer with 9+ years building scalable web platforms, blockchain & DeFi protocols, real-money casino game systems, and cloud-native AI/ML pipelines.

About me

A bit about me

Over 9+ years I've shipped HTML5 slot games (Pixi.js, certified RNG servers, wallet APIs), blockchain & DeFi protocols (Solidity smart contracts, DEX/AMM, NFTs), full-stack SaaS, and cloud-native AI/ML pipelines. I'm fluent across React, Next.js, Solidity, Django, FastAPI and Node.js — backed by AWS/GCP/Azure DevOps (Kubernetes, Terraform, CI/CD) and production ML with TensorFlow, PyTorch and LangChain.

Always shipping, always learning.

Capabilities

Skills & technologies

Casino & iGaming Development
HTML5 Slot GamesPixi.jsReal-Money Gaming (RMG)RNG IntegrationGLI-19 ComplianceGame Math & RTP ConfigurationWallet API IntegrationIdempotent TransactionsGame Aggregation LayerSoftSwiss-style IntegrationsSpine 2D AnimationTexturePackerWebSocket Real-Time GamingLiveOps & Game AnalyticsResponsible Gaming FeaturesiGaming ArchitectureCertified Game ServerAudit LoggingOperator Back-Office Portal
Blockchain & Web3
SoliditySmart ContractsEVMEthereumSolanaRustHardhatFoundryTruffleethers.jsweb3.jsviemwagmiRainbowKitWalletConnectMetaMaskAccount AbstractionDeFiDEX / AMMUniswapLiquidity PoolsYield FarmingStakingLending ProtocolsERC-20ERC-721ERC-1155NFTsTokenomicsOpenZeppelinChainlinkChainlink VRFThe GraphSubgraphsIPFSArweaveLayer 2OptimismArbitrumPolygonzkSyncCross-Chain BridgesGas OptimizationSmart Contract SecurityAuditsReentrancyMEVOn-Chain Analytics
Frontend Development
ReactNext.jsVue.jsNuxt.jsAngularAngularJSTypeScriptJavaScriptES6SvelteSvelteKitGatsby.jsStorybookReact NativeSwiftIonicTailwind CSSBootstrapAnt DesignMaterial UIPrimeReactSASSSCSSLessCSSHTML5Framer MotionGSAPContext APIReduxReact QueryReact RouterChart.jsD3.jsMapbox GL JSWebpackViteResponsive DesignWCAG 2.0SEOVanilla JavaScriptjQuery
Programming Languages
PythonTypeScriptJavaScriptJavaC#C++CPHPGolangGoRubyRustScalaSQLPerlFORTRANPySpark
Backend Development
FastAPIDjangoDjango REST FrameworkFlaskNode.jsExpressNestJSSpring BootASP.NET Core Web APILaravelRuby on RailsGraphQLApollo GraphQLREST APIsMicroservices ArchitectureWebSocketWebRTCOpenAPISwaggerPydanticSQLAlchemyTypeORMSequelize ORMPrismaJWTOAuth2tRPCJ2EEServletsSOAPXMLMVCMVVMNginxRabbitMQMQTT
AI/ML & LLMs
Pandasscikit-learnTensorFlowPyTorchJAXKubeflowMLOpsAIOpsLLMsOpenAI GPT-4Claude 3LangChainLangGraphRAG (Retrieval Augmented Generation)Multi-Agent SystemsPrompt EngineeringVector DatabasesPineconeWeaviateChromaHugging FaceEmbeddingsSemantic SearchFeature EngineeringMLlibGitHub CopilotAI Code Generation
Databases
PostgreSQLPostGISMySQLMariaDBSQLiteSQL ServerOracle PL/SQLMongoDBNoSQLCouchDBDynamoDBRedisFirebaseSnowflakeDelta LakeClickHouseRow-level SecurityDatabase Schema DesignQuery Optimization
Cloud Platforms & DevOps
AWSEC2S3RDSLambdaFargateECSEKSEMRKinesisSageMakerAPI GatewayCloudWatchCloudFrontCloudFormationCDKElastic BeanstalkAppSyncCognitoOpenSearchElasticSearchGlueRedshiftAthenaQuickSightPinpointSESSQSSNSIAMDMSAmplifyElasticacheAzureAzure CLIAzure MonitorAzure Data FactoryAzure DatabricksAzure SynapseDynatraceGCPBigQueryCompute EngineCloud StorageCloud SQLAI PlatformDockerKubernetesTerraformAnsibleArgo CDIstioChefSaltCloudflareVercelGitHub ActionsGitLab CIJenkinsCircleCITravis CICI/CDInfrastructure as Code (IaC)boto3
CMS & E-Commerce
PimcoreShopifyWordPressAEMLaravel NovaStripe Payment Integration
Data Processing & Analytics
Apache AirflowApache KafkaApache SparkPySparkAWS GlueAWS Data PipelineETL/ELTData PipelinesDistributed ProcessingTableauGoogle AnalyticsGoogle Tag ManagerSnowflake Zero-Copy Cloning
Messaging & Integration
Apache KafkaRabbitMQTibco JMSAMQActiveMQAmazon SNSAmazon KinesisMQTTHL7FHIRMirth ConnectNCPDP
Testing & Quality
JestMochaChaiCypressPlaywrightPuppeteerEnzymeJasmineWebDriverSeleniumpytestUnittestTest-Driven DevelopmentIntegration TestingE2E TestingClean CodeESLintPrettierTest Coverage (85%+ target)CI/CD Test Automation
Tools & Platforms
GitGitHubGitLabBitbucketNPMYarnPNPMMonorepoDocker ComposeTomcatJBOSSAlgoliaTypesenseDatadogPrometheusGrafanaReToolFigmaSketchAdobe XDConfluenceJiraAPMJSONYAMLScrumAgileSAFeSDLC
Systems & Networking
LinuxUnixWindowsAIXBash ScriptingShell ScriptingTCP/IPDNS ConfigurationSSHNIST StandardsFedRAMP Compliance
The journey

Where I've been

2025 — Present
Senior Full Stack Engineer · Web3, Casino & AI/ML · Freelancer

Independent consultant delivering blockchain & DeFi protocols, HTML5 real-money slot games, and AI-driven analytics for Web3 and iGaming clients on AWS/GCP with Kubernetes and Terraform.

  • Built and audited Solidity smart contracts (ERC-20/721/1155) with Hardhat and Foundry — DEX/AMM pools, staking and vesting — deployed across Ethereum L2s (Arbitrum, Optimism).
  • Shipped Web3 dApp frontends in React with wagmi/viem and WalletConnect — wallet auth, on-chain transactions, and live subgraph data via The Graph.
  • Built HTML5 real-money slot frontends in TypeScript & Pixi.js — reel animations, bonus rounds and WebGL particle effects optimized for mobile.
  • Integrated game clients with certified RNG game servers over REST/WebSocket, keeping all win logic and audit logging server-side per GLI-19.
  • Shipped wallet middleware with idempotent bet/win transactions, Redis sessions and Kafka settlement; deployed on AWS EKS via Argo CD & Terraform.
  • Built an AI player-personalization engine (PyTorch) that lifted session length 18% in A/B tests, plus a LangChain RAG responsible-gaming assistant.
2023 — 2025
Senior Full Stack Engineer · iGaming & Cloud DevOps · IT Labs

Led full-stack and iGaming platform engineering for enterprise clients — HTML5 casino games, operator integration layers, and cloud-native microservices on AWS/GCP with certified RNG backends.

  • Architected an iGaming aggregation layer normalizing bet/win/rollback callbacks from multiple providers into a unified wallet API.
  • Integrated on-chain crypto payments and provably-fair game outcomes using Chainlink VRF and EVM smart contracts for Web3 casino products.
  • Delivered 8 real-money HTML5 slot titles (Pixi.js, Spine 2D) with real-time balance updates for European operators.
  • Built a certified game server (FastAPI/Go) with cryptographically strong RNG, win engine and immutable GLI-19 audit logging.
  • Processed spin/wallet/compliance streams at 50K+ events/min with Kafka & Spark; automated CI/CD on EKS with Istio, Terraform and Argo CD.
2015 — 2018
Full Stack Engineer · customer.io

Architected large-scale document-analysis, e-commerce and SaaS platforms with Python, Django, FastAPI, React and AWS — multi-tenant systems, real-time APIs and distributed NLP/ML pipelines.

  • Built a full-stack authorship-analysis platform (FastAPI, PostgreSQL, SageMaker) processing 500K+ documents/day at 94% accuracy.
  • Developed real-time AI content-detection APIs at sub-200ms latency handling 100K+ requests/day on AWS Lambda.
  • Shipped responsive e-commerce apps (Django, React, Next.js, React Native) reaching 1M+ MAU with a 15% engagement increase.
2011 — 2015
B.S. Computer Science · Hong Kong University of Science and Technology

Computer science fundamentals, software architecture, and systems — the grounding behind nine years of shipping production software.

Selected work

My Projects

Say hello

Let's build something

Have a project in mind? Drop me a line and I'll get back to you.

+48 (732) 081-668
oska.engineer1212@gmail.com
@oskareng1098
Download résumé (PDF)